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Re: ANNOUNCEMENT: RDFStyles: alternative to XSLT for RDF

From: Reto Bachmann-Gmuer <reto@gmuer.ch>
Date: Fri, 24 Oct 2003 12:34:42 +0200
Message-ID: <3F990042.1020100@gmuer.ch>
To: Emmanuel Pietriga <epietriga@yahoo.fr>
Cc: Dominique HazaŽl-Massieux <dom@w3.org>, www-rdf-interest@w3.org

Hash: SHA1

I like GSS, thanks for pointing me to it!

Particularly I would like to integrate the selector design in RDFStyles.
More perspectively I think that a styling vocabulary that allows setting
CSS/FO/SVG properties (GSS) and allows to define how the styled resource
should be serialized to HTML,XSL:FO or SVG would be possible and useful.

I think two incompatible point in the approaches are:
- - GSS if for rendering whole models, RDFStyles for rendering a Resource
(expanding its properties). I've chosen this approach to avoid the
problem of determining the root in (circular or multi-trees) models and
because I guess that it is more applicable to distributed models (only
queries for statements with a defined subject)
- - An RDFStyles is a Resource (containing a sequence of renderers
(=templates)) not a model. With this it is possible to determine the
priority of (conflicting) renderers and, more important, I think that i
should always be possible to merge two models without loosing
information so I avoid (implicit) references to the model containing a


Emmanuel Pietriga wrote:

| Dominique HazaŽl-Massieux wrote:
|> Le lun 20/10/2003 ŗ 14:17, Reto Bachmann-Gmuer a ťcrit :
|>> I'm trying to develop a tool for rendering RDF-Resource to text based
|>> formats such as HTML or XML.
|>> The first alpha-implementation written in java is available for
|>> download at:
|>> http://prdownloads.sourceforge.net/knobot/wymiwyg-rdfstyles.zip?download
|>> The rdf-schema can be found at:
|>> http://wymiwyg.org/ontologies/rdfstyles.rdf
|> Unless I misunderstood, this is very close to GSS, an RDF style sheet
|> language used by Isaviz:
|> http://www.w3.org/2001/11/IsaViz/gss/gssmanual.html
|> It would be interesting to see the two projects work together on this.
| The current version of GSS (which is an RDF-based stylesheet language
| for styling RDF) is aimed at styling node-link representations of RDF
| graphs using CSS and SVG properties. So it's not addressing exactly the
| same issue, but there is clearly an intersection between the two.
| Some precisions about GSS:
| GSS also has a cascading mechanism.
| The selector language defined by GSS is somewhat inspired from the RDF
| reification mechanism, so it tends to be verbose, and I'm not really
| happy with it (hopefully, the graphical front end for creating GSS
| stylesheets should hide the complexity of selectors). But GSS would
| clearly benefit from an XPath-like RDFPath language.
| As far as the execution model is concerned, we can draw a (loose)
| parallel with XSLT: the GSS engine walks the entire graph (nodes and
| arcs) and tries to match them with the selectors defined in the
| stylesheet. Styling instructions associated with matching selectors are
| executed on the current node (or arc). Note that there is no mechanism
| similar to apply-templates yet as it is less obvious in the context of a
| graph structure. If several selectors are match the current node, there
| is an XSLT/XPath-inspired algorithm for computing the "longest match",
| meaning that the most specific selector is applied (*).
| (*) actually, it is somewhat more complex than that, as the less
| specific selectors might still have some effect if they set a styling
| property that has not been defined by more specific selectors.
| I still have to catch on this RDFStyles thread, but I would be glad to
| look further if we can collaborate on this.
| Note: Ryan Lee has written an OWL Schema for GSS, available at [1]
| (informal Notation 3 version at [2]), and as Dominique pointed out,
| there is more information about IsaViz and GSS at [3] and [4].
| [1] http://www.w3.org/2001/11/IsaViz/graphstylesheets
| [2] http://www.w3.org/2001/11/IsaViz/graphstylesheets-informal.n3
| [2] http://www.w3.org/2001/11/IsaViz/
| [3] http://www.w3.org/2001/11/IsaViz/gss/gssmanual.html
| Emmanuel
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Received on Friday, 24 October 2003 06:37:26 GMT

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