gml:AbstractGeometryType 

All geometry elements are derived directly or indirectly from this abstract supertype. A geometry element may have an identifying attribute (gml:id), one or more names (elements identifier and name) and a description (elements description and descriptionReference) . It may be associated with a spatial reference system (attribute group gml:SRSReferenceGroup).
The following rules shall be adhered to:
-	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 AbstractGeometry.

Complex Type Information

Model

gml:metaDataProperty* , gml:description{0,1} , gml:descriptionReference{0,1} , gml:identifier{0,1} , gml:name*
Children: gml:description, gml:descriptionReference, gml:identifier, gml:metaDataProperty, gml:name

Attributes

QName Type Fixed Default Use Inheritable Annotation
axisLabels gml:NCNameList optional
gml:id ID required 
The attribute gml:id supports provision of a handle for the XML element representing a GML Object. Its use is mandatory for all GML objects. It is of XML type ID, so is constrained to be unique in the XML document within which it occurs.
srsDimension positiveInteger optional
srsName anyURI optional
uomLabels gml:NCNameList optional

Used By

Complex Types gml:AbstractGeometricAggregateType, gml:AbstractGeometricPrimitiveType, gml:GeometricComplexType, gml:GridType
Elements gml:AbstractGeometry, gml:AbstractImplicitGeometry

Source 

<complexType name="AbstractGeometryType" abstract="true">
  <annotation>
    <documentation>All geometry elements are derived directly or indirectly from this abstract supertype. A geometry element may have an identifying attribute (gml:id), one or more names (elements identifier and name) and a description (elements description and descriptionReference) . It may be associated with a spatial reference system (attribute group gml:SRSReferenceGroup). The following rules shall be adhered to: - 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 AbstractGeometry.</documentation>
  </annotation>
  <complexContent>
    <extension base="gml:AbstractGMLType">
      <attributeGroup ref="gml:SRSReferenceGroup"/>
    </extension>
  </complexContent>
</complexType>