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Topic: RDF schema

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	RDF Vocabulary Description Language 1.0: RDF Schema
		RDF Schema defines classes and properties that may be used to describe classes, properties and other resources.
		RDF's vocabulary description language, RDF Schema, is a semantic extension (as defined in [RDF-SEMANTICS]) of RDF.
		RDF differs from many such systems in that instead of defining a class in terms of the properties its instances may have, the RDF vocabulary description language describes properties in terms of the classes of resource to which they apply.
	www.w3.org /TR/rdf-schema (3714 words)

	Guidance on expressing the Dublin Core within the Resource Description Framework (RDF)
		RDF is an attempt to empower effective creation, exchange and use of metadata on the World Wide Web, and therefore addresses many of the same issues as the Dublin Core.
		However, the basic RDF syntax utilised in the examples throughout this paper is not suitable for embedding in HTML documents, due to the inconsistent manner in which it is treated by the current generation of web browsing software, and a special abbreviated syntax [RDF-ABBREV] must be used instead.
		The RDF instance of this declaration can be found in Appendix 2, although users and developers should always refer to the Namespace itself for the most definitive version.
	www.ukoln.ac.uk /metadata/resources/dc/datamodel/WD-dc-rdf (8138 words)

	Resource Description Framework (RDF) Schema Specification
		The RDF schema specification language is less expressive, but much simpler to implement, than full predicate calculus languages such as CycL[CycL] and KIF [KIF].
		RDF and the RDF Schema language were also based on metadata research in the the Digital Library community.
		RDF represents an evolution of the Warwick Framework model in that the Warwick Framework allowed each metadata vocabulary to be represented in a different syntax.
	xml.coverpages.org /rdfSchema980814.html (5684 words)

	Resource Description Framework (RDF) Schema Specification 1.0 (Site not responding. Last check: 2007-11-03)
		An RDF Schema is expressed by the data model described in the RDF Model and Syntax [RDFMS] specification.
		For example, an RDF schema might describe limitations on the types of values that are valid for some property, or on the classes to which it makes sense to ascribe such properties.
		RDF uses the XML Namespace facility [XMLNS] to identify the schema in which the properties and classes are defined.
	www.w3.org /TR/2000/CR-rdf-schema-20000327 (6151 words)

	RDF Schema - Wikipedia, the free encyclopedia
		RDFS or RDF Schema is an extensible knowledge representation language, providing basic elements for the definition of ontologies, otherwise called RDF vocabularies, intended to structure RDF resources.
		The first version was proposed in March 1999, and the final W3C recommendation was released in February 2004.
		Main RDFS components are included in the more expressive language OWL.
	en.wikipedia.org /wiki/RDF_Schema (273 words)

	Adding formal semantics to the Web (Site not responding. Last check: 2007-11-03)
		In this paper, we will show how RDF Schema can be extended in such a way that a full knowledge representation language can be expressed in it, thus enriching it with the required additional expressivity and the semantics of this language.
		Note that RDFS uses a non-standard object-meta model: the properties rdfs:subClassOf, rdf:type, rdfs:domain and rdfs:range are used both as primitive constructs in the definition of the RDF schema specification and as specific instances of RDF properties.
		RDFS enriches this basic model by providing a vocabulary for RDF, which is assumed to have a certain semantics.
	www.ontoknowledge.org /oil/papers/extending-rdfs.html (5175 words)

	SchemaWeb - RDF Schemas Directory
		It provides a comprehensive directory of RDF schemas to be browsed and searched by human agents and also an extensive set of web services to be used by software agents that wish to obtain real-time schema information whilst processing RDF data.
		Browse the schemas held in the SchemaWeb directory and inspect the details of individual schemas including classes and properties, the raw RDF/XML and the RDF triples.
		This only shows its age in that all the alluded to RDF core specs (along with the mighty OWL) are now done and dusted and ready to rock.
	www.schemaweb.info (1242 words)

	Rough Notes on RDF (Site not responding. Last check: 2007-11-03)
		RDF syntax is a way of writing down (subject, prop, value) triples.
		The software for processing RDF in Python, C, Perl, etc. seems to be reasonably good, so it's not the fault of tool implementors; the tools exist, but no one has thought of what to do with them.
		Versa is an RDF query language invented by Uche Ogbuji and Mike Olson.
	www.amk.ca /xml/rdf-notes.html (951 words)

	Dave Beckett's Resource Description Framework (RDF) Resource Guide
		An Axiomatic Semantics for RDF, RDF Schema, and DAML+OIL by Richard Fikes and Deborah L. McGuinness.
		RDF, XML and the OAI Protocol: Avoiding Mixing Apples and Oranges, Carl Lagoze and John Perkins, 3 June 2001.
		RDF Standard Terms - attempt to re-state and define schemas of RDF and RDF Schema in a combined form, Dan Connolly, 13 August 2000.
	planetrdf.com /guide (10446 words)

	RDF/OWL Schema generator?
		Although there's definitely a place for up-front schema design, while coding it's often convenient to leave such stuff open, subject to change as the code informs.
		RDF instance data still makes a lot of (semantic) sense without having a schema/ontology, so this can be deferred indefinitely...
		But I think there's enough info in his instance examples to automatically build the skeleton of a schema - which is all I need in the near future (to use with Jena's schemagen, that autogenerates Java source corresponding to classes and properties).
	dannyayers.com /2006/06/02/rdfowl-schema-generator (350 words)

	oreilly.com -- Online Catalog: Practical RDF
		The Resource Description Framework (RDF) is a structure for describing and interchanging metadata on the Web--anything from library catalogs and worldwide directories to bioinformatics, Mozilla internal data structures, and knowledge bases for artificial intelligence projects.
		RDF's capabilities, however, have long been shrouded by its reputation for complexity and a difficult family of specifications.
		I had seen RDF used in RSS 1.0, but it was the more recent used of RDF by the creative commons for their licensing metadata that got me curious enough to want to learn more.
	www.oreilly.com /catalog/pracrdf (973 words)

