How to encode datum definitions. Builds on referenceSystems.xsd to encode the data needed to define datums, including the
specific subtypes of datums.
This schema encodes the Datum (CD_) package of the extended UML Model for OGC Abstract Specification Topic 2: Spatial Referencing
by Coordinates. That UML model is adapted from ISO 19111 - Spatial referencing by coordinates, as described in Annex C of
Topic 2.
Caution: The CRS package in GML 3.1 and GML 3.1.1 is preliminary, and is expected to undergo some modifications that are
not backward compatible during the development of GML 3.2 (ISO 19136). The GML 3.2 package will implement the model described
in the revised version of ISO 19111.
GML is an OGC Standard.
Copyright (c) 2001,2005,2010 Open Geospatial Consortium.
To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ .
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
<element name="datumName" type="gml:CodeType" substitutionGroup="gml:name"><annotation><documentation>The name by which this datum is identified.</documentation></annotation></element>
<element name="datumID" type="gml:IdentifierType"><annotation><documentation>An identification of a datum.</documentation></annotation></element>
Element gml:anchorPoint
Namespace
http://www.opengis.net/gml
Annotations
Description, possibly including coordinates, of the point or points used to anchor the datum to the Earth. Also known as the
"origin", especially for engineering and image datums. The codeSpace attribute can be used to reference a source of more detailed
on this point or surface, or on a set of such descriptions.
- For a geodetic datum, this point is also known as the fundamental point, which is traditionally the point where the relationship
between geoid and ellipsoid is defined. In some cases, the "fundamental point" may consist of a number of points. In those
cases, the parameters defining the geoid/ellipsoid relationship have been averaged for these points, and the averages adopted
as the datum definition.
- For an engineering datum, the anchor point may be a physical point, or it may be a point with defined coordinates in another
CRS. When appropriate, the coordinates of this anchor point can be referenced in another document, such as referencing a GML
feature that references or includes a point position.
- For an image datum, the anchor point is usually either the centre of the image or the corner of the image.
- For a temporal datum, this attribute is not defined. Instead of the anchor point, a temporal datum carries a separate time
origin of type DateTime.
<element name="anchorPoint" type="gml:CodeType"><annotation><documentation>Description, possibly including coordinates, of the point or points used to anchor the datum to the Earth. Also known as the "origin", especially for engineering and image datums. The codeSpace attribute can be used to reference a source of more detailed on this point or surface, or on a set of such descriptions.
- For a geodetic datum, this point is also known as the fundamental point, which is traditionally the point where the relationship between geoid and ellipsoid is defined. In some cases, the "fundamental point" may consist of a number of points. In those cases, the parameters defining the geoid/ellipsoid relationship have been averaged for these points, and the averages adopted as the datum definition.
- For an engineering datum, the anchor point may be a physical point, or it may be a point with defined coordinates in another CRS. When appropriate, the coordinates of this anchor point can be referenced in another document, such as referencing a GML feature that references or includes a point position.
- For an image datum, the anchor point is usually either the centre of the image or the corner of the image.
- For a temporal datum, this attribute is not defined. Instead of the anchor point, a temporal datum carries a separate time origin of type DateTime.</documentation></annotation></element>
Element gml:realizationEpoch
Namespace
http://www.opengis.net/gml
Annotations
The time after which this datum definition is valid. This time may be precise (e.g. 1997.0 for IRTF97) or merely a year (e.g.
1983 for NAD83). In the latter case, the epoch usually refers to the year in which a major recalculation of the geodetic control
network, underlying the datum, was executed or initiated. An old datum can remain valid after a new datum is defined. Alternatively,
a datum may be superseded by a later datum, in which case the realization epoch for the new datum defines the upper limit
for the validity of the superseded datum.
