Draft for inclusion of surface textures and materials

spec/sections/12-geometry_topology_extension.adoc

@@ -181,3 +181,51 @@ Boolean query functions defined for the _RCC8_ relation family, along with their
 | ```geof:rcc8ntppi(geom1: ogc:geomLiteral, 
                 geom2: ogc:geomLiteral): xsd:boolean``` | `+(TTTFFTFFT)+`
 |===
+
+[#geometry_texture_extension]
+== Geometry Texture Extension
+
+This clause establishes the _Geometry Texture Extension_ parameterized Requirements class with base IRI `/req/geometry-texture-extension` which defines the integration of materials decorations and textures for solids, i.e., 3D geometries with enumerable surfaces.
+
+
+=== Textures
+
+At first, the necessary classes and properties as extensions to the GeoSPARQL ontology are defined.
+
+The class geo:Texture, defines a texture image, which may be associated with one or many surfaces described by the GeoSPARQL vocabulary.
+
+[#geo:Texture]
+
+[#req_geometry_texture_extension_texture_class]
+|===
+| *Req {counter:req}* Implementations shall allow the RDFS class geo:Texture to be used in SPARQL graph patterns.
+|<<#conf_geometry_topology_extension_texture_class>>
+|===
+
+The image may be associated using the property foaf:image and is represented as an xsd:anyURI Literal.
+
+The property geo:hasTexture, associated a geo:Geometry with a geo:Texture object.
+
+[#geo:hasTexture]
+
+[#req_geometry_texture_extension_hastexture_property]
+|===
+| *Req {counter:req}* Implementations shall allow the RDFS property geo:hasTexture to be used in SPARQL graph patterns.
+|<<#conf_geometry_topology_extension_hastexture_property>>
+|===
+
+=== Materials
+
+Materials are decorations of surfaces that consist of a color configuration. 
+
+[#geo:Material]
+
+[#req_geometry_texture_extension_material_class]
+|===
+| *Req {counter:req}* Implementations shall allow the RDFS class geo:Material to be used in SPARQL graph patterns.
+|<<#conf_geometry_topology_extension_material_class>>
+|===
+
+
+
+