This commit fixes several issue connected with the use of
the <include> directive:
First and foremost the XSLT chain was broken in a way that
the include XSLT in combination with the PrettyPrinter XSLT
were called not in the chain of stylesheets but together.
This results in XML descriptions which duplicated the content
and went invalid
Another change is, when the include XSLT is called in the chain.
This commit moves it to become the very first processing
instruction such that the included data is part of all subsequent
XSLT stylesheets. This also allows to use older schema versions
in included XML data and they get automatically converted through
the chain of XSLT stylesheets.
Last change is the evaluation of the from= attribute value. This
value is now interpreted as an URI. Currently only local URIs are
supported. The reason to do this is because XSLT when processing
a document resolves relative paths according to the file path
of the master document. As kiwi does not change the original
content that path with will be a /var/tmp location if one of
the XSLT stylesheets were used. The documentation for this change
was updated as well
9cb68abcea