Update dataset document which host is not in this metacat will cause an error
If a data package was created by a morpho in metacat epsilon and it was forced
replicate from metacat epsilon (its homeserver) to metacat pine. Then same
user use a Mophor point to metacat pine and can find this data package. If the
user try to update the dataset document will cause an error:
The root element is required in a well-formed document.
Howerver you can update other xml documents such as access, physical documents
in the same package successfully.
If user create a new data package in metacat pine and he can update dataset
xml document successfully.