	RDF and the Semantic Web LG #105
		RDF is a framework for defining metadata; data that describes data.
		RDF schema, though it's worth noting that although XML is the most common container format for RDF, other formats are in use.
		Each RDF statement is called a "triple", meaning it consists of three parts: subject, predicate, and object; the subject is either an RDF URI, or a blank node (I haven't seen a good explanation why these nodes are "blank", so I'll just refer to them as nodes).
	linuxgazette.net /105/oregan.html (2148 words)

	GraphSL: A Proposal for an RDF Graph Schema Language
		Whilst RDF Schema and OWL enable one to constrain the use of properties and classes in RDF, it would also be useful to be able to place constraints on the types of triples in RDF graphs.
		RDF applications from FOAF to RSS 1.0 to EARL have at times in their developments made people ask if these languages have a particular structure to their documents.
		There was no schema language around at the time that could express that, and there still isn't, so this proposal aims to fill that gap.
	infomesh.net /2003/graphsl (1257 words)

	The Cover Pages: XML Schema for RDF
		For this kind of schema, it seems that there is an order to it: * first define the complex types, * then declare any abstract element which use the type * then declare the elements that use the complex types or which have an equivClass.
		These are what XML Schemas calls abstract elements, I think.) In the documentation is a reference to a DTD I made for RDF too.
		I would say that the XML Schema is much more useful than the DTD: I think everything that was in a comment in the DTD version can be put into a declaration in the XML Schema.
	www.oasis-open.org /cover/xmlSchemaForRDF.html (309 words)

	Redland Notes - RDF and RDF Schema Concepts Reference
		This document was created to aid me in writing the RDF parser for Redland.
		This was required so that I could guarantee I was providing complete coverage of all legal RDF syntax and doing so correctly in all cases.
		Use of the MandS basic abbreviation syntax form 1 allowing "properties that are not repeated within a Description and where the values of those properties are literals" to be used as attributes of the Description element.
	librdf.org /notes/concepts.html (614 words)

	RDF Schema
		RDF Schema (RDFS) is an extension to RDF.
		RDF Schema does not provide actual application-specific classes and properties.
		Classes in RDF Schema is much like classes in object oriented programming languages.
	www.w3schools.com /rdf/rdf_schema.asp (505 words)

	Wikitravel:RDF Expedition - Wikitravel
		The RDF Expedition is an expedition to develop new ways to use RDF in Wikitravel.
		RDF is very expressive, but it depends on people making similar statements in the same way.
		Elements from the schema would be accessible with the namespace "wts:" (Wikitravel schema) in Turtle.
	wikitravel.org /en/Wikitravel:RDF_Expedition (831 words)

	RDF Tutorial
		RDF is a framework for describing Web resources, such as the title, author, modification date, content, and copyright information of a Web page.
		RDF containers are used to describe group of things.
		RDF collections are used to describe groups that contains ONLY the specified members.
	www.w3schools.com /rdf/default.asp (351 words)

	RDF Schema editor (Site not responding. Last check: 2007-11-03)
		The RDF Schema editor is an experimental prototype, written in
		The Schema editor is a program using a couple of general RDF modules.
		The Schema and Simple layers are programmed to not know anything about the storage of the RDF data.
	jonas.liljegren.org /perl/proj/rdf/schema_editor (208 words)

	web.resource.org/cc
		The CC schema lets you describe copyright licenses in RDF.
		For the specific implementation of each characteristic, as well as other details which may not be encoded in the RDF, you must consult the text of the actual license.
		RDF users might be interested in our machine-readable RDF Schema.
	web.resource.org /cc (287 words)

	XML Schema, RDF Schema & DAML Comparison
		It compares XML (eXtensible Markup Language), RDF (Resource Description Framework), and DAML (DARPA Agent Markup Language) by showing a description and examples of how each language addresses common knowledge representation requirements.
		In DAML, we have to Import ontologies to be able to use the classes defined in the ontology.
		The core RDF Schema only includes 'Literals' which is the set of all strings.
	www.isi.edu /expect/web/semanticweb/comparison.html (759 words)

	BIO: A vocabulary for biographical information
		It has been designed to be compatible with both RDF and non-RDF XML formats such as FOAF, RSS 1.0 and RSS 2.0.
		There are a couple of ways to use the BIO vocabulary with RSS 1.0.
		The BIO vocabulary can be used with RSS 2.0 if care is taken to avoid any specific RDF extensions.
	vocab.org /bio/0.1 (829 words)

	Reviews on the Web: RDF Schema (Site not responding. Last check: 2007-11-03)
		Nothing in this schema restricts it to book reviews; you could review CDs, Web sites, or even other reviews, as long as a unique URI can be assigned to each resource being reviewed.
		Obviously, at least one item must be specified for each review, though reviews can also be concerned with more than one item, as in a review of a trilogy of books, or several books on the same topic.
		My largest reason to go back to RDF is that I would then have to write hReview processing code to do anything with my reviews, which is much more difficult and less extensible than just running everything through an already-written RDF parser.
	www.amk.ca /xml/reviews.html (901 words)

	[No title]
		The Description of a Project (DOAP) vocabulary, described using W3C RDF Schema and the Web Ontology Language.
		Le vocabulaire Description Of A Project (DOAP, Description D'Un Projet), dÃ©crit en utilisant RDF Schema du W3C et OWL.
		The URI of an RDF description of the license the software is distributed under.
	usefulinc.com /ns/doap (575 words)

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