Gererate SharePoint entity class from xsd/xml

I am creating one SharePoint project and want to use entity class like generated in http://sitecollecmgmt.codeplex.com/SourceControl/list/changesets this projects ( Groups,Users and Roles helper class).Can anyone tell me how can I get SharePoint xsd开发者_StackOverflow中文版/xml to generate this type helper classes from xsd tool.

Thanks

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Download the XSD files and then run xsd /c schema1.xsd schema2.xsd ...