ISO/IEC JTC 1/SC34 N154

ISO/IEC JTC 1/SC34/WG2 N33

ISO/IEC JTC 1/SC34/WG2

Information Technology --
Document Description and Processing Languages
-- Information Presentation

TITLE: Requirements for Amendment 1 to DSSSL
SOURCE: SC34 Japan
PROJECT:
PROJECT EDITOR:
STATUS: for creating Amd1 to ISO/IEC 10179:1996
ACTION:
DATE: 2000-05-31
DISTRIBUTION: SC34/WG2 and Liaisons
REFER TO:
REPLY TO:

Requirements for Amendment 1 to DSSSL

Page-model structure rules for Page-sequence

[1] priority: of page-region and page-region-log

It is necessary to use priority of ports of page-region. It should also be added that page-region-spec include page-region-port-spec. Use of page-spec may be specified the following page-model structure rules:

  • page-spec ::=(page ( page-model-spec) )
  • page-model-spec ::=(page-model ( ... page-region-spec ... ) )
  • page-region-spec ::=(page-region ( ... page-region-port-spec ... ) )
  • page-region-port-spec ::=(page-region-port (port-number priority: )* )

Use of priority of ports for page-region should be gotton the following results:

  • The first priority content is processed and placed by the first priority port.
  • The next priority contents are processed and placed by escaping higher priority results.
  • The same priority contens are controled and placed by page-region-log.

Page-region-log is gotten the final result by port-organic-rule and moving-alignment-point.

Port-organic-rule is the following rules :

  • port-organic-definition ::=( definition ( port-organic-rule ) )
  • port-organic-rule ::=( organic-model-list )

Organic-model-list is free designed by users. Some basic model may be produced the following models:

  • directions-in-class
  • parallel-in-class
  • multi-language-directions-in-class

Moving-alignment-point is free designed by users. Some principle points may be produced. Reserved points are the following points :

  • starting-point
  • centering-point
  • ending-point
  • breaking-before-point
  • breaking-after-point

Moving of moving-alignment-point should be the following movings.

  • attach-moving
  • long-distance-moving
  • chaser-moving
  • escape-moving

[2] with-mode and with-modeless

The with-modeless should serve as expression. The with-mode on DSSSL is useful from expression point of view. The with-mode is "case" expression or "if" of it. In fact, "default-case" or "else-if" help to "case" or "if". Thus the with-modeless is informative for users' programming.

[3] any-element and without-element on SDQL

What is especially important is that select of elements should be not difficult to use for users.

any-element

( *any* element-A )

( ancestor-element-A *any* element-B )

without-element

( parent-element ( *without* without-element-list ) )

ex.) any-element and without-element

( ancestor-element-A *any* ( *without* without-element-list ) element-B )

[4] ISO-LISP (ISLISP)

DSSSL expression should open functions to use libraries of LISP and Scheme. It is no exaggeration to say that DSSSL is a great Scheme. It is ISO-LISP, or rather Scheme. Let us attempt to expand for DSSSL expression the following functions:

  1. side effect
  2. element attribute operation
  3. ratio number

[5] line-inside-area

It is necessary to add the line-inside-area to the concept on DSSSL. DSSSL areas should be explained display-group, inline-area, attachment-area and line-inside-area for users.

The line-inside-area is expressed in alignment-point, emphasizing-mark, glyph-annotation flow object class.

[6] Clarify the relation with DSSSL and XSL

Extend DSSSL to contain XSL as its subset.

[7] Core Query Language

Core Query Language is not powerful enough to handle practical issues. It should be extend to include the following procedures.

  • Procedures of List Operation [10.2.2]
  • Procedures of Generic Property Operation [10.2.3]

.