[Top] [Prev] [Next] [Bottom]

5.2 Global Information Modules

The global information modules (see Table 10) define global parameters for interpreting the data transfer.

The Identification, Internal, External Spatial Reference and Catalog/Directory modules are always required. The following modules are recommended: Catalog/Cross-Reference, Catalog/Spatial Domain, and Spatial Domain. Data Dictionary modules are required as defined in 4.1.3.3.1.

Table 10 - Global module types

Global MODULE TYPE
Identification
Catalog/Directory
Catalog/Cross-Reference
Catalog/Spatial-Domain
Security
Internal Spatial Reference
External Spatial Reference
Registration
Spatial Domain
Data Dictionary/Definition
Data Dictionary/Domain
Data Dictionary/Schema
Transfer Statistics

5.2.1 Identification Module

The Identification module provides identifying information about the content of other data modules in the transfer. At least one Identification module is required for each data transfer. It consists of two mandatory fields: Identification and Conformance (see Table 12).

5.2.1.1 Identification Field.

Except for Module Name, Record ID, Standard Identification, Standard Version, Profile Identification, Profile Version, and Title, all remaining subfields of the Identification field are optional.

5.2.1.2 Conformance Field.

The Conformance field includes object specification subfields, an external spatial reference subfield, a features level subfield, a coding level subfield, and a nongeospatial dimension indicator.

5.2.1.2.1 Object specification subfields.

The object specification subfields specify which object types are included in the transfer and which are not included. Table 11 lists the object types associated with each of the subfields in the Object Specification. The object types are identified by Object Representation Codes. All object specification subfields must be coded either "Y" or "N". A "Y" indicates the presence of one or more of the associated object types. An "N" indicates that none of the associated object types is present, with the following exception. Certain one-dimensional, geometry only vector objects (of type LS, AC, AE, AU, and AB) may be used to construct other objects with topology. An "N" for the geometry subfield indicates that such objects, although present, are used only as building blocks for topologically structured objects. Similarly, an "N" for the with-topology subfield indicates that these objects are not used in topological structures.

5.2.1.2.2 External spatial reference subfield.

The mandatory External Spatial Reference subfield indicates whether one of the three recommended systems, Latitude and Longitude, UTM/UPS, or State Plane Coordinate Systems, has been used in the transfer. The subfield must contain 1 if yes, 2 if no but another projection has been used with a specified relationship to Latitude and Longitude, 3 if the relationship to Latitude and Longitude is unspecified.

5.2.1.2.3 Features level subfield.

The mandatory Features Level subfield indicates the level of conformance to part 2 of this standard. The meaning of each level is as follows:

• Level 1 - The transfer consists only of standard entity and attribute terms listed and defined in part 2.
• Level 2 - The transfer consists only of standard entity and attribute terms listed and defined in part 2 and other terms not listed in part 2. All nonstandard terms have been converted to standard terms if contained in the cross-reference of included terms contained in part 2. Data Dictionary modules are included in the transfer to define nonstandard entity and attribute terms.
• Level 3 - The transfer includes some standard entity and (or) attribute terms listed and defined in part 2 as well as terms for which the authority is not SDTS. The non-SDTS terms may overlap with standard entity and attribute terms and (or) included terms, and any such overlapping terms may be used with non-SDTS definitions. Data Dictionary modules are included in the transfer to define all terms for which SDTS is not the authority.
• Level 4 - The authority for all entity and attribute terms is other than SDTS. Data Dictionary modules are used to define all entity and attribute terms.

5.2.1.2.4 Coding level subfield.

The Coding Level subfield indicates the level the transfer conforms with respect to data encoding as specified in part 3 (uses ISO 8211 file formats) . The meaning of each level is as follows:

• Level 0 - The transfer file set conforms to part 3 (i.e. only ISO 8211 is used to encode module content). (This is the default.)
• Level 1 - The transfer contains an adjunct file containing raster cell data. The adjunct file format is described in the transfer.
• Level 2-5 - Reserved for future use.
• Level 6-9 - May be defined by a profile or within the transfer itself.

5.2.1.2.5 Nongeospatial Dimensions subfield.

If a transfer has a Dimension Definition module that extends the Spatial Addresses beyond geospatial dimensions, then the Nongeospatial Dimensions subfield will be valued with "Y".

Table 11 - Presence or absence of object types by Object Specification

Code	Object Type	Object Specification Subfield
		Composite	Vector geometry only	Vector with topology	Image, Grid, Voxel or some other Raster
FF	Composite	Y	N	N	N
NP	Point	N	Y	N	N
NE	Entity point	N	Y	Y	N
NL	Label point	N	Y	N	N
NA	Area point	N	Y	Y	N
NO	Node, planar	N	N	Y	N
NN	Node, network	N	N	Y	N
LS	String	N	Y	Y	N
LQ	Link	N	N	Y	N
LE	Complete chain	N	N	Y	N
LL	Area chain	N	N	Y	N
LW	Network chain	N	N	Y	N
LY	Network chain	N	N	Y	N
AC	Arc	N	Y	Y	N
AE	Arc	N	Y	Y	N
AU	Arc	N	Y	Y	N
AB	Arc	N	Y	Y	N
RM	Ring, mixed	N	Y	N	N
RS	Ring, strings	N	Y	N	N
RU	Ring, chains	N	N	Y	N
RA	Ring, arcs	N	Y	N	N
PG	G-polygon	N	Y	N	N
PR	GT-polygon	N	N	Y	N
PC	GT-polygon	N	N	Y	N
PU	Universe polygon	N	N	Y	N
PW	Universe polygon	N	N	Y	N
PV	Void polygon	N	N	Y	N
PX	Void polygon	N	N	Y	N
G2	Raster object	N	N	N	Y
G3	Raster object	N	N	N	Y
GV	Raster object	N	N	N	Y

