[xsl] XML Preprocessing and XSLT Processing Models

XSL Working Group,
Argumentation Community Group,

Greetings.  There has been interest in dynamic or parameterizable XSLT imports 
and includes.  XML preprocessing, XML macros 
(https://www.w3.org/community/argumentation/wiki/XML_Macros) and XSLT-enhanced 
XML includes 
(https://www.w3.org/community/argumentation/wiki/XSLT-Enhanced_XML_Include), 
facilitates such expressiveness.

For example:

<define>
  <schema xmlns="http://www.w3.org/2001/XMLSchema";>
    ...
  </schema>
  <transform xmlns="http://www.w3.org/1999/XSL/Transform";>
    <template match="...">
      ...
      <element name="include" namespace="...">
        <attribute name="href" namespace="...">
          <value-of select="..." />
        </attribute>
      </element>
      ...
    </template>
  </transform>
</define>

such that:

<xmlmacro href="file1.xslt">
  <xmlmacro href="file2.xslt">
    <xmlmacro href="file3.xslt">
      ...
    </xmlmacro>
  </xmlmacro>
</xmlmacro>

describes and expands into a structure as per iterative processing.

XSLT processing models are topical to XML preprocessing and, in addition to 
heuristics from other preprocessing models, advanced functionalities are 
possible from parallel processing, where each processing context is as a 
concurrent thread and can access a document object model, including traversal 
between macros and includes and macro expansions and included content, and 
where concurrent processing contexts can exchange messages.  Such concurrency 
facilitates advanced scenario, e.g. layout or rendering engine logic and 
grammatical processing scenarios such as the grammatical framework.

For those interested, the topics pertain to: preprocessing 
(http://en.wikipedia.org/wiki/Preprocessor), rewriting systems 
(http://en.wikipedia.org/wiki/Rewriting), string rewriting systems 
(http://en.wikipedia.org/wiki/String_rewriting_system), term rewriting systems 
(http://en.wikipedia.org/wiki/Rewriting#Term_rewriting_systems), graph 
rewriting systems (http://en.wikipedia.org/wiki/Graph_rewriting), Lindenmayer 
systems (http://en.wikipedia.org/wiki/L-system), parallel rewriting systems, 
process calculi (http://en.wikipedia.org/wiki/Process_calculus) and trace 
theory (http://en.wikipedia.org/wiki/Trace_theory).

Also topical to macro expansion is outputting multiple subtrees and such that 
concurrent processing contexts can output @xref attributes referencing elements 
between subtrees:

<macroexpansion>
  <subtree1>
    
  </subtree2>
</macroexpansion>



Kind regards,

Adam Sobieski                                     
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