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geometryBasic0d1d.xsdSchematron validationThe presence of a dimension attribute implies the presence of the srsName attribute.The presence of an axisLabels attribute implies the presence of the srsName attribute.The presence of an uomLabels attribute implies the presence of the srsName attribute.The presence of an uomLabels attribute implies the presence of the axisLabels attribute and vice versa.The presence of a count attribute implies the presence of the dimension attribute.
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This includes not only measures.xsd, but also units.xsd, gmlBase.xsd and basicTypes.xsd.The "_Geometry" element is the abstract head of the substituition group for all geometry elements of GML 3. This
includes pre-defined and user-defined geometry elements. Any geometry element must be a direct or indirect extension/restriction
of AbstractGeometryType and must be directly or indirectly in the substitution group of "_Geometry".A geometric property can either be any geometry element encapsulated in an element of this type or an XLink reference
to a remote geometry element (where remote includes geometry elements located elsewhere in the same document). Note that either
the reference or the contained element must be given, but not both or none.This attribute group includes the XLink attributes (see xlinks.xsd). XLink is used in GML to reference
remote resources (including those elsewhere in the same document). A simple link element can be constructed by
including a specific set of XLink attributes. The XML Linking Language (XLink) is currently a Proposed Recommendation
of the World Wide Web Consortium. XLink allows elements to be inserted into XML documents so as to create
sophisticated links between resources; such links can be used to reference remote properties. A simple link element
can be used to implement pointer functionality, and this functionality has been built into various GML 3 elements by
including the gml:AssociationAttributeGroup.A container for an array of geometry elements. The elements are always contained in the array property,
referencing geometry elements or arrays of geometry elements is not supported.All geometry elements are derived directly or indirectly from this abstract supertype. A geometry element may
have an identifying attribute ("gml:id"), a name (attribute "name") and a description (attribute "description"). It may be associated
with a spatial reference system (attribute "srsName"). The following rules shall be adhered: - Every geometry type shall derive
from this abstract type. - Every geometry element (i.e. an element of a geometry type) shall be directly or indirectly in the
substitution group of _Geometry.This attribute is included for backward compatibility with GML 2 and is deprecated with GML 3.
This identifer is superceded by "gml:id" inherited from AbstractGMLType. The attribute "gid" should not be used
anymore and may be deleted in future versions of GML without further notice.Optional reference to the CRS used by this geometry, with optional additional information to simplify use when
a more complete definition of the CRS is not needed.In general this reference points to a CRS instance of gml:CoordinateReferenceSystemType
(see coordinateReferenceSystems.xsd). For well known references it is not required that the CRS description exists at the
location the URI points to. If no srsName attribute is given, the CRS must be specified as part of the larger context this
geometry element is part of, e.g. a geometric element like point, curve, etc. It is expected that this attribute will be specified
at the direct position level only in rare cases.The "srsDimension" is the length of coordinate sequence (the number of entries in the list). This dimension is
specified by the coordinate reference system. When the srsName attribute is omitted, this attribute shall be omitted.Optional additional and redundant information for a CRS to simplify use when a more complete definition of the
CRS is not needed. This information shall be the same as included in the more complete definition of the CRS, referenced by the
srsName attribute. When the srsName attribute is included, either both or neither of the axisLabels and uomLabels attributes
shall be included. When the srsName attribute is omitted, both of these attributes shall be omitted.Ordered list of labels for all the axes of this CRS. The gml:axisAbbrev value should be used for these axis
labels, after spaces and forbiddden characters are removed. When the srsName attribute is included, this attribute is optional.