Table 12 - Identification module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Identification (P) [M]						IDEN
	Module Name [M]	A unique name for this Identification module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID[M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Standard Identification [M]	A title for the standard to which this transfer conforms.	A	Alphanum	SPATIAL DATA TRANSFER STANDARD	STID
	Standard Version [M]	Version of the standard to which this transfer conforms.	A	Alphanum	Value of version number.	STVS
	Standard Documentation Reference	Reference to specific published documentation for the standard.	A	Gr-chars	This standards number and date.	DOCU
	Profile Identification [M]	A title for the profile to which this transfer conforms.	A	Alphanum	Alphanumeric title of profile, or "none" if transfer does not conform to a profile.	PRID
	Profile Version [M]	Version of the profile to which this transfer conforms.	A	Alphanum	Version, date, and Standard or proposed Standard information; or "none".	PRVS
	Profile Documentation Reference	Reference to specific published documentation for the profile, including publisher or source of documentation.	A	Gr-chars	Any combination of graphics characters.	PDOC
	Title [M]	An overall title or name applied to all data content of the data transfer.	A	Gr-chars	Any combination of graphics characters.	TITL
	Data ID	A user-defined data set identifier, usually unique to the data producer.	A	Gr-chars	Any combination of graphics characters.	DAID
	Data Structure	A description of the internal data structure, organization, or other properties of the data relating only to the digital representation rather than, and independent of, the actual "analog" data represented.	A	Gr-chars	Any combination of graphics characters.	DAST
	Map Date	A date specifying the temporal extent of the data.This date must apply to the actual real-world information represented by the data, and not to data collection or any other processing history.	A	cs: FIPSPUB4	FIPSPUB 4 specified date (day or month-day may be omitted).	MPDT
	Data Set Creation Date	A date specifying when the data were created (a processing history date "stamp" on the data set rather than on the information represented).	A	cs: FIPSPUB4	FIPSPUB 4 specified date (day or month-day may be omitted).	DCDT
	Scale	A scale denominator at which the data may be referenced in a "paper-map" sense. If the data were collected from a graphic map, or meant to be displayed graphically, this subfield would indicate the scale of the map/display.	I	Numeric	A valid numeric scale denominator.	SCAL
	Comment	Additional comments.	A	Gr-chars	Any combination of graphics characters.	COMT
Conformance (N)[M]		See 5.2.1.2 for details.				CONF
	Composites [M]	Transfer contains at least one composite object.	A	Y N	Yes No	FFYN
	Vector Geometry [M]	Transfer contains vector objects used for geometry only operations.	A	Y N	Yes No	VGYN
	Vector Topology [M]	Transfer contains vector objects with topological relationships included.	A	Y N	Yes No	GTYN
	Raster [M]	Transfer contains raster-- image and (or) grid-- objects.	A	Y N	Yes No	RCYN
	External Spatial Reference [M]	Specifies whether one of the three recommended coordinate systems (Latitude and Longitude, UTM/UPS, or State Plane Coordinates) has been used as the External Spatial Reference system.	I	1	Yes - one of three.	EXSP
				2	Other projection used.
				3	Projection unspecified.
				0 := NULL	Undefined, not relevant. For use only in transfers not containing any spatial data.
	Features Level [M]	Specifies the level of conformance to the lists and definitions of entity and attribute terms in part 2.	I	1 2 3 4	All SDTS Mixed, non-overlapping Mixed, overlapping All non-SDTS	FTLV
	(d)Coding Level	Specifies the level of conformance to the part 3 encoding. Default is zero meaning only part 3 encoding used in a transfer file set.	I	0	The transfer file set encoded using part3	CDLV
				1	The transfer has an adjunct file for raster cell data
				2 through 5	Reserved for future use
				6 through 9	Meaning defined by profile or within the transfer.
	(d)Nongeospatial Dimensions	Transfer contains vector or raster objects whose spatial addresses extend into nongeospatial dimensions. Default is N.	A	Y N	Yes No	NGDM
(^)Attribute ID(R)		Foreign identifier for Attribute Primary module record. Attribute data referenced are global.				ATID
(continued)

5.2.2 Catalog Modules

The Catalog module specification describes three types of modules:

a) Catalog/Directory, containing information on the location of modules within the transfer.

b) Catalog/Cross-Reference, indicating pairwise relationships between modules.

c) Catalog/Spatial Domain, specifying the relationships between modules, spatial domain, maps, themes, and aggregate objects.

The catalog defines the contents of the transfer in terms of the included modules, specifies how to access individual modules, and specifies relationships between modules. It also relates modules to spatial domains. It therefore describes the physical, logical, and spatial organization of the transfer at the module level. The three catalog modules are relational modules with one primary module field per module record. Many-to-one and one-to-many relationships are expressed with multiple module records, in which the single item is repeated from record to record (one to one relationships may also be expressed by limiting the number of Catalog modules used within a given transfer to one, or to one of each of the three types). Wildcard rules as described in 4.1.3.4.5 may be applied for the purpose of eliminating multiple records, as indicated in the module domain description tables. See examples in annex D.

5.2.2.1 Catalog/Directory Module.

This module contains information on where to locate all modules within the transfer (see Table 13). It is also used to locate adjunct files which constiute part of the transfer. An adjunct file contains data that constitues part of the transfer, however, the file format is based on a standard other than Part 3/ISO 8211. (The use of adjunct files is permitted only as defined by an SDTS profile.) In other module records, modules are referenced by module name, and adjunct files are referenced by an adjunct file identifier. In the Catalog/Directory module these logical names are mapped to physical file names.

The Catalog/Directory module is required in a transfer. It must contain records to describe all modules (internal to the transfer and external) and adjunct files that constitute a complete spatial data transfer.

5.2.2.2 Catalog/Cross-Reference Module.

This module contains the linkages for modules in the transfer. These linkages can be many-to-one, one-to-many, or one-to-one. For example, for global modules, the linkage may be one-to-one or one-to-many. For the one-to-many and many-to-one linkages, multiple module records for a given module must be present. Alternatively, one-to-many can in some cases be handled by a single module record with a wildcard reference. (see Table 14).

5.2.2.3 Catalog/Spatial Domain Module.

This module defines the relations between a particular module and a spatial domain, map, theme, or aggregate object (see Table 15).

