[boost] Boostbook doesn't not work with libxslt 1.1.35

[Giovanni Mascellani via Boost]

Hi,

it seems that Boost fails building boostbook docs if xsltproc and
libxslt1 version 1.1.35 is installed (it works with version up to 1.1.34).

Specifically, I can reproduce the failure following these steps:

* recursively clone g...@github.com:boostorg/boost.git

* ./bootstrap.sh

* echo "using boostbook ;" > user-config-doc.jam

* ./b2 -j32 -q -d2 --ignore-site-config --enable-index
--user-config=user-config-doc.jam --build-dir=build-doc

* ./b2 -j32 -q -d2 --ignore-site-config --enable-index
--user-config=user-config-doc.jam --build-dir=build-doc doc

On my Debian unstable system this works when xsltproc and libxslt1.1
version 1.1.34 are installed, but fails when 1.1.35 is installed, with
the following error:

"xsltproc" --stringparam boost.defaults "Boost" --stringparam boost.root
"../../../.." --path "build-doc/boost/bin.v2/libs/logic/doc/docbook"
--xinclude -o
"build-doc/boost/bin.v2/libs/logic/doc/docbook/tribool.docbook"
"/<<PKGBUILDDIR>>/tools/boostbook/xsl/docbook.xsl"
"/<<PKGBUILDDIR>>/libs/logic/doc/tribool.boostbook"
runtime error: file /<<PKGBUILDDIR>>/tools/boostbook/xsl/annotation.xsl
line 432 element element
xsl:element: The effective name '' is not a valid QName.
runtime error: file /<<PKGBUILDDIR>>/tools/boostbook/xsl/annotation.xsl
line 432 element element
xsl:element: The effective name '' is not a valid QName.runtime error:
file /<<PKGBUILDDIR>>/tools/boostbook/xsl/annotation.xsl line 432
element element
xsl:element: The effective name '' is not a valid QName.
[repeated many times]

Many different libraries are failing in the same way, so I guess that
the real problem is in boostbook. However I don't know enough of XSLT
and xsltproc to give a proper diagnosis.

For the context, this bug was discovered during a test rebuild of the
Debian package for Boost[1]. However it can be reproduced with master
doing the steps above.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1016321

Thanks in advance for any help you can provide, Giovanni.

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