When the srsName attribute is omitted, this attribute shall also be omitted.Ordered list of unit of measure (uom) labels for all the axes of this CRS. The value of the string in the
gml:catalogSymbol should be used for this uom labels, after spaces and forbiddden characters are removed. When the
axisLabels attribute is included, this attribute shall also be included. When the axisLabels attribute is omitted, this attribute
shall also be omitted.The "_GeometricPrimitive" element is the abstract head of the substituition group for all (pre- and user-defined)
geometric primitives.This is the abstract root type of the geometric primitives. A geometric primitive is a geometric object that is not
decomposed further into other primitives in the system. All primitives are oriented in the direction implied by the sequence of their
coordinate tuples.A property that has a geometric primitive as its value domain can either be an appropriate geometry element
encapsulated in an element of this type or an XLink reference to a remote geometry element (where remote includes geometry
elements located elsewhere in the same document). Either the reference or the contained element must be given, but neither
both nor none.This attribute group includes the XLink attributes (see xlinks.xsd). XLink is used in GML to reference remote
resources (including those elsewhere in the same document). A simple link element can be constructed by including a
specific set of XLink attributes. The XML Linking Language (XLink) is currently a Proposed Recommendation of the World Wide
Web Consortium. XLink allows elements to be inserted into XML documents so as to create sophisticated links between
resources; such links can be used to reference remote properties. A simple link element can be used to implement pointer
functionality, and this functionality has been built into various GML 3 elements by including the gml:AssociationAttributeGroup.A Point is defined by a single coordinate tuple.GML supports two different ways to specify the direct poisiton of a point. 1. The "pos" element is of type
DirectPositionType.Deprecated with GML version 3.1.0 for coordinates with ordinate values that are numbers. Use "pos"
instead. The "coordinates" element shall only be used for coordinates with ordinates that require a string
representation, e.g. DMS representations.Deprecated with GML version 3.0. Use "pos" instead. The "coord" element is included for
backwards compatibility with GML 2.This property element either references a point via the XLink-attributes or contains the point element. pointProperty
is the predefined property which can be used by GML Application Schemas whenever a GML Feature has a property with a value that
is substitutable for Point.Deprecated with GML version 3.1.0. Use "pointProperty" instead. Included for backwards compatibility with GML 3.0.0.A property that has a point as its value domain can either be an appropriate geometry element encapsulated in an
element of this type or an XLink reference to a remote geometry element (where remote includes geometry elements located
elsewhere in the same document). Either the reference or the contained element must be given, but neither both nor none.This attribute group includes the XLink attributes (see xlinks.xsd). XLink is used in GML to reference remote
resources (including those elsewhere in the same document). A simple link element can be constructed by including a specific
set of XLink attributes. The XML Linking Language (XLink) is currently a Proposed Recommendation of the World Wide Web Consortium.
XLink allows elements to be inserted into XML documents so as to create sophisticated links between resources; such links can be
used to reference remote properties. A simple link element can be used to implement pointer functionality, and this functionality has
been built into various GML 3 elements by including the gml:AssociationAttributeGroup.A container for an array of points. The elements are always contained in the array property, referencing geometry
elements or arrays of geometry elements is not supported.The "_Curve" element is the abstract head of the substituition group for all (continuous) curve elements.An abstraction of a curve to support the different levels of complexity. The curve can always be viewed as a geometric
primitive, i.e. is continuous.This property element either references a curve via the XLink-attributes or contains the curve element. curveProperty is the
predefined property which can be used by GML Application Schemas whenever a GML Feature has a property with a value that is
substitutable for _Curve.A property that has a curve as its value domain can either be an appropriate geometry element encapsulated in an
element of this type or an XLink reference to a remote geometry element (where remote includes geometry elements located elsewhere
in the same document). Either the reference or the contained element must be given, but neither both nor none.This attribute group includes the XLink attributes (see xlinks.xsd). XLink is used in GML to reference remote
resources (including those elsewhere in the same document). A simple link element can be constructed by including a specific
set of XLink attributes. The XML Linking Language (XLink) is currently a Proposed Recommendation of the World Wide Web Consortium.