5.2.3 Security Module

The Security module provides information on the security, confidentiality, or copyrights that might effect distribution and use of the data in a transfer. Information on security may be carried at different levels of aggregation. Thus, information on security may refer to a domain, map, theme, or an individual spatial object. (see Table 16).

Table 13 - Catalog/directory module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Catalog/Directory (P)[M]						CATD
	Module Name [M]	A unique identifier for this Catalog/Directory module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Name [M]	The unique value in the Module Name subfield of the module referenced; or an adjunct file identifier.	A	Alphanum	Name must begin with alphabetic character.	NAME
	Type [M]	The transfer module primary field name of "Name" above; or type indicating adjunct file.	A	primary field name	Must be a valid module primary module field name.	TYPE
				Gr-chars	Value identified by profile; must indicate file format.
	Volume	The volume on which a part or all of the module is to be found.	A	Gr-chars	Valid volume descriptor, wildcard characters may be used.	VOLM
	File	The file on which a part or all of the module (or adjunct file) is found.	A	Gr-chars	Valid file name, wildcard characters may be used.	FILE
	Record	The record on which a part or all of the module is to be found (implementation record).	I|A	Integer Gr-chars	Unsigned integer, wildcard characters maybe used.	RECD
	(d)External	The module is external to this transfer data set. Default is N.	A	Y N A	Yes - Module not included. No - Module is included. Adjunct File included.	EXTR
	Module Version [M/External=Y]	Version of the module referenced by, or included in, this transfer data set.	A	Gr-chars	Valid version designator.	MVER
	Comment	Any other information.	A	Gr-chars	Any combination of graphics characters.	COMT

Table 14 - Catalog/Cross-Reference module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Catalog/Cross-Reference(P) [M]						CATX
	Module Name [M]	A unique identifier for this Catalog/Cross-Reference module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer, with Module Name must form unique ID within file set.	RCID
	Name 1 [M]	The unique value in the Module Name subfield of the module referenced.	A	Alphanum	Name must be name of a module in the transfer.	NAM1
	Type 1	The transfer module primary field name of "Name 1" above.	A	Gr-chars	Must be a valid module primary field name.	TYP1
	Name 2 [M]	The unique value in the Module Name subfield of the module referenced.	A	Gr-chars	Name must be name of a module in the transfer, wildcard characters may be used.	NAM2
	Type 2	The transfer module primary field name of "Name 2" above.	A	Gr-chars	Must be a valid module primary module field name.	TYP2
	Comment	Any other information.	A	Gr-chars	Any combination of graphics characters.	COMT

Table 15 - Catalog/Spatial Domain module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Catalog/Spatial Domain(P) [M]						CATS
	Module Name [M]	A unique identifier for this Catalog/Spatial Domain module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer, with Module Name must form unique ID within the file set.	RCID
	Name	The unique value in the Module Name subfield of a module referenced.	A	Alphanum	Name must begin with an alphabetic character.	NAME
	Type	The transfer module primary field name of "Name" above.	A	Gr-chars	Must be a valid module primary field name.	TYPE
	Domain [O/Map|Theme| Aggregate Object]	Area of geographic coverage referenced by this module.	A	Gr-chars	Any combination of graphics characters; wildcard characters may be used and are always taken as wildcards.	DOMN
	Map [O/Domain|Theme|Aggregate Object]	Map coverage name within geographic coverage referenced by this module.	A	Gr-chars	Any combination of graphic characters; wildcard characters may be used and are always taken as wildbards.	MAP
	Theme [O/Domain|Map| Aggregate Object]	Theme referenced by this module.	A	Gr-chars	Any combination of graphics characters; wildcard characters may be used and are always taken as wildcards.	THEM
	Aggregate Object [O/Domain| Map| Theme]	Aggregate spatial object referenced by this module.	A	Gr-chars	Any combination of graphics characters; wildcard characters may be used and are always taken as wildcards.	AGOB
	Aggregate Object Type [M/Aggregate Object]	Type of aggregate spatial object referenced, such as Graph or Raster.	A	GP GT GN G2 G3 GV Gr- chars	Planar graph 2-D manifold Network graph Grid or Image (2-d raster) Voxel Space (3-d raster) Rectangle Variant Grid Other as defined by profile	AGTP
	Comment	Any other information.	A	Gr-chars	Any combination of graphics characters.	COMT
(continued)

Table 16 - Security module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Security (P)[M]						SCUR
	Module Name [M]	A unique name for this Security module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Security Class [M]	Security classification level.	A	TOPSEC SECRET CONFID RESTRC UNCLAS COPYRI Gr-chars	Top Secret Secret Confidential Restricted Unclassified Copyrighted Other as defined by profile	CLAS
	Control	Instructions for distribution and handling of the data concerning security or copyrights.	A	Gr-chars	Any combination of graphics characters.	CTRL
	Release Instructions	Instruction on release restrictions.	A	Gr-chars	Any combination of graphic characters.	RLIS
	Review Date	Reclassification date	A	cs:FIPSPUB4	FIPSPUB 4 specified date.	RVDT
	Review Instructions	Reclassification instructions.	A	Gr-chars	Any combination of graphics characters.	RVIS
	Comment	Additional comments	A	Gr-chars	Any combination of graphics characters.	COMT
(^)Foreign ID (R)		Reference to a specific module record.				FRID

5.2.4 Spatial Reference Modules

The spatial reference in a spatial data transfer is defined through the use of the following transfer modules:

	Internal Spatial Reference
	External Spatial Reference
	Registration
	Dimension Definition

The internal (to the transfer) coordinate system can be related to geographic coordinates through the use of the Internal and External Spatial Reference modules. The Internal Spatial Reference module provides a mechanism for the sender to explicitly define the translation and scaling of the geospatial dimensions of the internal coordinate system to the system defined in the External Spatial Reference module. The Registration Module provides a mechanism to implicitly specify the transformation from the internal to the external system.

Any non-geospatial dimension of the internal coordinate system, defined through the Dimension Definition module, does not have transformation parameters. When the internal reference system is transformed to the external reference system, the values for the nongeospatial dimensions will appear as they are found in the internal reference system.

