>
> The file it's complaining about, introduction.xml, shouldn't actually end
> up in build/docbook/src, it should be inlined into
> build/docbook/src/userguide.xml. Can you have a look in
> build/docbook/src/userguide.xml, and check that is does not contain any
> <xi:include> elements?
>

It does contain <xi:include> elements.

Something might be a little weird with my setup as I also get this warning
everytime I run gradle:
WARNING: problem while setting JAXP validating property on SAXParser... XML
validation will not be done:
http://java.sun.com/xml/jaxp/properties/schemaLanguage

Although from my googling this looks like it might be an ivy error message.

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