<element name="realizationEpoch" type="date"><annotation><documentation>The time after which this datum definition is valid. This time may be precise (e.g. 1997.0 for IRTF97) or merely a year (e.g. 1983 for NAD83). In the latter case, the epoch usually refers to the year in which a major recalculation of the geodetic control network, underlying the datum, was executed or initiated. An old datum can remain valid after a new datum is defined. Alternatively, a datum may be superseded by a later datum, in which case the realization epoch for the new datum defines the upper limit for the validity of the superseded datum.</documentation></annotation></element>
Element gml:usesPrimeMeridian
Namespace
http://www.opengis.net/gml
Annotations
Association to the prime meridian used by this geodetic datum.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<element name="usesPrimeMeridian" type="gml:PrimeMeridianRefType"><annotation><documentation>Association to the prime meridian used by this geodetic datum.</documentation></annotation></element>
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
The name by which this prime meridian is identified. The meridianName most common value is Greenwich, and that value shall
be used when the greenwichLongitude value is zero.
<element name="meridianName" type="gml:CodeType" substitutionGroup="gml:name"><annotation><documentation>The name by which this prime meridian is identified. The meridianName most common value is Greenwich, and that value shall be used when the greenwichLongitude value is zero.</documentation></annotation></element>
<element name="meridianID" type="gml:IdentifierType"><annotation><documentation>An identification of a prime meridian.</documentation></annotation></element>
Element gml:greenwichLongitude
Namespace
http://www.opengis.net/gml
Annotations
Longitude of the prime meridian measured from the Greenwich meridian, positive eastward. The greenwichLongitude most common
value is zero, and that value shall be used when the meridianName value is Greenwich.
<element name="greenwichLongitude" type="gml:AngleChoiceType"><annotation><documentation>Longitude of the prime meridian measured from the Greenwich meridian, positive eastward. The greenwichLongitude most common value is zero, and that value shall be used when the meridianName value is Greenwich.</documentation></annotation></element>
Element gml:usesEllipsoid
Namespace
http://www.opengis.net/gml
Annotations
Association to the ellipsoid used by this geodetic datum.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<element name="usesEllipsoid" type="gml:EllipsoidRefType"><annotation><documentation>Association to the ellipsoid used by this geodetic datum.</documentation></annotation></element>
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
<element name="ellipsoidName" type="gml:CodeType" substitutionGroup="gml:name"><annotation><documentation>The name by which this ellipsoid is identified.</documentation></annotation></element>
<element name="ellipsoidID" type="gml:IdentifierType"><annotation><documentation>An identification of an ellipsoid.</documentation></annotation></element>
Element gml:semiMajorAxis
Namespace
http://www.opengis.net/gml
Annotations
Length of the semi-major axis of the ellipsoid, with its units. Uses the MeasureType with the restriction that the unit of
measure referenced by uom must be suitable for a length, such as metres or feet.
<element name="semiMajorAxis" type="gml:MeasureType"><annotation><documentation>Length of the semi-major axis of the ellipsoid, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a length, such as metres or feet.</documentation></annotation></element>
Inverse flattening value of the ellipsoid. Value is a scale factor (or ratio) that has no physical unit. Uses the MeasureType
with the restriction that the unit of measure referenced by uom must be suitable for a scale factor, such as percent, permil,
or parts-per-million.
<element name="inverseFlattening" type="gml:MeasureType"><annotation><documentation>Inverse flattening value of the ellipsoid. Value is a scale factor (or ratio) that has no physical unit. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a scale factor, such as percent, permil, or parts-per-million.</documentation></annotation></element>
Element gml:semiMinorAxis
Namespace
http://www.opengis.net/gml
Annotations
Length of the semi-minor axis of the ellipsoid. Uses the MeasureType with the restriction that the unit of measure referenced
by uom must be suitable for a length, such as metres or feet.
<element name="semiMinorAxis" type="gml:MeasureType"><annotation><documentation>Length of the semi-minor axis of the ellipsoid. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a length, such as metres or feet.</documentation></annotation></element>
Element gml:isSphere
Namespace
http://www.opengis.net/gml
Annotations
The ellipsoid is degenerate and is actually a sphere. The sphere is completely defined by the semi-major axis, which is the
radius of the sphere.
