Manipulating xsd schemas through java api

Hi,
I am working on an aplication that requires on-line creation of new xsd schemas. I am looking for a package that will allow me to create such schemas (i dont want to have to understand all the schema logic myself and create just a regular xml document).
I also require a way to be able to easily extract restrcitions regarding certain elements in the schema (i need to be able to answer questions such as what restrictions does X node have).
Does anyone happen to know of a package that may help me?
thanks!
shahar

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