5.2.4.1 Internal Spatial Reference Module.

The transformation parameters described in the Internal Spatial Reference module record provide for a simple translation and scaling from the internal reference system to the external reference system. Three scale factors and a translation vector that is the origin of the external spatial reference system provide the independent scaling and translation of the geospatial dimensions of the internal coordinates to external coordinates (see Table 17).

The following matrix equation must be specified:

	|X|		|SX	0	 0  |	|X'|		|Xo|
	|Y|	=	|0	SY	 0  |	|Y'|	+	|Yo|
	|Z|		|0	0	SZ|	|Z'|		|Zo|
	where:

• X,Y,Z = geospatial components of spatial address in the external system
• SX,SY,SZ = geospatial scaling factors for scaling to the external system, forming the diagonal elements of a diagonal matrix with off-diagonal zero elements
• X',Y',Z' = geospatial components of spatial address in internal system
• Xo,Yo,Zo = geospatial components of spatial address of origin of internal system in external system

If the external reference system is the State Plane coordinate system and the internal system uses units of feet, the feet to meters conversion factor of 0.3048 must be used in computing scaling factors.

An alternative method for converting from internal to external coordinates is provided by registration points in the Registration module.

The subfields containing the scaling factors and the origin of the external system are optional only if registration points are used. Otherwise, the subfields are mandatory and must not be null. If no transformation is required, then the identity transformation must be indicated by scaling factors of 1.0 and components of the origin of 0.0.

5.2.4.2 External Spatial Reference Module.

This module is used to define the external spatial reference system and its relationship to latitude and longitude (see 4.1.3.5). The external spatial referencing systems supported by the standard and to be used under conformance level 1 are Latitude-Longitude (GEO), Universal Transverse Mercator/Universal Polar Stereographic (UTM/UPS), and State Plane Coordinate Systems--metric (SPCS). The system being used is indicated by one of the codes (GEO, UTM/UPS, or SPCS) in the Reference System Name subfield (see Table 18).

For conformance level 2, the Reference System Name subfield must contain OTHR, meaning that another reference system is used. In this case, the system and its projection must be fully described in the Projection subfield, the associated parameters for conversion to latitude and longitude must be fully defined in Data Dictionary modules, and parameter values must be provided as attributes referenced by the Attribute ID field. A full description of the system used must be provided in the Lineage portion of the Quality Report as well.

For conformance level 3, the Reference System Name subfield must contain UNSP, meaning that the relationship of the spatial addresses to geographic coordinates is not specified, and this fact must also be documented in the Lineage portion of the Quality Report.

Additional dimensions defined in the Internal Spatial Reference module are also implicitly defined in the external spatial reference system. Any metadata, such as units, format, and description, are found in the Dimension Definition module. The external spatial reference system will have one dimension for each geospatial dimension plus one dimension for each Dimension ID field defined in the Internal Spatial Reference module.

Altitude and depth measurements can be encoded as Z-values in spatial addresses or alternatively as attribute values or cell values. The Vertical Attribute field and the Sounding Attribute field should be used when attribute and/or cell values are used for encoding vertical or depth measurements, respectively.

5.2.4.3 Registration Module

Registration points may be used to express the relationship between the internal spatial reference system and the external spatial reference system (see Table 19).

The Registration Module is highly recommended for External Spatial Reference conformance level of 2. (Also, indicated in the External Spatial Reference module by having a Reference System Name of "OTHR".)

5.2.4.4 Dimension Definition Module

The Dimension Definition module is used for data sets which contain nongeospatial dimensions. This allows N-dimensional data with spatial registration to be encoded in this standard. Each record provides dimension information: data type, resolution, units, etc. Each Dimension Definition record may be referenced by one or more Internal Spatial Reference records.

The main components of the Dimension Definition module are (see Table 20):

a) A primary field which contains a text label, the format of the values used for indexing along the axis, and resolution information.

b) An Attribute ID field used for assigning attributes to the dimension being described.

The records of the Dimension Definition module will modify any Spatial Addresses which happen to fall within the scope of the definition. This scope is defined by the Internal Reference System module record which references one or more records of the Dimension Definition module.

