discuss issue #156 docbookxi doesn't support XInclude 1.1

https://github.com/docbook/docbook/issues/156
This
issue actually has three requests in it, which are independent
of each other.  For reference, here are links to the two W3C
documents:
XInclude
1.0:
https://www.w3.org/TR/xinclude/
XInclude
1.1:
https://www.w3.org/TR/xinclude-11/
1.
It's missing
the fragid attribute.
This
attribute was added in XInclude version 1.1, and should be
supported.
2.
The DocBook
schema for XInclude also forbids href=
which is a bug.
Indeed,
the W3C document describes the behavior of href=
as
equivalent to a missing href attribute, which is to be treated
as a reference to the current document.
3.
We thought
of XInclude as structural (chapters, sections), but maybe we
should allow it anywhere, including in inlines.
Comments?

--
Bob Stayton