Merged in substantial changes to DBWriter and associated classes and tothe MetaCatServlet in order to accomodate the new UPDATE and DELETEfunctions. The command line tools and the parameters for theservlet have changed substantially.
Fixed bug in DBWriter using the new SAX2 interface. Turned out it was a bug in xerces-1_1_1, which was fixed by Andy Clark after I reported it.
1) Simplified database connection creation by adding new utility routine in MetaCatUtil that reads configuration information from the properties file.2) Created MetaCatUtil.getOption() to retrieve options from properties file.3) Unified SAX Parser creation by specifying parser driver in the properties file and dynamically loading it using the XMLReaderFactory interface....
cleaned up code for getting options from the properties file, made the database connection inthe MetaCatUtil class use the properties file for the conneciton info
updated javadoc documentation
integrated new structured query facility (DBQuery) into the servlet demo (MetaCatServlet)
removed debugging code
fixed QuerySpecification to produce SQL that does UNION or INTERSECT set operations for query group combinations
finsihed basic functionality for structured queries based on the DBQuery and QuerySpecification classes
added code to build an index of the paths through the DOM tree to each node in the tree as the node is being inserted
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