api-doc-tools
                                
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                        Add XSD to all monodoc XML as they are generated
The root element of the monodoc XML should specify the monodoc-ecma.xsd:
<Type Name="Foo" FullName="Bar.Foo" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://github.com/mono/api-doc-tools/mdoc/Resources/monodoc/1.0/monodoc-ecma.xsd">...</Type>" 
(I am not sure about best practice for the schema. I think it's something like the above: $"{base}/{schemaname}/{semantic MAJOR.MINOR}/{xsdfile}" but I may be wrong.)
Github asks you to avoid linking directly to files for "production" use ... so if we were going to do this, we'd want to host these XSD files somewhere.