Matt,
We use MathML and XSLTPROC to process the Docbook. I have found out that
you need to add in some ENTITY statements into your customization. We do this
primarily because we put MathML in a separate XML file and then include
it.
<!-- MathML Definitions -->
<!ENTITY %
mathml-colon
':'>
<!ENTITY %
mathml-prefix
'mml'>
<!ENTITY %
mathml-math
'%mathml-prefix;%mathml-colon;math' >
<!ENTITY %
MATHML.prefixed
"INCLUDE">
<!ENTITY %
MATHML.prefix
"mml">
<!ENTITY %
equation.content
"(alt?,
(graphic+|mediaobject+|mathphrase+|%mathml-math;+|xi:include))">
<!ENTITY
% inlineequation.content "(alt?,
(graphic+|inlinegraphic+|inlinemediaobject+|mathphrase+|%mathml-math;+|xi:include))">
<!ENTITY
% NamespaceDecl.attrib "xmlns%mathml-colon;%mathml-prefix;
CDATA #FIXED 'http://www.w3.org/1998/Math/MathML' ">
<!ENTITY % mathml PUBLIC "-//W3C//DTD MathML
2.0//EN"
"http://www.w3.org/Math/DTD/mathml2/mathml2.dtd">
%mathml;
<!ENTITY %
local.equation.attrib
"align CDATA #IMPLIED">
<!ENTITY %
local.informalequation.attrib "align CDATA #IMPLIED">
-----------------
Then if you have a local copy of the DTD you will need to point to it in
your catalog
<public publicId="-//W3C//DTD MathML
2.0//EN"
uri="doctools/MathML2/mathml2.dtd"/>
or something like that. It sounds like you are not resolving the MML data
correclty which would probably be in your catalog.
Also, you may want to point to the standard current MathML DTD at W3,
but that it probably not your issue.
Regards,
Dean Nelson
In a message dated 3/15/2011 10:08:30 A.M. Pacific Daylight Time,
writes:
Hi
all,
We're trying to use mathml for some equations in some of
our xml docs
but we keep getting 'failed to load external entities'
errors.
mathmldb.dtd is installed locally but it doesn't seem to
matter.
Is it not possible to embed mathml within a docbook (book or
article)
file? Does it need to be its own file and then
xincluded?
The doctype def is:
<?xml version="1.0"
encoding="UTF-8" ?>
<!DOCTYPE book
PUBLIC
"-//OASIS//DTD DocBook MathML Module
V1.0//EN"
"http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd">
<book
id="xkbproto">
...
<informalequation>
<mml:math>
<mml:msup>
<mml:mfenced>
<mml:mi>a</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi>b</mml:mi>
</mml:mfenced>
<mml:mn>2</mml:mn>
</mml:msup>
</mml:math>
</informalequation>
... which caused the
following validation errors:
$ make
Making all in
specs
make[1]: Entering directory
`/home/fcarrijo/softwares/repositorio/xorg/proto/kbproto/specs'
GEN xkbproto.html
xmlto:
/home/fcarrijo/softwares/repositorio/xorg/proto/kbproto/specs/xkbproto.xml
does not validate (status 3)
xmlto: Fix document
syntax or use --skip-validation option
I/O error :
Attempt to load network entity
http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd
/home/fcarrijo/softwares/repositorio/xorg/proto/kbproto/specs/xkbproto.xml:4:
warning: failed to load external entity
"http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd"
"http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd">
^
/home/fcarrijo/softwares/repositorio/xorg/proto/kbproto/specs/ch04.xml:417:
namespace error : Namespace prefix mml on math is not defined
<mml:math>
^
Notes in libxml2 site point that "failed to load external
entity" refers
to a misconfigured XML Catalog, which I tried to fix
installing two other
packages...
docbook-mathml
w3-dtd-mathml
... and setting
XML_DEBUG_CATALOG=1 before building, according to [1].
The environment
variable set causes the build to output many more lines,
being these the
most relevant:
Trying system delegate
file:///etc/xml/docbook-xml.xml
Resolve URI
http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd
I/O error : Attempt to load network entity
http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd
warning: failed to load external entity
"http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd"
validity error : Could not load the external subset
"http://www.oasis-open.org/docbook/xml/mathml/1.0/dbmathml.dtd"
Document
/home/fcarrijo/softwares/repositorio/xorg/proto/kbproto/specs/xkbproto.xml
does not validate
Catalogs
cleanup
Do you guys have any suggestions?
[0]
http://www.docbook.org/specs/wd-docbook-mathml-1.1CR1.html
[1]
http://xmlsoft.org/catalog.html#validate
thanks,
Matt
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