Table 17 - Internal Spatial Reference module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Internal Spatial Reference (P)[M]						IREF
	Module Name [M]	Unique name for this Internal Spatial Reference module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Comment	Free-form comment subfield.	A	Gr-chars	Any combination of graphics characters.	COMT
Note: the following subfields provide information for the type of spatial address used.
	Spatial Address Type [M]	Indicates whether horizontal component only or both horizontal and vertical components are present in the spatial address.	A	2-TUPLE	Horizontal component only (i.e. x,y).	SATP
				3-TUPLE	Horizontal component and a vertical component. (i.e. x,y,z).
	Spatial Address X Component Label [M]	Indicates the correspondence of internal and external spatial address X components to either one of the horizontal components of the external spatial reference system.	A	LATITUDE LONGITUDE	For use with geographic coordinates. When Latitude is selected for X, then Longitude must be selected for the following Y subfield.	XLBL
				EASTING NORTHING	For use with State Plane or UTM/UPS systems. When Easting is selected for X, then Northing must be selected for the following Y subfield.
				Gr-chars	May be used with External Spatial Reference Conformance level 2 or level 3.
	Spatial Address Y Component Label [M]	Indicates the correspondence of internal and external spatial address Y components to either one of the horizontal components of the external spatial reference system.	A	LATITUDE LONGITUDE	For use with geographic coordinates. When Latitude is selected for Y, then Longitude must be selected for the previous X subfield.	YLBL
				EASTING NORTHING	For use with State Plane or UTM/UPS systems. When Easting is selected for Y, then Northing must be selected for the previous X subfield.
				Gr-chars	May be used with External Spatial Reference Conformance level 2 or level 3.
	Horizontal Component Format [M]	Specific format of the horizontal components of the spatial address.	A	I R S BI8 BI16 BI24 BI32 BUI BUI8 BUI16 BUI24 BUI32 BFP32 BFP64	Implicit-point integer Explicit-point unscaled Explicit-point scaled 8-bit signed integer 16-bit signed integer 24-bit signed integer 32-bit signed integer Unsigned integer 8-bit unsigned integer 16-bit unsigned integer 24-bit unsigned integer 32-bit unsigned integer 32-bit floating point real 64-bit floating point real	HFMT
	Vertical Component Format [M/Spatial Address Type = 3-TUPLE]	Specific format of the vertical components of the spatial address.	A	I R S BI8 BI16 BI24 BI32 BUI BUI8 BUI16 BUI24 BUI32 BFP32 BFP64	Implicit-point integer Explicit-point unscaled Explicit-point scaled 8-bit signed integer 16-bit signed integer 24-bit signed integer 32-bit signed integer Unsigned integer 8-bit unsigned integer 16-bit unsigned integer 24-bit unsigned integer 32-bit unsigned integer 32-bit floating point real 64-bit floating point real	VFMT
Note: the following subfields are used to specify the scaling matrix and translation vector. The off-diagonal elements of the scaling matrix are always zero, and are therefore not transferred.
	Scale Factor X [O/Registration]	Scaling factor for the X axis.	R	Real	Any real number.	SFAX
	Scale Factor Y [O/Registration]	Scaling factor for the Y axis.	R	Real	Any real number.	SFAY
	Scale Factor Z [M/Spatial Address Type = 3-TUPLE]	Scaling factor for the Z axis.	R	Real	Any real number.	SFAZ
	X Origin [O/Registration]	X component of origin spatial address in external system.	R	Real	Expressed in degrees for geographics, in meters for State Plane or UTM/UPS.	XORG
	Y Origin [O/Registration]	Y component of origin spatial address in external system.	R	Real	Expressed in degrees for geographics, in meters for State Plane or UTM/UPS.	YORG
	Z Origin [M/Spatial Address Type = 3-TUPLE]	Z component of origin spatial address in external system.	R	Real	Expressed in meters for geographics, State Plane, or UTM/UPS.	ZORG
Note: the following subfields specify the resolution components for the spatial address, where resolution is defined as the minimum difference between two independently measured or computed coordinate values that can be distinguished by the measurement or analytical method used.
	X Component of Horizontal Resolution	X component of horizontal coordinate resolution.	R	Real	Expressed in meters for geographics, State Plane, or UTM/UPS.	XHRS
	Y Component of Horizontal Resolution	Y component of horizontal coordinate resolution.	R	Real	Expressed in meters for geographics, State Plane, or UTM/UPS.	YHRS
	Vertical Resolution Component [M/Spatial Address Type = 3-TUPLE]	Vertical component of coordinate resolution.	R	Real	Expressed in meters for geographics, State Plane or UTM/UPS.	VRES
(^) Dimension Id (O)		A pointer to the Dimension Definition records which define the nongeospatial dimensions of the Spatial Address. The order of repetition of this field determines the order subfields are placed in the Spatial Address field.				DMID

Table 18 - External spatial reference module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
External Spatial Reference (P)[M]						XREF
	Module Name [M]	A unique name for this External Spatial Reference module.	A	Alphanum	Names must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Comment	Free-form comment subfield	A	Gr-chars	Any combination of graphics characters.	COMT
	Reference Documentation	Reference in which the external system used is documented.	A	Gr-chars	Any combination of graphics characters.	RDOC
	Reference System Name [M]	Name for the external system used	A	GEO	Geographics (latitude and longitude).	RSNM
				SPCS	State Plane Coordinate System - meters.
				UTM	UTM - meters.
				UPS	UPS - meters.
				OTHR	Other - Described in Projection subfield.
				UNSP	Unspecified.
	Vertical Datum [X/Spatial Address Type = 2-TUPLE|Sounding Datum]	Reference surface for the third component of the internal spatial addresses (not used for hydrographic depths).	A	NGVD	National Geodetic Vertical Datum of 1929.	VDAT
				NAVD	North American Vertical Datum of 1988.
				GEODETIC	All altitudes are referenced to the ellipsoid of the specified datum.
				Gr-Char.	Any other geodetic datum.
	Sounding Datum [X/Spatial AddressType = 2-TUPLE|Vertical Datum]	Reference datum for the third component of the internal spatial addresses (for hydrographic depths only).	A	MHW MHWN MHWS MHHW MLW MLWN MLWS MLLW	Mean High Water Mean High Water Neaps Mean High Water Springs Mean Higher High Water Mean Low Water Mean Low Water Neaps Mean Low Water Springs Mean Lower Low Water	SDAT
	Horizontal Datum [M/EXSP=1|2]	Geodetic datum to which the internal spatial addresses have been referenced.	A	NAS NAX WGA WGB WGC WGE Gr-chars	North American 1927 North American 1983 World Geodetic System 1960 World Geodetic System 1966 World Geodetic System 1972 World Geodetic System 1984 Any other geodetic datum	HDAT
	Zone Number [M/Reference System Name = SPCS|UTM|UPS]	UTM/UPS/State Plane Zone number.	A	Gr-chars	Valid UTM/UPS/State Plane zone number (see 1.3.21 and annex C).	ZONE
	Projection [M/Reference System Name = OTHR]	Name and (or) description of the projection and reference system used.	A	Gr-chars	Any combination of graphics characters.	PROJ
(^)Attribute ID (N) [M/ReferenceSystemName = OTHR]		Foreign identifier for Attribute Primary module record containing projection parameters.				ATID
Vertical Attributes (R)		The Vertical Attributes field is used for any attribute or raster layer which require a vertical datum. This field can repeat for each layer or each attribute needing a vertical datum.				VATT
	Vertical Datum [M]	Reference surface for vertical measurements like elevation or altitude.	A	(same as subfield VDAT above)		VDAT
	Vertical Encoding Method [M]	The method used to encode vertical measurements (except for the use of Z-component of spatial address)	A	ATT CELL	As Attribute Values As Cell Values	VEM
	Attribute Label [M]	Name of attribute subfield whose values carry vertical measurements.	A	Gr-chars	Attribute subfield name as in the Attribute Primary, Attribute Secondary, or Cell modules.	ATLB
	Attribute Authority [M]	Name of the attribute authority for Label field above.	A	Gr-chars	Any combination of at most eight characters.	AUTH
Sounding Attributes (R)		The Sounding Attributes field is used for any attribute or raster layer which require a sounding datum. This field can repeat for each layer or each attribute needing a sounding datum.				SATT
	Sounding Datum [M]	Reference datum for hydrographic depths.	A	(same as subfield SDAT above)		SDAT
	Sounding Encoding Method [M]	The method used to encode depth measurements (except for the use of Z-component of spatial addresses)	A	ATT CELL	As Attribute Values As Cell Values	SEM
	Attribute Label [M]	Name of attribute subfield whose values carry hydrographic depth measurements.	A	Gr-chars	Attribute subfield name as in the Attribute Primary, Attribute Secondary, or Cell modules.	ATLB
	Attribute Authority [M]	Name of the attribute authority for subfield label above.	A	Gr-chars	Any combination of at most eight characters.	AUTH

