How do I build an .xsd file from xml?

Is there a way to generate an xsd from an xml file? Are there any class files that do this? I don't mind if the solution is 开发者_C百科c# or java.

I would like to do this in code, but if there are any good free tools that would be ok too.

Thanks

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xsd.exe can do what you want:

If you specify an XML file (.xml extension), Xsd.exe infers a schema from the data in the file and produces an XSD schema. The output file has the same name as the XML file, but with the .xsd extension.

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Try xsd command better explained at XML Schema Definition Tool (Xsd.exe)