X3D Ontology for Semantic Web
The X3D Ontology for Semantic Web provides terms of reference for semantic query of X3D models.
Motivation | Availability | Design and Design Patterns | OWLDoc | Queries | References | Tools | TODO | Contact
Extensible 3D (X3D) Graphics is the royalty-free open standard for publishing, viewing, printing and archiving interactive 3D models on the Web.
The X3D Semantic Web Working Group mission is to publish models to the Web using X3D in order to best gain Web interoperability and enable intelligent 3D applications, feature-based 3D model querying, and reasoning over 3D scenes.
"The answer to your question is the response to the query." Jim Hendler and Dean Allemang
"Trying to use the Semantic Web without SPARQL is like trying to use a relational database without SQL." Tim Berners-Lee
"The proof of the pudding is in the eating." Wiktionary
To learn more about publishing 3D graphics on the Web, please see What is X3D? and X3D Version 4 Overview.
PREFIX x3do: <http://www.web3d.org/specifications/X3dOntology4.0#>
.x3dmodel from XML into
The current draft is reasonably stable as we work to make X3D models queriable in interesting ways. More work remains for the X3D Ontology. Expected progression, with adjacent steps typically in tandem:
.ttlrepresentations generated from X3DUOM.
https://www.web3D.org/semantics(website request pending).
DEFnames, if available, are prefixed by a colon. Example:
USEnames, if available, are adapted by prefixing with a colon and appending
-USE-and the number of current occurrence. Example:
Sceneare always singletons and so are eponymous and always get the same name, e.g.
X3Dnode. Example labels:
:meta_1_5had 1 for
headand 5 for fifth child;
:Shape_2_3_2_1has initial 2 for
Scenefollowed by third/second/first children nodes, and so on.
X3D Semantic Web Working Group efforts include defining use cases for queries and demonstrating examples, which will like follow three general patterns:
build.all.log.txt and build.SPARQL.query.tests.log.txt each provide a full set of queries and responses. These build logs help practitioners compare results and track progress (or setbacks).
|SPARQL Query||Graph (triple store)||Response||Description|
|X3dOntologyQuery_01.rq||X3D Ontology X3dOntology4.0.ttl||X3dOntologyQuery_01.rq.txt||Metaquery (against X3D Ontology itself) to list all properties with corresponding domains and ranges.|
|X3dOntologyQuery_02.rq||X3D Ontology X3dOntology4.0.ttl||X3dOntologyQuery_02.rq.txt||Metaquery (against X3D Ontology itself) to list nodes and statements (concrete owl:Class) with inherited node types and object types.|
|X3dOntologyQuery_03.rq||X3D Ontology X3dOntology4.0.ttl||X3dOntologyQuery_03.rq.txt||Metaquery (against X3D Ontology itself) to list all geometry nodes.|
|X3dHelloWorldQuery_01.rq||HelloWorld.ttl||X3dHelloWorldQuery_01.rq.txt||Query HelloWorld.ttl to count number of Shape nodes, with expected result = 2 nodes.|
|X3dHelloWorldQuery_02.rq||HelloWorld.ttl||X3dHelloWorldQuery_02.rq.txt||Query HelloWorld.ttl to show url values within an ImageTexture node.|
|X3dHelloWorldQuery_03.rq||HelloWorld.ttl||X3dHelloWorldQuery_03.rq.txt||Query HelloWorld.ttl to show title given to model within a WorldInfo node.|
|X3dHelloWorldQuery_04.rq||HelloWorld.ttl||X3dHelloWorldQuery_04.rq.txt||Query HelloWorld.ttl to show contained geometry, appearance, material and texture field SFNode values within each Shape node.|
|X3dHelloWorldQuery_05.rq||HelloWorld.ttl||X3dHelloWorldQuery_05.rq.txt||Query HelloWorld.ttl to show all nodes in 'children' field contained within any Group node.|
|X3dSanCarlosCathedralAltarQuery_01.rq||Altar.ttl||X3dSanCarlosCathedralAltarQuery_01.rq.txt||Query SanCarlosCathedral Altar.ttl to show the number of shapes composing the altar.|
|X3dSanCarlosCathedralAltarQuery_02.rq||Altar.ttl||X3dSanCarlosCathedralAltarQuery_02.rq.txt||Query SanCarlosCathedral Altar.ttl to show url addresses of all textures used within the scene.|
|X3dSanCarlosCathedralAltarQuery_03.rq||Altar.ttl||X3dSanCarlosCathedralAltarQuery_03.rq.txt||Query SanCarlosCathedral Altar.ttl to determine Background skyColor values.|
Comprehensive conversion and test-query results for all models in
X3D Resources, Examples: Scene Archives for X3D
are listed in
This is a comprehensive set of unit tests for X3D ontology, xslt model conversion into
The OWL 2 Web Ontology Language, informally OWL 2, is an ontology language for the Semantic Web with formally defined meaning. OWL 2 ontologies provide classes, properties, individuals, and data values and are stored as Semantic Web documents. OWL 2 ontologies can be used along with information written in RDF, and OWL 2 ontologies themselves are primarily exchanged as RDF documents. This document serves as an introduction to OWL 2 and the various other OWL 2 documents. It describes the syntaxes for OWL 2, the different kinds of semantics, the available profiles (sub-languages), and the relationship between OWL 1 and OWL 2.
This document describes a precise semantics for the Resource Description Framework 1.1 [RDF11-CONCEPTS] and RDF Schema [RDF11-SCHEMA]. It defines a number of distinct entailment regimes and corresponding patterns of entailment. It is part of a suite of documents which comprise the full specification of RDF 1.1.
RDF is a directed, labeled graph data format for representing information in the Web. This specification defines the syntax and semantics of the SPARQL query language for RDF. SPARQL can be used to express queries across diverse data sources, whether the data is stored natively as RDF or viewed as RDF via middleware. SPARQL contains capabilities for querying required and optional graph patterns along with their conjunctions and disjunctions. SPARQL also supports aggregation, subqueries, negation, creating values by expressions, extensible value testing, and constraining queries by source RDF graph. The results of SPARQL queries can be result sets or RDF graphs.
The Resource Description Framework (RDF) is a general-purpose language for representing information in the Web. This document defines a textual syntax for RDF called Turtle that allows an RDF graph to be completely written in a compact and natural text form, with abbreviations for common usage patterns and datatypes. Turtle provides levels of compatibility with the N-Triples format as well as the triple pattern syntax of the SPARQL W3C Recommendation.
Many tools are available for Semantic Web development. Here are the primary ones used for this work.
JENA_HOME=C:\languages\java\apache-jena-3.13.1(or somesuch location) to run build tasks and ARQ queries properly.
Questions, suggestions, additions and comments about this X3D Ontology for Semantic Web page are welcome. Please send them to Don Brutzman and Jakub Flotyński (email brutzman at nps.edu and flotynski at kti.ue.poznan.pl).
Master version of this X3D Ontology for Semantic Web page is available online at
https://www.web3d.org/x3d/content/semantics/semantics.html and available in Sourceforge version control.
Updated: 23 March 2020