Table 19 - Registration module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Registration (P) [M]						RGIS
	Module Name [M]	A unique name for this Registration module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Comment	Free-form comment subfield.	A	Gr-chars	Any combination of graphics characters.	COMT
(-)External Reference Spatial Address (O/A) [M]					.	EADS
(-)Internal Reference Spatial Address (O/A) [M]						IADS

Table 20 - Dimension definition module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Dimension Definition (P)[M]		One dimension definition record will describe one nongeospatial dimension.				DMDF
	Module Name [M]	A unique identifier for the module.	A	Alphanum	Name must begin with alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Dimension Label [M]	Label describing this dimension of the space. This label will be found in the SADR as the mnemonic for the subfield containing values along this dimension.	A	Gr-chars	Any combination of graphics characters.	DMLB
	Dimension Component Format [M]	Format for this dimension's resolution or for this dimension's index labels. This also provides the format for SADR subfield which corresponds to this record. The format for the values is found along this dimension's axis. The subfield of the Spatial Address which corresponds to this dimension will have the format specified by this subfield.	A	I R S BI8 BI16 BI24 BI32 BUI BUI8 BUI16 BUI24 BUI32 BFP32 BFP64 C A	Implicit-point (integer) Explicit-point, unscaled Explicit-point, scaled 8-bit signed integer 16-bit signed integer 24-bit signed integer 32-bit signed integer Unsigned integer 8-bit unsigned integer 16-bit unsigned integer 24-bit unsigned integer 32-bit unsigned integer 32-bit floating point real 64-bit floating point real Character mode bitfield Alphanumeric	DFMT
	Dimension Component of Resolution [M]	Defines the resolution of data stored along this axis.	I|R|S|C|B	Integer Real Binary	As defined by the DFMT subfield	DRES
	Dimension Value Measurement Unit [M]	Measurement unit for the values of this dimension.	A	Gr-chars	Any combination of graphics characters.	DDMU
	Dimension Description	A brief description of the dimension.	A	Gr-Chars	Any combination of graphics characters.	DDES
(^)Dimension Attribute ID (R)		Foreign identifier for Attribute Primary module record. Attributes pertain to a specific dimension.				DATP
(continued)

5.2.5 Spatial Domain Module

The Spatial Domain module (see Table 21) specifies a geographic areal domain within which the spatial addresses of other modules are contained. Two basic methods of specifying this coverage are allowed in this module:

a) By specifying a spatial address with all minimum value components and a spatial address with all maximum value components (in most cases, the southwest (or lower left) and northeast (or upper right) corners of a coverage rectangle); and (or)

b) By a series of spatial addresses describing a ring delineating the area.

Two types of spatial addresses may be used:

a) "Internal" spatial addresses as fully defined by parameters of the Internal Spatial Reference module; and

b) "External" spatial addresses as fully defined by parameters of the External Spatial Reference module.

Any number of Spatial Domain module records may be used to specify spatial domain for the same set of data (if more than one way of specifying spatial domain is desired).

5.2.6 Data Dictionary Modules

The Data Dictionary specification describes three types of modules:

a) Data Dictionary/Definition

b) Data Dictionary/Domain

c) Data Dictionary/Schema

The purpose for the data dictionary is to convey the meaning of entities and attributes, the relationship between entities and attributes, the relationship between attributes and value domains, and the relationship between attributes as they make up relational tables. Cell Values of the Cell module are defined by the data dictionary in the same manner as attributes.

Data Dictionary modules must be used to fully describe attributes and entities for which the attribute and (or) entity authority subfields of the Data Dictionary/Schema primary field are null. In this case, there is no preestablished authority, so that attribute meaning must be defined within the spatial data transfer itself.

The Data Dictionary/Definition module must also provide a full description of the attribute and (or) entity authority, when an authority other than the standard is referenced in the Data Dictionary/Schema subfields. In this case, the referenced definitions must be available in the form of a standard Data Dictionary/Definition module. Wildcard characters may be used in the Entity/Attribute Label field, indicating that the authority applies to a collection of attributes defined in an authority document not included in the transfer. The applicable wildcard rules are those specified in 4.1.3.4.5

Data Dictionary/Domain modules must accompany Data Dictionary/Definition modules except where domain and value definitions are available from the attribute authority as noted above. A separate Data Dictionary/Domain module must also be provided, where necessary, for the purpose of defining values of standard subfields where the domain type "dd:" is specified (case (i) in 4.2.1, Specification Layout). Such a module must (a) contain no corresponding Data Dictionary/Definition or Data Dictionary/Schema module, (b) contain a concatenations, separated by a slash "/", of the field and subfield mnemonics (e.g., AFIL/HIDX for Area Fill Representation/Hatch Index) for which definitions are provided, in the Attribute Label subfield, and (d) be referenced in a corresponding Catalog/Cross Reference module which associates the Data Dictionary/Domain module with the module(s) for which subfield value definitions are provided.

The three data dictionary modules are relational modules with one primary module field per module record. For examples of the use of data dictionary modules, consult Annex C.