<element name="isSphere"><annotation><documentation>The ellipsoid is degenerate and is actually a sphere. The sphere is completely defined by the semi-major axis, which is the radius of the sphere.</documentation></annotation><simpleType><restriction base="string"><enumeration value="sphere"/></restriction></simpleType></element>
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
<element name="origin" type="dateTime"><annotation><documentation>The date and time origin of this temporal datum.</documentation></annotation></element>
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<complexType name="GeodeticDatumRefType"><annotation><documentation>Association to a geodetic datum, either referencing or containing the definition of that datum.</documentation></annotation><sequence minOccurs="0"><element ref="gml:GeodeticDatum"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>
Complex Type gml:GeodeticDatumType
Namespace
http://www.opengis.net/gml
Annotations
A geodetic datum defines the precise location and orientation in 3-dimensional space of a defined ellipsoid (or sphere) that
approximates the shape of the earth, or of a Cartesian coordinate system centered in this ellipsoid (or sphere).
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="GeodeticDatumType"><annotation><documentation>A geodetic datum defines the precise location and orientation in 3-dimensional space of a defined ellipsoid (or sphere) that approximates the shape of the earth, or of a Cartesian coordinate system centered in this ellipsoid (or sphere).</documentation></annotation><complexContent><extension base="gml:AbstractDatumType"><sequence><element ref="gml:usesPrimeMeridian"/><element ref="gml:usesEllipsoid"/></sequence></extension></complexContent></complexType>
Complex Type gml:AbstractDatumType
Namespace
http://www.opengis.net/gml
Annotations
A datum specifies the relationship of a coordinate system to the earth, thus creating a coordinate reference system. A datum
uses a parameter or set of parameters that determine the location of the origin of the coordinate reference system. Each datum
subtype can be associated with only specific types of coordinate systems. This abstract complexType shall not be used, extended,
or restricted, in an Application Schema, to define a concrete subtype with a meaning equivalent to a concrete subtype specified
in this document.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="AbstractDatumType" abstract="true"><annotation><documentation>A datum specifies the relationship of a coordinate system to the earth, thus creating a coordinate reference system. A datum uses a parameter or set of parameters that determine the location of the origin of the coordinate reference system. Each datum subtype can be associated with only specific types of coordinate systems. This abstract complexType shall not be used, extended, or restricted, in an Application Schema, to define a concrete subtype with a meaning equivalent to a concrete subtype specified in this document.</documentation></annotation><complexContent><extension base="gml:AbstractDatumBaseType"><sequence><element ref="gml:datumID" minOccurs="0" maxOccurs="unbounded"><annotation><documentation>Set of alternative identifications of this datum. The first datumID, if any, is normally the primary identification code, and any others are aliases.</documentation></annotation></element><element ref="gml:remarks" minOccurs="0"><annotation><documentation>Comments on this reference system, including source information.</documentation></annotation></element><element ref="gml:anchorPoint" minOccurs="0"/><element ref="gml:realizationEpoch" minOccurs="0"/><element ref="gml:validArea" minOccurs="0"/><element ref="gml:scope" minOccurs="0"/></sequence></extension></complexContent></complexType>
Complex Type gml:AbstractDatumBaseType
Namespace
http://www.opengis.net/gml
Annotations
Basic encoding for datum objects, simplifying and restricting the DefinitionType as needed.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="AbstractDatumBaseType" abstract="true"><annotation><documentation>Basic encoding for datum objects, simplifying and restricting the DefinitionType as needed.</documentation></annotation><complexContent><restriction base="gml:DefinitionType"><sequence><element ref="gml:metaDataProperty" minOccurs="0" maxOccurs="unbounded"/><element ref="gml:datumName"/></sequence><attribute ref="gml:id" use="required"/></restriction></complexContent></complexType>
Complex Type gml:PrimeMeridianRefType
Namespace
http://www.opengis.net/gml
Annotations
Association to a prime meridian, either referencing or containing the definition of that meridian.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<complexType name="PrimeMeridianRefType"><annotation><documentation>Association to a prime meridian, either referencing or containing the definition of that meridian.</documentation></annotation><sequence minOccurs="0"><element ref="gml:PrimeMeridian"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>