XLink allows elements to be inserted into XML documents so as to create sophisticated links between resources; such links can be used
to reference remote properties. A simple link element can be used to implement pointer functionality, and this functionality has been built
into various GML 3 elements by including the gml:AssociationAttributeGroup.A container for an array of curves. The elements are always contained in the array property, referencing geometry elements
or arrays of geometry elements is not supported.A LineString is a special curve that consists of a single segment with linear interpolation. It is defined by two or more coordinate
tuples, with linear interpolation between them. It is backwards compatible with the LineString of GML 2, GM_LineString of ISO 19107 is
implemented by LineStringSegment.GML supports two different ways to specify the control points of a line string. 1. A sequence of "pos"
(DirectPositionType) or "pointProperty" (PointPropertyType) elements. "pos" elements are control points that are only part
of this curve, "pointProperty" elements contain a point that may be referenced from other geometry elements or reference
another point defined outside of this curve (reuse of existing points). 2. The "posList" element allows for a compact way to
specifiy the coordinates of the control points, if all control points are in the same coordinate reference systems and belong
to this curve only. The number of direct positions in the list must be at least two.Deprecated with GML version 3.1.0. Use "pointProperty" instead. Included for backwards compatibility
with GML 3.0.0.Deprecated with GML version 3.0. Use "pos" instead. The "coord" element is included for backwards
compatibility with GML 2.Deprecated with GML version 3.1.0. Use "posList" instead.DirectPosition instances hold the coordinates for a position within some coordinate reference system (CRS). Since
DirectPositions, as data types, will often be included in larger objects (such as geometry elements) that have references to CRS, the
"srsName" attribute will in general be missing, if this particular DirectPosition is included in a larger element with such a reference to a
CRS. In this case, the CRS is implicitly assumed to take on the value of the containing object's CRS.DirectPositionList instances hold the coordinates for a sequence of direct positions within the same coordinate
reference system (CRS)."count" allows to specify the number of direct positions in the list. If the attribute count is present then
the attribute srsDimension shall be present, too.Vector instances hold the compoents for a (usually spatial) vector within some coordinate reference system (CRS).
Since Vectors will often be included in larger objects that have references to CRS, the "srsName" attribute may be missing.
In this case, the CRS is implicitly assumed to take on the value of the containing object's CRS.
Note that this content model is the same as DirectPositionType, but is defined separately to reflect the distinct semantics, and to avoid validation problems. SJDC 2004-12-02A geometric position represented either by a DirectPosition or a Point.A list of geometric positions represented either by a DirectPosition or a Point.Deprecated with GML version 3.1.0.Envelope defines an extent using a pair of positions defining opposite corners in arbitrary dimensions. The first direct
position is the "lower corner" (a coordinate position consisting of all the minimal ordinates for each dimension for all points within the envelope),
the second one the "upper corner" (a coordinate position consisting of all the maximal ordinates for each dimension for all points within the
envelope).deprecateddeprecated with GML version 3.0deprecatedDeprecated with GML version 3.1. Use the explicit properties "lowerCorner" and "upperCorner" instead.Deprecated with GML version 3.1.0. Use the explicit properties "lowerCorner" and "upperCorner" instead.Deprecated with GML 3.0 and included for backwards compatibility with GML 2. Use the "pos" element instead.Represents a coordinate tuple in one, two, or three dimensions. Deprecated with GML 3.0 and replaced by
DirectPositionType.Deprecated with GML 3.0 and included only for backwards compatibility with GML 2.0. Use "curveProperty" instead. This
property element either references a line string via the XLink-attributes or contains the line string element.This type is deprecated with GML 3 and shall not be used. It is included for backwards compatibility with GML 2. Use
CurvePropertyType instead. A property that has a line string as its value domain can either be an appropriate geometry element encapsulated
in an element of this type or an XLink reference to a remote geometry element (where remote includes geometry elements located elsewhere
in the same document). Either the reference or the contained element must be given, but neither both nor none.This attribute group includes the XLink attributes (see xlinks.xsd). XLink is used in GML to reference remote resources
(including those elsewhere in the same document). A simple link element can be constructed by including a specific set of XLink attributes.
The XML Linking Language (XLink) is currently a Proposed Recommendation of the World Wide Web Consortium. XLink allows elements to
be inserted into XML documents so as to create sophisticated links between resources; such links can be used to reference remote properties.
A simple link element can be used to implement pointer functionality, and this functionality has been built into various GML 3 elements by
including the gml:AssociationAttributeGroup.
