6. The method of claim 5 , where configuring the abstraction layer includes storing metadata of the document and a reference of the document into one or more document description data fields of the database, where storing the reference of the document includes storing a location of the document in the document repository in one of the document description data fields.
7. The method of claim 6 , where configuring the abstraction layer includes creating a document catalog defined using a predefined or configurable schema.