Unique XML Case Scenario..suggestions required

I need few suggestions related to a unique case scenario with XML.I am having little XML programming experience with serverSide Java and XML.
From the end user point of view,I need to provide a web based GUI WITH JAVA APPLET or ActiveX to build
customized XML schema building environment from the business entities with
a simple drag and drop functionality of all entities on to the cANVAS.
After XML Schema creation,User may be intersted to add,modify,delete XMLdatafile and XSL file confirming to that XMLSchema.
also need to provide the functionlity for Add,Update Delete with a server side logic confirmed to that XMLSchema with native XML database .
all these XML(XSD,XML,XSLT) files have to be stored in native XMl database.
Do we have any open source implementaions on this similar case scenario.
Please come up with your expertized suggestions.

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