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[Gzz] A public demo of the HTTP gateway can be found at: PEG: Alter Canv
From: |
Benja Fallenstein |
Subject: |
[Gzz] A public demo of the HTTP gateway can be found at: PEG: Alter Canvas2D vocab to support transclusions |
Date: |
Thu, 03 Jul 2003 03:02:32 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3.1) Gecko/20030618 Debian/1.3.1-3 |
==================================================
PEG: Alter Canvas2D vocab to support transclusions
==================================================
:Authors: Benja Fallenstein
:Date-Created: 2003-07-03
:Last-Modified: $Date: 2003/04/25 12:29:33 $
:Revision: $Revision: 1.2 $
:Status: Incomplete
:Scope: Minor
:Type: Interface
The Canvas2D vocabulary (``http://fenfire.org/rdf-v/2003/05/canvas2d``)
specifies properties and classes for placing things on 2D canvases.
This vocabulary does not, however, take into account that
a node's coordinates on some paper are not properties of that node;
e.g., when we have a node "The Fenfire system," then this system
does not have x coordinate 145 and y coordinate -32; rather, a
rendition of the node representing the Fenfire system is placed
at these coordinates.
The failure of taking this into account means that there cannot
be transclusions of a node, i.e. one node cannot be placed
on multiple papers; in Fenfire, transclusion must be supported
for *anything*, i.e., whenever some thing is in a "context,"
it must be possible to place it in more than one context.
In order to make nodes transcludable, the vocabulary
must be changed.
Issues
======
- Should the definition of the existing namespace be changed,
or should we create a new namespace?
RESOLVED: New namespace. Three out of four URIs in the
namespace cannot be used with their existing definition
(and changing the definition of an existing URI is
bad practice); retaining the last URI (``#Canvas``)
simply isn't worth it.
- Do we need a converter?
RESOLVED: As save/load hasn't worked for FenPDF so far,
we can expect that nobody has data in it yet; unless
somebody speaks up, we'll assume we need no converter.
Changes
=======
Create a new namespace,
``http://fenfire.org/rdf-v/2003/07/canvas2d-bis``,
containing the following names and definitions:
``http://fenfire.org/rdf-v/2003/07/canvas2d-bis#Canvas``
The RDF class of spatial 2D canvases.
Canvases contain (with the ``#contains`` property)
node transclusions, which may have the ``#x`` and ``#y``
properties, depending on the type of canvas.
``http://fenfire.org/rdf-v/2003/07/canvas2d-bis#NodeOnCanvas``
A transclusion of a node onto a canvas. This represents
one instance of a node on a specific canvas. The node
transcluded is related to this node through the
``#transcludes`` property.
Having this is necessary so that a single node can be
placed on more than one canvas.
``http://fenfire.org/rdf-v/2003/07/canvas2d-bis#contains``
A property relating a canvas to the node transclusions
it contains.
:Domain: ``#Canvas``
:Range: ``#NodeOnCanvas``
:Cardinality: ``1:n``
``http://fenfire.org/rdf-v/2003/07/canvas2d-bis#transcludes``
A property relating a transclusion to the node it is
a transclusion of.
:Domain: ``#NodeOnCanvas``
:Range: ``#Resource``
:Cardinality: ``n:1``
``http://fenfire.org/rdf-v/2003/07/canvas2d-bis#x`` and
``http://fenfire.org/rdf-v/2003/07/canvas2d-bis#y``
The x and y coordinates of a node on a canvas.
(node, x, literal), where the literal is parseable
as a floating-point number (similar to Java doubles).
Note that these are the *default* coordinate
properties: later on, we might make it possible for a Canvas2D
to define its own coordinate attributes, which would take
use close to Ted's floating world ideas.
Change ``org.fenfire.vocab.CANVAS2D`` to use this namespace.
Make the necessary changes in the other code so that the
rules of this namespace are respected.
\- Benja
- [Gzz] A public demo of the HTTP gateway can be found at: PEG: Alter Canvas2D vocab to support transclusions,
Benja Fallenstein <=
- [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Benja Fallenstein, 2003/07/02
- Re: [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Matti Katila, 2003/07/03
- Re: [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Benja Fallenstein, 2003/07/03
- Re: [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Matti Katila, 2003/07/06
- Re: [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Benja Fallenstein, 2003/07/06
- Re: [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Asko Soukka, 2003/07/06
- Re: [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Benja Fallenstein, 2003/07/06
- Re: [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Asko Soukka, 2003/07/07
- Re: [Gzz] REPOST: PEG: Alter Canvas2D vocab to support transclusions, Tuomas Lukka, 2003/07/08