If the authority for an attribute is another FIPS standard, the Attribute Domain Type subfield of the Data Dictionary/Domain module must contain the keyword FIPSCODE (see 5.2.6.2) with the number of the applicable FIPSPUB cited in the Attribute Authority Description subfield of Data Dictionary/Definition module (see 5.2.6.1).

5.2.6.1 Data Dictionary/Definition Module.

This module contains definitions for entities and entity attributes and raster layers. It also specifies the name of the relevant authority and provides a full description of this authority. This module is a relational module, thus any one-to-many relationships between entities or attributes and definition, source, and authority must be expressed using multiple module records (see Table 22).

5.2.6.2 . Data Dictionary/Domain Module.

This module is used to specify attributes and their associated value domains. It is also used to provide descriptions and definitions for user-defined attribute values. The module is a relational module with one primary field, so that the one-to-many relationship between an attribute and the values of its associated domain must be expressed through the use of multiple module records (see Table 23). The domain types specified in this module are exactly the same as those specified for use in the transfer module specification layout (see 4.2.1). Special values of a domain, such as may be the case with an enumerated domain or with the specification of user null conventions, must be defined using this module. The module serves to attach domain value definitions to domain values. Values must always be defined, in one of three ways: (a) by specifying a measurement unit in the Attribute Domain Value Measurement Unit subfield, (b) by providing a definition in the Domain Value Definition subfield; or (c) by providing a reference to a published source of definitions of value terms used in the Attribute Authority Description subfield of the corresponding Data Dictionary/Definition module record for the attribute.

This module is also used to specify the complete domain for subfields for which the domain is only partially defined in the standard. These are identified in the module description tables by a notation of dd: in the domain column. See 4.2.1.

5.2.6.3 Data Dictionary/Schema Module.

The primary function of this module is to describe the specific composition of the Attribute Primary, Attribute Secondary and Cell modules, and to relate the attributes in the attribute modules to the corresponding entities according to the entity-attribute model specified in 2.1.1 and in part 2, section 2 (see Table 24). A secondary function is to provide additional information about the entity and attributes, such as authority, format, measurement unit, and subfield length. The module also contains a subfield indicating whether an attribute is a part of a relational primary or foreign key so as to preserve a relational attribute model. For an additional explanation of the relationships between this and the Attribute Primary and Attribute Secondary see 4.1.3.6.1.

5.2.7 Transfer Statistics Module

This module is used to provide a transfer recipient with data volume information at various levels. For this purpose, the module consists of a table of module names, total module record counts, and total spatial address counts (see Table 25).

Table 21 - Spatial domain module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Spatial Domain (P) [M]						SPDM
	Module Name [M]	Unique name for this Spatial Domain module	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Spatial Domain Type [M]	Method of specifying the domain spatial addresses.	A	MINMAX	Spatial domain is specified by two spatial addresses. The first containing the minimum value associated with each component; the second containing the maximum value associated with each component.	DTYP
				RING	Spatial domain is specified by a series of spatial addresses forming a ring boundary.
	Domain Spatial Address Type [M]	System employed to specify the domain spatial addresses.	A	INTERNAL	Internal spatial addresses are used.	DSTP
				EXTERNAL	Spatial addresses are in the form defined in the external spatial reference module.
	Comment	Free-form comment subfield.	A	Gr-chars	Any combination of graphics characters.	COMT
(-)Domain Spatial Address (O) [M]		Spatial address of spatial domain boundary vertex. The ordering required for the instances of the field relates to the proper sequence of the vertices for describing the boundary.			When the Domain Spatial Address Type is EXTERNAL, the formats of the geospatial subfields, X, Y, and Z, will be (I or R).	DMSA

Table 22 - Data dictionary/definitionmodule specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Data Dictionary/ Definition (P) [M]						DDDF
	Module Name [M]	Unique name for the Data Dictionary/Definition module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Entity or Attribute [M]	Indicates whether the module record contains an entity or attribute definition.	A	ENT	Definition is for entity.	EORA
				ATT	Definition is for attribute or cell value.
	Entity/Attribute Label [M]	Entity or attribute label.	A	Gr-chars	Any combination of graphics characters; wildcard characters may be used and are always taken as wildcards.	EALB
	Source	Source for the definition.	A	Gr-chars	Any combination of graphics characters.	SRCE
	Definition [M]	Definition of the attribute or entity denoted by the contents of the Entity/Attribute subfield.	A	Gr-chars	Any combination of graphics characters.	DFIN
	Attribute Authority [M]	Name of the attribute (or entity) authority. If the authority is another FIPS standard, specify FIPS in this subfield, and give a full reference in the ADSC subfield.	A	FIPS	Authority is a FIPS.	AUTH
				Gr-chars	Any combination of at most eight graphics characters.
	Attribute Authority Description [M/ADSC=FIPS]	Full description of the attribute (or entity) authority.	A	Gr-chars	Any combination of graphics characters.	ADSC

