Sigmoid Social

multimericScrolling past the Royal Flying Doctor Service website for the 100th time as I Google for the RDF Schema documentation<a href="https://genomic.social/tags/semanticweb" class="mention hashtag" rel="nofollow noopener" target="_blank">#semanticweb</a> <a href="https://genomic.social/tags/rdf" class="mention hashtag" rel="nofollow noopener" target="_blank">#rdf</a> <a href="https://genomic.social/tags/rdfs" class="mention hashtag" rel="nofollow noopener" target="_blank">#rdfs</a> <a href="https://genomic.social/tags/owl" class="mention hashtag" rel="nofollow noopener" target="_blank">#owl</a>

Jeen<a href="https://genomic.social/@multimeric" class="u-url mention" rel="nofollow noopener" target="_blank">@multimeric</a> I think they serve different purposes. <a href="https://mastodon.nz/tags/rdfs" class="mention hashtag" rel="nofollow noopener" target="_blank">#rdfs</a> is not really a schema language, at least not in the "here is a prescribed structure you can validate against" sense. It was more intended as a descriptional thing, something to define basic vocabulary ("my model is about kinds of vehicles, like cars, and bikes"). A lightweight ontology language if you will. SHACL is about setting structure constraints, and data validation. They're complementary IMO.

multimericRDF people: why does everyone still use RDFS and not SHACL for writing schemas, when all the actual validation tools are for SHACL?Are there even any RDFS validators? I can't find any.<a href="https://genomic.social/tags/rdf" class="mention hashtag" rel="nofollow noopener" target="_blank">#rdf</a> <a href="https://genomic.social/tags/semanticweb" class="mention hashtag" rel="nofollow noopener" target="_blank">#semanticweb</a> <a href="https://genomic.social/tags/rdfs" class="mention hashtag" rel="nofollow noopener" target="_blank">#rdfs</a> <a href="https://genomic.social/tags/shacl" class="mention hashtag" rel="nofollow noopener" target="_blank">#shacl</a>

Fabien Gandon📢 Le Programme IA chez Inria recrute dans le Projet P16 un Ingénieur développeur Senior Java pour la bibliothèque Corese (linked data, knowledge graphs, web sémantique)👥 Candidatez ici : <a href="http://jobs.inria.fr/public/classic/fr/offres/2025-08596" rel="nofollow noopener" translate="no" target="_blank">http://jobs.inria.fr/public/classic/fr/offres/2025-08596</a> 🔑 <a href="https://mas.to/tags/RDF" class="mention hashtag" rel="nofollow noopener" target="_blank">#RDF</a> <a href="https://mas.to/tags/RDFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#RDFS</a> <a href="https://mas.to/tags/OWL" class="mention hashtag" rel="nofollow noopener" target="_blank">#OWL</a> <a href="https://mas.to/tags/SHACL" class="mention hashtag" rel="nofollow noopener" target="_blank">#SHACL</a> <a href="https://mas.to/tags/SPARQL" class="mention hashtag" rel="nofollow noopener" target="_blank">#SPARQL</a> <a href="https://mas.to/tags/LinkedData" class="mention hashtag" rel="nofollow noopener" target="_blank">#LinkedData</a> <a href="https://mas.to/tags/WebSem" class="mention hashtag" rel="nofollow noopener" target="_blank">#WebSem</a> <a href="https://mas.to/tags/KnowledgeGraphs" class="mention hashtag" rel="nofollow noopener" target="_blank">#KnowledgeGraphs</a><a href="https://mas.to/tags/Jobs" class="mention hashtag" rel="nofollow noopener" target="_blank">#Jobs</a>.inria.fr <a href="https://mas.to/tags/Emploi" class="mention hashtag" rel="nofollow noopener" target="_blank">#Emploi</a> <a href="https://mas.to/tags/SophiaAntipolis" class="mention hashtag" rel="nofollow noopener" target="_blank">#SophiaAntipolis</a> <a href="https://mas.to/tags/Job" class="mention hashtag" rel="nofollow noopener" target="_blank">#Job</a>

