Re: [docbook-apps] NVDL, DocBook, and MathML

[George Bina <george@oxygenxml.com>]

Hi Bob,

Try adding an attach action on the MathML namespace. This will attach 
the content in MathML to the validation candidate triggered by the 
<validate schema="docbook.rng"/> action. Change the NVDL script as below:

<rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0"; 
startMode="docbook">
    <mode name="docbook">
        <namespace ns="http://docbook.org/ns/docbook";>
            <validate schema="docbook.rng"/>
        </namespace>
        <namespace ns="http://www.w3.org/1998/Math/MathML";>
            <attach/>
            <validate schema="../xsd/mathml3/mathml3.xsd"/>
        </namespace>
    </mode>
</rules>

Best Regards,
George
--
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com

On 09/02/16 02:33, Bob Stayton wrote:
> I'm having a problem trying to process DocBook 5 documents using NVDL in
> order to validate DocBook content that has MathML content within
> equation or inlineequation.  The DocBook validation side is failing, but
> only under NVDL.
>
> The DocBook rng schema for inlineequation is as follows:
>
>     <define name="db.inlineequation.content">
>        <choice>
>           <choice>
>              <oneOrMore>
>                 <ref name="db.inlinemediaobject"/>
>              </oneOrMore>
>              <oneOrMore>
>                 <ref name="db.mathphrase"/>
>              </oneOrMore>
>           </choice>
>           <oneOrMore>
>              <ref name="db._any.mml"/>
>           </oneOrMore>
>        </choice>
>     </define>
>
> This schema specifies either a) inlinemediaobject or mathphrase, or b)
> some MathML elements.  It *allows* MathML, but it does not validate it
> against the MathML DTD.  NVDL is capable of doing that.  But ...
>
> When I set up NVDL using a schema like this:
>
> <rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0";
> startMode="docbook">
>      <mode name="docbook">
>          <namespace ns="http://docbook.org/ns/docbook";>
>              <validate schema="docbook.rng"/>
>          </namespace>
>          <namespace ns="http://www.w3.org/1998/Math/MathML";>
>              <validate schema="../xsd/mathml3/mathml3.xsd"/>
>          </namespace>
>      </mode>
> </rules>
>
> This DocBook content validates against docbook.rng:
>
> <para><inlineequation>
>    <math xmlns="http://www.w3.org/1998/Math/MathML";>
>      ...
>    </math>
> </inlineequation></para>
>
> But when processed with NVDL, it fails with this message:
>
> Engine name: Jing
> Severity: error
> Description: element "inlineequation" incomplete; expected element
> "alt", "inlinemediaobject" or "mathphrase" or an element from another
> namespace
>
> I think what is happening is that Jing has sent the <math> element to be
> validated against the MathML schema, and then it sends the remains of
> the inlineequation element to be validated against the DocBook schema.
> But now inlineequation is empty, and fails validation.
>
> I find if I insert an empty <mathphrase> inside inlineequation, then I
> can work around this error.  Does anyone have any other ideas? That is,
> short of customizing the docbook equation elements to allow them to be
> empty.