Table 23 - Data dictionary/domain module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Data Dictionary/Domain (P)[M]						DDOM
	Module Name [M]	Unique name for the Data Dictionary/Domain module.	A	Alphanum	Name must begin with an alphabetic character other than a SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Attribute Label [M]	Attribute label.	A	Gr-chars	Subfield name as in the Attribute Primary, Secondary and Cell modules must conform to the SQL standard as described in 4.1.3.6.8. The Attribute Label subfield must contain, if necessary, a concatenation of the field and subfield mnemonics for the representation index separated by a slash for domain types dd: for case (i) in section 4.2.1.	ATLB
	Attribute Authority [M]	Name of the attribute authority.	A	Gr-chars	Any combination of at most eight graphics characters.	AUTH
	Attribute Domain Type [M]	Attribute Domain Type. If the authority is another FIPS standard which contains standard codes for attribute values, specify FIPSCODE in this subfield.	A	GR-CHARS ALPHANUM ALPHABET INTEGER REAL BINARY ENUMERATED FIPSCODE		ATYP
Note: the contents of the Attribute Domain Value Format subfield must be the same in all records specifying the same attribute (where the Attribute Label and Attribute Authority subfield contents are equivalent).
	Attribute Domain Value Format [M]	Attribute domain value format.	A	A I R S B BI8 BI16 BI24 BI32 BUI8 BUI16 BUI24 BUI32 BFP32 BFP64 C	Graphics Characters Implicit-point (integer) Explicit-point unscaled Explicit-point scaled Bitfield data 8-bit signed integer 16-bit signed integer 24-bit signed integer 32-bit signed integer 8-bit unsigned integer 16-bit unsigned integer 24-bit unsigned integer 32-bit unsigned integer 32-bit floating point real 64-bit floating point real Character mode bitfield	ADVF
	Attribute Domain Value Measurement Unit	Measurement unit of attribute domain value.	A	Gr-chars	Any combination of graphics characters.	ADMU
	Range or Value [M]	Indicates whether the value is single value or the maximum or minimum of a range.	A	MIN	Value is minimum of a range or subrange.	RAVA
				MAX	Value is maximum of a range or subrange.
				VALUE	Value of the specified domain with specific significance described in the Domain Value Definition subfield.
	Domain Value [M]	Possible value of lower or upper range limit for the attribute value. Subfield only applies when range, enumerated or code set domain. When a code set is used, contains the name of the code set.	A|I|R S|B|C	Gr-chars Integer Real Binary NULL	As indicated by Attribute Domain Value Format.Value may be intermittently absent or field or subfield may be intermittently empty.	DVAL
	Domain Value Definition	Definition of or description associated with the Domain Value.	A	Gr-chars	Any combination of graphic characters.	DVDF

Table 24 - Data dictionary/schema module specification

FIELD NAME	SuBFIELD NAME	FIELD/SUBFIELD DEsCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Data Dictionary/Schema (P) [M]						DDSH
	Module Name [M]	Schema module name.	A	Alphanum	Name must begin with an alphabetic character other than a SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Name [M]	Name of module with data to which the schema applies.	A	Alphanum	Name must begin with an alphabetic character and be the module name of an Attribute or Cell module.	NAME
	Type	Type of module with data to which the schema applies.	A	ATPR	Applies to Attribute Primary Module.	TYPE
				ATSC	Applies to Attribute Secondary Module.
				CELL	Applies to a Cell Module.
	Entity Label [O/Attribute Label]	Entity label of entity for which the subfield will contain an attribute value.	A	Gr-chars	Any combination of graphics characters.	ETLB
	Entity Authority [O/Attribute Label]	Authority for the definition (including meaning) of the entity.	A	SDTS-USA	Part 2 of this standard is the authority for the definition of the uniquely named entity.	EUTH
				SDTS-xxx	A standard register of entities and attributes for a country other than the United States is the authority for the definition of the uniquely named entity. "xxx" is the three-character ISO 3166 country code.
				Gr-chars	Any combination of up to eight graphics characters. The meaning of this code must be explained in a Data Dictionary/Definition module.
	Attribute Label [M/Attribute Primary]	Name of attribute subfield	A	Gr-chars	Attribute subfield name as in the Attribute Primary, Attribute Secondary, and Cell modules. Must conform to the SQL standard as described in 4.1.3.6.8.	ATLB
	Attribute Authority [M/Attribute Primary]	Authority for the definition (including meaning) of the attribute.	A	SDTS-USA	Part 2 of this standard is the authority for the definition of the uniquely named attribute.	AUTH
				SDTS-xxx	A standard register of entities and attributes for a country other than the United States is the authority for the definition of the uniquely named attribute. "xxx" is the three-character ISO 3166 country code.
				Gr-chars	Any combination of up to eight graphics characters. The meaning of this code must be explained in a Data Dictionary/Definition module.
Note: The selected code must correspond to the data type and domain for the subfield in the attribute or cell module to which the schema module applies.
	Format [M/Attribute Primary]	Format for contents of attribute subfield.	A	A I R S B BI8 BI16 BI24 BI32 BUI BUI8 BUI16 BUI24 BUI32 BFP32 BFP64 C ^	Graphics characters Implicit-point (integer) Explicit-point unscaled Explicit-point scaled Bitfield data 8-bit signed integer 16-bit signed integer 24-bit signed integer 32-bit signed integer Unsigned integer 8-bit unsigned integer 16-bit unsigned integer 24-bit unsigned integer 32-bit unsigned integer 32-bit floating point real 64-bit floating point real Character mode bitfield Packed foreign identifier	FMT
	Unit	Measurement unit for contents of attribute subfield	A	Gr-chars	Any combination of graphics characters. Any recognizable measurement unit or abbreviation for measurement unit	UNIT
	Precision	The minimum difference between consecutive measurements, given in same units as the values.	R	Real		PREC
	Maximum Subfield Length [M/Attribute Primary]	Maximum length of the subfield for all module records expressed as the maximum number of ASCII characters.	I	Integer	Unsigned Integer >= 1.	MXLN
	Key [X/Type=CELL]	Indicates whether attribute is part of primary or foreign relational key.	A	NOKEY	Attribute is not part of key	KEY
				PKEY	Attribute is part of primary key
				FKEY	Attribute is part of foreign key
				PFKEY	Attribute is part of both primary and foreign key

Table 25 - Transfer statistics module specification

FIELD NAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
Transfer Statistics (P) [M]						STAT
	Module Name [M]	A unique identifier for this Transfer Statistics module.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MODN
	Record ID [M]	A number for the module record, unique within the module.	I	Integer	Unsigned integer; with Module Name must form unique ID within the file set.	RCID
	Module Type Referred	The primary field name of the module to which the total module record count refers.	A	Alphanum	Valid primary field name.	MNTF
	Module Name Referred [M]	Module name of module to which the total module record count refers.	A	Alphanum	Name must begin with an alphabetic character other than SPACE.	MNRF
	Module Record Count [O/Spatial Address Count]	Total number of module records in the module with the module name given in the Module Name Referred field.	I	Integer	Unsigned integer >= 1.	NREC
	Spatial Address Count [O/Module Record Count]	The total number of spatial address field instances in the module.	I	Integer	Unsigned integer >= 0.	NSAD