gml:MultiGeometry 

gml:MultiGeometry is a collection of one or more GML geometry objects of arbitrary type. 
The members of the geometric aggregate may be specified either using the "standard" property (gml:geometryMember) or the array property (gml:geometryMembers). It is also valid to use both the "standard" and the array properties in the same collection.

Element Information

Model

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

Attributes

QName Type Fixed Default Use Inheritable Annotation
aggregationType gml:AggregationType optional
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

Source 

<element name="MultiGeometry" type="gml:MultiGeometryType" substitutionGroup="gml:AbstractGeometricAggregate">
  <annotation>
    <documentation>gml:MultiGeometry is a collection of one or more GML geometry objects of arbitrary type. The members of the geometric aggregate may be specified either using the "standard" property (gml:geometryMember) or the array property (gml:geometryMembers). It is also valid to use both the "standard" and the array properties in the same collection.</documentation>
  </annotation>
</element>

Sample