Database handle for the object. It is of XML type ID, so is constrained to beunique in the XML document within which it occurs. An external identifier for the object inthe form of a URI may be constructed using standard XML and XPointer methods. This is doneby concatenating the URI for the document, a fragment separator, and the value of the idattribute.
<complexType name="ShellType"><annotation><documentation>Extended type based on AbstractVolumeType. Adds elements for shell type definition.</documentation></annotation><complexContent><extension base="diggs:ShellBaseType"><sequence><element minOccurs="1" ref="diggs:surfaceMembers"/><element minOccurs="0" name="uncertainty" type="diggs:UncertaintyPropertyType"><annotation><documentation>The uncertainty property.</documentation></annotation></element></sequence><attributeGroup ref="gml:AggregationAttributeGroup"/></extension></complexContent></complexType>