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The <classname>ExtensionProperyGroup contains the properties (elements and relationships) of the Extension. The
The <classname>ExtensionType element is generated as a XMLSchema <complexType.> and extends base type aixm:AbstractExtensionType.
The <classname>Extension element is generated as a XMLSchema <element>. The Extension element cannot stand alone, it may only exist as an extension to an AIXM base element. The Extension element does not have a timeslice. The Extension element attribute substitutionGroup is the substitutionGroup of the base type extension. Extension elements are not extensible.
The <classname>Extension element is generated as a XMLSchema <element>. The Extension element cannot stand alone, it may only exist as an extension to an AIXM base element. The Extension element does not have a timeslice. The Extension element attribute substitutionGroup is the substitutionGroup of the base type extension. Extension elements are not extensible.
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