Hi biqll,
Indeed, it looks like the schema validator we use (MSV) "doesn't like" fixed=" 123" (where the value starts with a space). Is this really something you really need? If you do and assuming it is valid in XML Schema, I think the way to go would for you to fix this in the MSV code, and we're not likely to look into such corner case in a library we use. If you decide to go this route, feel free to do a pull request against this fork of MSV we're using:
https://github.com/orbeon/msvAlex
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