The xml.xsd file provided by W3C describes the XML namespace, in a form suitable for import by other schema documents.
Used for implementing validation of the the XML schema.
The sources can be found in qt5/qtxmlpatterns/src/xmlpatterns/schema/schemas/xml.xsd.
Copyright © 2007 W3C® (MIT, ERCIM, Keio, Beihang)
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