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<xsd:documentation>An identifier to indicate the data originator.
This identifies the server that originally created
the object and thus most of the uids in the object (but not
necessarily the uids of the parents). This is typically a url. </xsd:documentation>
<xsd:documentation>Last change of any element of the data at the persistent data store.
The change time is not updated for a growing object while it is growing. </xsd:documentation>