Complex Type gml:PrimeMeridianType
Namespace
http://www.opengis.net/gml
Annotations
A prime meridian defines the origin from which longitude values are determined.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="PrimeMeridianType"><annotation><documentation>A prime meridian defines the origin from which longitude values are determined.</documentation></annotation><complexContent><extension base="gml:PrimeMeridianBaseType"><sequence><element ref="gml:meridianID" minOccurs="0" maxOccurs="unbounded"><annotation><documentation>Set of alternative identifications of this prime meridian. The first meridianID, if any, is normally the primary identification code, and any others are aliases.</documentation></annotation></element><element ref="gml:remarks" minOccurs="0"><annotation><documentation>Comments on or information about this prime meridian, including source information.</documentation></annotation></element><element ref="gml:greenwichLongitude"/></sequence></extension></complexContent></complexType>
Complex Type gml:PrimeMeridianBaseType
Namespace
http://www.opengis.net/gml
Annotations
Basic encoding for prime meridian objects, simplifying and restricting the DefinitionType as needed.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="PrimeMeridianBaseType" abstract="true"><annotation><documentation>Basic encoding for prime meridian objects, simplifying and restricting the DefinitionType as needed.</documentation></annotation><complexContent><restriction base="gml:DefinitionType"><sequence><element ref="gml:metaDataProperty" minOccurs="0" maxOccurs="unbounded"/><element ref="gml:meridianName"/></sequence><attribute ref="gml:id" use="required"/></restriction></complexContent></complexType>
Complex Type gml:EllipsoidRefType
Namespace
http://www.opengis.net/gml
Annotations
Association to an ellipsoid, either referencing or containing the definition of that ellipsoid.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<complexType name="EllipsoidRefType"><annotation><documentation>Association to an ellipsoid, either referencing or containing the definition of that ellipsoid.</documentation></annotation><sequence minOccurs="0"><element ref="gml:Ellipsoid"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>
Complex Type gml:EllipsoidType
Namespace
http://www.opengis.net/gml
Annotations
An ellipsoid is a geometric figure that can be used to describe the approximate shape of the earth. In mathematical terms,
it is a surface formed by the rotation of an ellipse about its minor axis.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="EllipsoidType"><annotation><documentation>An ellipsoid is a geometric figure that can be used to describe the approximate shape of the earth. In mathematical terms, it is a surface formed by the rotation of an ellipse about its minor axis.</documentation></annotation><complexContent><extension base="gml:EllipsoidBaseType"><sequence><element ref="gml:ellipsoidID" minOccurs="0" maxOccurs="unbounded"><annotation><documentation>Set of alternative identifications of this ellipsoid. The first ellipsoidID, if any, is normally the primary identification code, and any others are aliases.</documentation></annotation></element><element ref="gml:remarks" minOccurs="0"><annotation><documentation>Comments on or information about this ellipsoid, including source information.</documentation></annotation></element><element ref="gml:semiMajorAxis"/><element ref="gml:secondDefiningParameter"/></sequence></extension></complexContent></complexType>
Complex Type gml:EllipsoidBaseType
Namespace
http://www.opengis.net/gml
Annotations
Basic encoding for ellipsoid objects, simplifying and restricting the DefinitionType as needed.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="EllipsoidBaseType" abstract="true"><annotation><documentation>Basic encoding for ellipsoid objects, simplifying and restricting the DefinitionType as needed.</documentation></annotation><complexContent><restriction base="gml:DefinitionType"><sequence><element ref="gml:metaDataProperty" minOccurs="0" maxOccurs="unbounded"/><element ref="gml:ellipsoidName"/></sequence><attribute ref="gml:id" use="required"/></restriction></complexContent></complexType>
Complex Type gml:SecondDefiningParameterType
Namespace
http://www.opengis.net/gml
Annotations
Definition of the second parameter that defines the shape of an ellipsoid. An ellipsoid requires two defining parameters:
semi-major axis and inverse flattening or semi-major axis and semi-minor axis. When the reference body is a sphere rather
than an ellipsoid, only a single defining parameter is required, namely the radius of the sphere; in that case, the semi-major
axis "degenerates" into the radius of the sphere.
