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Q: 

Loading XHTML schemas to XmlSchemaSet

Hello,

I'm trying to load the XHTML schemas from the W3C site (xhtml - transitional, strict & frameset) which I'm having to put into to an XmlSchemaSet. This is then used by a third party product in our application to show intelisense and validation. However when I try and "Compile" this XmlSchema set I get the following message:

The global element 'http://www.w3.org/1999/xhtml:html' has already been declared.

But I'm not sure how to get around this. I need to load all three (frameset, transitional and strict) as a third party product we use needs to validate the documents we edit and upload (its a CMS) as well as tokenise and display intelisense from the XSDs. We can't use an online validator either, they're basically modified with some additional syntax specific to our system (its namespaced) but even trying to load the stock XHTML schemas from the W3C site fails.

Am I doing something wrong here?

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