- From: Story Henry <henry.story@bblfish.net>
- Date: Tue, 9 Dec 2008 00:11:54 +0100
- To: Toby A Inkster <tai@g5n.co.uk>
- Cc: Semantic Web <semantic-web@w3.org>

Hehe. Cool, but I don't know if you need to make a new class for three dimensional points. All points are 0 dimensional, see http://blogs.sun.com/bblfish/entry/the_10_dimensions_of_reality On the other hand yes, I can see that if you are using euclidian geometry you may need specific euclidian x, y, z coordinates. Those differ from the x, y relations of geo coordinate space, which occurs on the surface of a sphere. Unless of course you mean the same :x and :y relations as the geo ontology ones, and so that the z is the height of the point. I am not sure what the importance of the reference plane is otherwise. Usually you have a reference point the Origin of your coordinate system. You also need a unit lenght, but I suppose we have that with meters. Henry On 9 Dec 2008, at 00:00, Toby A Inkster wrote: > > Does anyone know of such a thing? Basically I want something like: > > :Point a rdfs:Class ; > rdfs:comment "A point in three dimentions"@en . > :x a rdfs:Property ; > rdfs:domain :Point ; > rdfs:range xsd:decimal . > :y a rdfs:Property ; > rdfs:domain :Point ; > rdfs:range xsd:decimal . > :z a rdfs:Property ; > rdfs:domain :Point ; > rdfs:range xsd:decimal ; > :plane a rdfs:Property ; > rdfs:domain :Point ; > rdfs:comment "The reference plane."@en . > > Effectively something like <http://www.w3.org/2003/01/geo/> but > operating on arbitrary 3D reference planes instead of just WGS84. > > -- > Toby A Inkster > <mailto:mail@tobyinkster.co.uk> > <http://tobyinkster.co.uk> > > > >

Received on Monday, 8 December 2008 23:12:41 UTC