ISO/IEC JTC 1/SC34 N154

ISO/IEC JTC 1/SC34/WG2

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

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]