A proxy entry in a dictionary of definitions. An element of this type contains a reference to a remote definition object. This entry is expected to be convenient in allowing multiple elements in one XML document to contain short (abbreviated XPointer) references, which are resolved to an external definition provided in a Dictionary element in the same XML 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="DefinitionProxyType"><annotation><documentation>A proxy entry in a dictionary of definitions. An element of this type contains a reference to a remote definition object. This entry is expected to be convenient in allowing multiple elements in one XML document to contain short (abbreviated XPointer) references, which are resolved to an external definition provided in a Dictionary element in the same XML document.</documentation></annotation><complexContent><extension base="gml:DefinitionType"><sequence><element ref="gml:definitionRef"><annotation><documentation>A reference to a remote entry in this dictionary, used when this dictionary entry is identified to allow external references to this specific entry. The remote entry referenced can be in a dictionary in the same or different XML document.</documentation></annotation></element></sequence></extension></complexContent></complexType>