RE: html to dsssl ?

Hi Carlos,

Carlos said:
I was wondering if it is possible to link jade with something like
PHP3. Actually, I don't know much about PHP3, but it looks like it
may implement this template mechanism.

Didier Says:
What is PHP3? Do you have a link that points to more information?

About mixing Templates and styles:
This is an idea I am juggling right now. So the timing is right for your
comment. As we all know, a DSSSL document is a SGML document. In the case of
OpenJade, you can just include the DocType and have only a DSSSL script
without the Style markups.

We learned about the template mechanism from different languages like:
- ASP
- JSP
- XSL
- Balise dual prism

There are maybe others, but I personally know only these languages. All
share a common characteristic, they are template based. In the case of XSL
and Balise Dual Prism they are both template based and Style based.

We have several ways to implement templates in OpenJade:

a) a SGML rule template construct:
--------------------------------------------

<rule-template match="...a path">
 <html>
 <body>
<process-children>
</body>
 </html>
</rule-template>

In this case, the template construct is like the XSL template construct.
However, to make it more versatile we could declare that the content is of
CDATA. This way, we can generate any kind of output like Tex or RTF or
whatever is character based. A more restrictive rule would be to declare the
content as PCDATA and then have it parsed. In the example above, the
<process-children> element is a reserved element. The overall idea in this
case is that we have a template rule element like found in XSL.

b) a SGML document template:
---------------------------------------------
<style-specification>

<document-template>
<speechml>
<sentence tone="medium", voice="female">
What about a template for spoken document?
</sentence>
<process-style id="DSSSL_script">
</speechml>
</document-template>

<style-specification-body id="DSSSL_script">
(element par
   (make paragraph
      (process-children)
  )
)
</style-spcification-body>

</style-specification>

In this case, the template is the output document. Within a document
template, we can refer to style elements. This way, a style document would
contain both one or more DSSSL scripts uniquely identified by IDs and a
document template. A document template could refer to a DSSSL style script
by the <process-style....> reserved element.

The more, I think about this issue, the more I think that the solution is to
see a DSSSL style document as a SGML document and add to it new elements
allowing template processing. Even more, we could also open the door to
other script languages by having the style-specification-body set by default
to the actual DSSSL language but also if it could be set to other languages
like Python , PERL or JavaScript. In this case we would have the element
style-specification-body as <style-specification-body language="Python"> and
the body expressed in Python.

these are just ideas that needs to be discussed to gain more maturity.

In my own opinion, the key to include new constructs like templates is to
look at style document as a SGML document first.

PS: the good point about having a template based construct like XSL is that
SGML documents could be processed as well as XML documents. Do not forget
that XSL is intended for XML documents not for SGML documents (off course
some may say that it is possible that a XSL processor could do SGML
processing - Off course everything is possible under this sun :-)
nonetheless, it is not very probable that a XSL processor would parse SGML
documents). We may not have to copycat XSL, but take the best from it and
adapt it to a larger target language SGML (which, as you know also includes
XML).

regards
Didier PH Martin
mailto:martind@xxxxxxxxxxxxx
http://www.netfolder.com


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