Metacat

updated the URL given the new <returnfield> paramet

Folded the functionality from DBSAXDocument into the DocumentImpl class.
Now DocumentImpl handles both the reads and the writes to the database.
Eventually, it will implment the full DOM Document interface. Eliminated
the DBSAXDocument.java file as it is no longer relevant....

Updated the readxml shell script to use the new DocumentImpl class instead
of the old DBReader class.

Removed DBReader.java because the functionality of that class has been
replaced by the more efficient DocumentImpl class.

Created new class "DocumentImpl" which represents an XML Document. This
document will eventually implment the DOM Document interface. For now,
it implments all of the functionality that was present in DBReader, plus
cuts down on the number of database calls required to read a document. And...

Added script to register document types in the xml_catalog table for our
common public ID's.

Added install feature for copying dtd's to the servlet directory so that
they are accessible to the metacatservlet.

Added new utility query to return all of the xml_nodes info for a given
document id in metacat.

Updated documentation for NodeComparator.java.

Modified the DBReader and ElementNode classes to more efficiently read
documents from the database. In the old implementation, a db connection
was opened for each and every node in a document, recursively fromthe root
node. In the new implementation, all of the data from xml_nodes is...