Programmable object model for namespace or schema library support in a software application

A programmable object model allows a user to programmatically access and utilize a Namespace or schema library containing XML schema files and related XML-based resources for associating the schema files and XML-based resources with one or more documents and for customizing the functionality associated with the schema files and XML-based resources. The programmable object model also allows the user/programmer to remove schema files and other XML-based resources from association with previously associated documents.