Subject: Re: Design for (interactively) customizable DSSSL stylesheets From: James Clark <jjc@xxxxxxxxxx> Date: Sat Mar 29 03:38:35 1997 EST |
At 11:05 28/03/97 -0500, Paul Prescod wrote: >I think that James' idea would work fine as the DSSSL equivalent. It >isn't clear to me where he is proposing the *parameter values* of those >parameters should go: on a command line, in a %usermods;, in a file >pre-pended to the DSSSL script? It matters, because it would change how >the script itself is written: > >Does it need to import %usermods;? >Does it need to be missing a DOCTYPE so that the relevant values can be >prepended? >Is it rather a fully valid DSSSL spec. with "default values" in a >special section that is erased and changed? >Is it a fully valid DSSSL spec *except* that certain things are not >defined? The customization would go in a separate file like this: <!doctype style-sheet PUBLIC "-//James Clark//DTD DSSSL Style Sheet//EN" [ <!entity base system "docbook.dsl" cdata dsssl> ]> <style-specification use=x> (define %visual-acuity% "large-type") </style-specification> <external-specification id=x document=base> I think this sort of approach could be extended to allow a user friendly style-sheet creation mechanism. You would have a hand-written library of DSSSL definitions. These would include: - - procedures that can be used on the RHS of construction rules (things like $component$ or $paragraph$ in Jon's Docbook style sheet) - - definitions of variables that are used by those procedures - - procedures for numbering, cross-referencing and so on Associated with this library would be a library description encoded in SGML or XML which would describe the procedures and variables provided by the library in a manner which would allow a style sheet editor to provide a user friendly interface for creating a stylesheet that used the library. The stylesheet created (and edited) by the stylesheet editor would have a very restricted format: it would override variable definitions in the library, and it would have element rules whose construction rules just called procedures in the library. James
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