Harald SackVersion 1.0 of the JavaScript <a href="https://sigmoid.social/tags/shacl" class="mention hashtag" rel="tag">#shacl</a> library shacl-engine is out. here are no breaking changes, only new features, but to indicate that this package is production ready, the version was lifted from 0.x to 1.x. via ThomasBergwinkl@LinkedIn <a href="https://mastodon.social/@bergi" class="u-url mention">@bergi</a> <a href="https://github.com/rdf-ext/shacl-engine" target="_blank" rel="nofollow noopener" translate="no">https://github.com/rdf-ext/shacl-engine</a><a href="https://sigmoid.social/tags/shack" class="mention hashtag" rel="tag">#shack</a> <a href="https://sigmoid.social/tags/semanticweb" class="mention hashtag" rel="tag">#semanticweb</a> <a href="https://sigmoid.social/tags/sparql" class="mention hashtag" rel="tag">#sparql</a> <a href="https://sigmoid.social/tags/rdf" class="mention hashtag" rel="tag">#rdf</a> <a href="https://sigmoid.social/tags/rdfs" class="mention hashtag" rel="tag">#rdfs</a> <a href="https://sigmoid.social/tags/javascript" class="mention hashtag" rel="tag">#javascript</a>

Harald SackIn the <a href="https://sigmoid.social/tags/ISE2024" class="mention hashtag" rel="tag">#ISE2024</a> lecture today, we will discuss RDF as basic building block for the Web of Data.slides: <a href="https://drive.google.com/file/d/1gJ3RD3Sz2JuEpCF-mBBfA85boYP_jrON/view?usp=drive_link" target="_blank" rel="nofollow noopener" translate="no">https://drive.google.com/file/d/1gJ3RD3Sz2JuEpCF-mBBfA85boYP_jrON/view?usp=drive_link</a><a href="https://sigmoid.social/tags/semanticweb" class="mention hashtag" rel="tag">#semanticweb</a> <a href="https://sigmoid.social/tags/knowledgegraphs" class="mention hashtag" rel="tag">#knowledgegraphs</a> <a href="https://sigmoid.social/tags/rdf" class="mention hashtag" rel="tag">#rdf</a> <a href="https://sigmoid.social/tags/rdfs" class="mention hashtag" rel="tag">#rdfs</a> <a href="https://sigmoid.social/tags/WebOfData" class="mention hashtag" rel="tag">#WebOfData</a> <a href="https://sigmoid.social/@fizise" class="u-url mention">@fizise</a> <a href="https://sigmoid.social/@MahsaVafaie" class="u-url mention">@MahsaVafaie</a> <a href="https://sigmoid.social/@enorouzi" class="u-url mention">@enorouzi</a> <a href="https://sigmoid.social/@shufan" class="u-url mention">@shufan</a> <a href="https://fedihum.org/@sourisnumerique" class="u-url mention">@sourisnumerique</a>

iswsFirst tutorial at <a href="https://sigmoid.social/tags/ISWS2024" class="mention hashtag" rel="tag">#ISWS2024</a> is presented by Sebastian Rudolph from TU Dresden. Sebastian is talking about "Reasoning over Knowledge Graphs" and starts his tutorial with knowledge representation basics such as <a href="https://sigmoid.social/tags/rdf" class="mention hashtag" rel="tag">#rdf</a> <a href="https://sigmoid.social/tags/rdfs" class="mention hashtag" rel="tag">#rdfs</a> <a href="https://sigmoid.social/tags/sparql" class="mention hashtag" rel="tag">#sparql</a> etc.<a href="https://sigmoid.social/tags/semanticweb" class="mention hashtag" rel="tag">#semanticweb</a> <a href="https://sigmoid.social/tags/knowledgegraphs" class="mention hashtag" rel="tag">#knowledgegraphs</a> <a href="https://sigmoid.social/tags/reasoning" class="mention hashtag" rel="tag">#reasoning</a> <a href="https://sigmoid.social/tags/knowledgerepresentation" class="mention hashtag" rel="tag">#knowledgerepresentation</a> <a href="https://sigmoid.social/tags/summerschool" class="mention hashtag" rel="tag">#summerschool</a>

Pierre MaillotUsing IndeGx and our endpoint catalog, I surveyed the usage of <a href="https://mastodon.social/tags/RDF" class="mention hashtag" rel="nofollow noopener" target="_blank">#RDF</a>, <a href="https://mastodon.social/tags/RDFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#RDFS</a>, <a href="https://mastodon.social/tags/OWL" class="mention hashtag" rel="nofollow noopener" target="_blank">#OWL</a>, <a href="https://mastodon.social/tags/SWRL" class="mention hashtag" rel="nofollow noopener" target="_blank">#SWRL</a>, <a href="https://mastodon.social/tags/SHACL" class="mention hashtag" rel="nofollow noopener" target="_blank">#SHACL</a>, <a href="https://mastodon.social/tags/SPIN" class="mention hashtag" rel="nofollow noopener" target="_blank">#SPIN</a>, and <a href="https://mastodon.social/tags/SKOS" class="mention hashtag" rel="nofollow noopener" target="_blank">#SKOS</a> over 320 endpoints. Some insights: - Only 2 endpoints do not use RDF, one seems to have gone down during tests, and the other uses only Schema - 11 endpoints use exclusively RDF - Endpoints use an average of 3.8 of the listed vocabularies - By far, the most used are RDF, RDFS, OWL and SKOS - All vocabularies are used together at least once More details to follow <a href="https://mastodon.social/tags/linkeddata" class="mention hashtag" rel="nofollow noopener" target="_blank">#linkeddata</a> <a href="https://mastodon.social/tags/sparql" class="mention hashtag" rel="nofollow noopener" target="_blank">#sparql</a>