<complexType name="SecondDefiningParameterType"><annotation><documentation>Definition of the second parameter that defines the shape of an ellipsoid. An ellipsoid requires two defining parameters: semi-major axis and inverse flattening or semi-major axis and semi-minor axis. When the reference body is a sphere rather than an ellipsoid, only a single defining parameter is required, namely the radius of the sphere; in that case, the semi-major axis "degenerates" into the radius of the sphere.</documentation></annotation><choice><element ref="gml:inverseFlattening"/><element ref="gml:semiMinorAxis"/><element ref="gml:isSphere"/></choice></complexType>
Complex Type gml:VerticalDatumRefType
Namespace
http://www.opengis.net/gml
Annotations
Association to a vertical datum, either referencing or containing the definition of that datum.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<complexType name="VerticalDatumRefType"><annotation><documentation>Association to a vertical datum, either referencing or containing the definition of that datum.</documentation></annotation><sequence minOccurs="0"><element ref="gml:VerticalDatum"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>
Complex Type gml:VerticalDatumType
Namespace
http://www.opengis.net/gml
Annotations
A textual description and/or a set of parameters identifying a particular reference level surface used as a zero-height surface,
including its position with respect to the Earth for any of the height types recognized by this standard. There are several
types of Vertical Datums, and each may place constraints on the Coordinate Axis with which it is combined to create a Vertical
CRS.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="VerticalDatumType"><annotation><documentation>A textual description and/or a set of parameters identifying a particular reference level surface used as a zero-height surface, including its position with respect to the Earth for any of the height types recognized by this standard. There are several types of Vertical Datums, and each may place constraints on the Coordinate Axis with which it is combined to create a Vertical CRS.</documentation></annotation><complexContent><extension base="gml:AbstractDatumType"><sequence><element ref="gml:verticalDatumType" minOccurs="0"/></sequence></extension></complexContent></complexType>
Reference to a source of information specifying the values and meanings of all the allowed string values for this VerticalDatumTypeType.
Source
<complexType name="VerticalDatumTypeType"><annotation><documentation>Type of a vertical datum.</documentation></annotation><simpleContent><restriction base="gml:CodeType"><attribute name="codeSpace" type="anyURI" use="required"><annotation><documentation>Reference to a source of information specifying the values and meanings of all the allowed string values for this VerticalDatumTypeType.</documentation></annotation></attribute></restriction></simpleContent></complexType>
Complex Type gml:EngineeringDatumRefType
Namespace
http://www.opengis.net/gml
Annotations
Association to an engineering datum, either referencing or containing the definition of that datum.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<complexType name="EngineeringDatumRefType"><annotation><documentation>Association to an engineering datum, either referencing or containing the definition of that datum.</documentation></annotation><sequence minOccurs="0"><element ref="gml:EngineeringDatum"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>
Complex Type gml:EngineeringDatumType
Namespace
http://www.opengis.net/gml
Annotations
An engineering datum defines the origin of an engineering coordinate reference system, and is used in a region around that
origin. This origin can be fixed with respect to the earth (such as a defined point at a construction site), or be a defined
point on a moving vehicle (such as on a ship or satellite).
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="EngineeringDatumType"><annotation><documentation>An engineering datum defines the origin of an engineering coordinate reference system, and is used in a region around that origin. This origin can be fixed with respect to the earth (such as a defined point at a construction site), or be a defined point on a moving vehicle (such as on a ship or satellite).</documentation></annotation><complexContent><extension base="gml:AbstractDatumType"/></complexContent></complexType>
Complex Type gml:ImageDatumRefType
Namespace
http://www.opengis.net/gml
Annotations
Association to an image datum, either referencing or containing the definition of that datum.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<complexType name="ImageDatumRefType"><annotation><documentation>Association to an image datum, either referencing or containing the definition of that datum.</documentation></annotation><sequence minOccurs="0"><element ref="gml:ImageDatum"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>
Complex Type gml:ImageDatumType
Namespace
http://www.opengis.net/gml
Annotations
An image datum defines the origin of an image coordinate reference system, and is used in a local context only. For more information,
see OGC Abstract Specification Topic 2.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="ImageDatumType"><annotation><documentation>An image datum defines the origin of an image coordinate reference system, and is used in a local context only. For more information, see OGC Abstract Specification Topic 2.</documentation></annotation><complexContent><extension base="gml:AbstractDatumType"><sequence><element ref="gml:pixelInCell"/></sequence></extension></complexContent></complexType>
Complex Type gml:PixelInCellType
Namespace
http://www.opengis.net/gml
Annotations
Specification of the way an image grid is associated with the image data attributes.
