extensible metadata schema

[Praveen Peddi <pp...@contextmedia.com>]

Hi all,
I work for a company that does an asset metadata integration from different content management systems. We currently have an extensible schema where one can add/remove metadata fields in the schema on the fly. Now my problem is to take the input (mostly name value pairs) from any client and build the xml document which should be valid against the schema. Since the schema is fully extensible, the system doesn't know about it in advance. 

Now, my question is whats the best way to build the xml document from the input, that should be valid against the schema. Is there a better way where I can parse the schema and build the xml document based on that.

Is there any API available to parse the schema and understand the schema attributes etc...


Praveen