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   Re: WD of XSL requirements released

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  • From: len bullard <cbullard@hiwaay.net>
  • To: xsl-list@mulberrytech.com, xml-dev@ic.ac.uk
  • Date: Thu, 14 May 1998 22:29:38 -0500

My favorite part: "Easy things should be easy."


"Absolute/relative positioning, Layering, and Transparency 
... Z-order for overlapping areas"

Does this include creating 3D objects such as indexed face 
sets, graphic primitives, or only layering?

"Animation:  support for identifying and including encapsulated,
animated objects."

Loose.  Traditionally, that is a client plugin.  I understand 
the idea, but avi, VRML, gif89 are all animation and very different 
environments.  Animation can be a hub (eg, VRML anchors) so, an 
example here would be appreciated.

"Callouts:  Linking hotspots to items in the flow of text. Another 
aspect would be manipulating presentation of text within a CGM

Callouts?  From the IETM community, I understand why 
you want this, but it is an application content type and should 
be defined in the DTD, not the style language although the style
specifies the rendering.  The CGM example seems odd since 
that is a presentation language with text primitives.  Why are you 
you are applying XSL style rules to CGM text types?  Just curious.

"Tables:  Support for the table models of CSS and DSSSL. Ability to 
easily format popular source table models such as HTML and CALS."

Vague.  Is this interpreted that 

1. XSL processors shall always 
process CSS and DSSSL table models to a 
feature set TBD

2.  XSL processors may optionally support HTML 
and CALS table models

"Data Types:  Scalar types, units of measure, Flow Objects, XML Objects"

What are XML Objects?


Ok.  This appears to limit XSL to transforms.  If so, 
architecturally, how do scripting languages in the 
other categories relate to XSL?  The "out of scope" 
requirements are hard to interpret in light of current 
scripting practice, eg, inline JavaScript. 


What are audio stylesheets?

What are "accessibility mechanisms"?

"Persistent headers/footers w/scrolling body:  ability to specify 
headers and/or footers that should be fixed at the borders of a 
scrolling text area. This would provide the functionality most 
commonly achieved with frames in HTML browsers today."

Loose.  Frames also encapsulate plugins which are active 
hubs.  This feels like WinHelp, not an Internet browser, 
so I am wondering what "functionality most commonly 
achieved" is indicated, ie, just scrolling?


Overall, very good start.   It appears to be a 
good sampling of all of the necessary techniques.  

Len Bullard

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