Reference to a source of information specifying the values and meanings of all the allowed string values for this PixelInCellType.
Source
<complexType name="PixelInCellType"><annotation><documentation>Specification of the way an image grid is associated with the image data attributes.</documentation></annotation><simpleContent><restriction base="gml:CodeType"><attribute name="codeSpace" type="anyURI" use="required"><annotation><documentation>Reference to a source of information specifying the values and meanings of all the allowed string values for this PixelInCellType.</documentation></annotation></attribute></restriction></simpleContent></complexType>
Complex Type gml:TemporalDatumRefType
Namespace
http://www.opengis.net/gml
Annotations
Association to a temporal datum, either referencing or containing the definition of that datum.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<complexType name="TemporalDatumRefType"><annotation><documentation>Association to a temporal datum, either referencing or containing the definition of that datum.</documentation></annotation><sequence minOccurs="0"><element ref="gml:TemporalDatum"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>
Complex Type gml:TemporalDatumType
Namespace
http://www.opengis.net/gml
Annotations
Defines the origin of a temporal coordinate reference system. This type extends the TemporalDatumRestrictionType to add the
"origin" element with the dateTime type.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="TemporalDatumType"><annotation><documentation>Defines the origin of a temporal coordinate reference system. This type extends the TemporalDatumRestrictionType to add the "origin" element with the dateTime type.</documentation></annotation><complexContent><extension base="gml:TemporalDatumBaseType"><sequence><element ref="gml:origin"/></sequence></extension></complexContent></complexType>
Complex Type gml:TemporalDatumBaseType
Namespace
http://www.opengis.net/gml
Annotations
Partially defines the origin of a temporal coordinate reference system. This type restricts the AbstractDatumType to remove
the "anchorPoint" and "realizationEpoch" elements.
Database handle for the object. It is of XML type ID, so is constrained to be unique in the XML document within which it
occurs. An external identifier for the object in the form of a URI may be constructed using standard XML and XPointer methods.
This is done by concatenating the URI for the document, a fragment separator, and the value of the id attribute.
Source
<complexType name="TemporalDatumBaseType" abstract="true"><annotation><documentation>Partially defines the origin of a temporal coordinate reference system. This type restricts the AbstractDatumType to remove the "anchorPoint" and "realizationEpoch" elements.</documentation></annotation><complexContent><restriction base="gml:AbstractDatumType"><sequence><element ref="gml:metaDataProperty" minOccurs="0" maxOccurs="unbounded"/><element ref="gml:datumName"/><element ref="gml:datumID" minOccurs="0" maxOccurs="unbounded"/><element ref="gml:validArea" minOccurs="0"/><element ref="gml:scope" minOccurs="0"/></sequence><attribute ref="gml:id" use="required"/></restriction></complexContent></complexType>
Complex Type gml:DatumRefType
Namespace
http://www.opengis.net/gml
Annotations
Association to a datum, either referencing or containing the definition of that datum.
Reference to an XML Schema fragment that specifies the content model of the propertys value. This is in conformance with the
XML Schema Section 4.14 Referencing Schemas from Elsewhere.
<complexType name="DatumRefType"><annotation><documentation>Association to a datum, either referencing or containing the definition of that datum.</documentation></annotation><sequence minOccurs="0"><element ref="gml:_Datum"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>
<attribute name="codeSpace" type="anyURI" use="required"><annotation><documentation>Reference to a source of information specifying the values and meanings of all the allowed string values for this VerticalDatumTypeType.</documentation></annotation></attribute>
<attribute name="codeSpace" type="anyURI" use="required"><annotation><documentation>Reference to a source of information specifying the values and meanings of all the allowed string values for this PixelInCellType.</documentation></annotation></attribute>
