Is it possible to flatten an XML Schema package in only one XSD file?

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I have an XSD package composed of two XSD files: let's say A.xsd and B.xsd. The schema A imports (not includes) the B schema. They have different namespaces.I need to use those schema in a system that doesn't work well with xsd:imports.So my question is: is it possible to flatten an XSD package in one and only one XSD file or is one XSD file per namespace the absolute minimum ?TIA,Georges