jonny (good kind)<a href="https://hachyderm.io/@hrefna" class="u-url mention" rel="nofollow noopener" target="_blank">@hrefna</a> you're so deeply right in this thread. this essentially defines the early and formative years of <a href="https://neuromatch.social/tags/RDF" class="mention hashtag" rel="nofollow noopener" target="_blank">#RDF</a> and <a href="https://neuromatch.social/tags/RDFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#RDFS</a> around some key decisions. There is so much worry about errors from mishandling, but the very possibility of expressing something that could be wrong. There is so much here it's hard to even know where to start but from the very start of the rdf-core and especially rdf-logic mailing lists the emphasis on correctness of expression vs. agency of interpretation is heated. This is a pretty unsubtle example: <a href="https://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2001Nov/0423.html" rel="nofollow noopener" translate="no" target="_blank">https://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2001Nov/0423.html</a><blockquote>"Summary: RDF is not just a data model. The RDF specs should define a semantics so that an RDF statement on the web is interpreted as an assertion of that statement such that its author would be responsible in law as if it had been published in, say, a newspaper."</blockquote>affirmed by this text: <a href="https://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2002Jun/0180.html" rel="nofollow noopener" translate="no" target="_blank">https://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2002Jun/0180.html</a><blockquote>"The RDFCore WG takes the view that RDF/XML documents, ie. encodings of RDF graphs, are represenations of claims or assertions about the world. [...] we note that RDF graphs are the kind of things that can be true or false (rather than 'mere bytes'). For each linear syntax of RDF, there will be conventions (social, legal) for indicating which chunks of data are encodings of RDF graphs in that syntax, and thus of propositional content."</blockquote>So ya very very early they had decided that RDF was intended to be platonic representation of the world - it is a method of making propositions that must directly bear on the world, there is no ambiguity, there are only true or false things. (There's a lot of subtlety in that but yno.)Another thing that comes to mind is the discussion of monotonicity that happens throughout, that's also tied up with the discussion of closed worldedness, containers, and whether or not things belong in sets for the purpose of local meaning or need to belong to the One Great Uniform Graph. It must be impossible for adding new triples into the reasoner to make it less certain of some outcome (ie. if it was possible for ambiguity to be introduced eg. by tangled type hierarchies etc.). This thread is all very illustrative but this message is super spicy and also touches on what you're talking about re using the level of granularity you care about: <a href="https://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2001Nov/0363.html" rel="nofollow noopener" translate="no" target="_blank">https://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2001Nov/0363.html</a><a href="https://lists.w3.org/Archives/Public/w3c-rdfcore-wg/2001Nov/0381.html" rel="nofollow noopener" target="_blank">this quote</a> from D bricks is also pretty telling of the epistemological commitments: "RDF Schema is not about policing the content of specific descriptions 'what is said'; it's about policing what is sensibly sayable."

Harald SackIn the next section in this week's <a href="https://sigmoid.social/tags/kg2023" class="mention hashtag" rel="tag">#kg2023</a> online lecture you will learn about vocabularies and how to design simple models with the RDF Schema Description Language RDFS. video lecture: <a href="https://open.hpi.de/courses/knowledgegraphs2023/items/2fLyYCsLoiikZJCuCjjspY" target="_blank" rel="nofollow noopener" translate="no">https://open.hpi.de/courses/knowledgegraphs2023/items/2fLyYCsLoiikZJCuCjjspY</a> <a href="https://sigmoid.social/tags/OpenHPI" class="mention hashtag" rel="tag">#OpenHPI</a> <a href="https://wisskomm.social/@fiz_karlsruhe" class="u-url mention">@fiz_karlsruhe</a> <a href="https://sigmoid.social/@fizise" class="u-url mention">@fizise</a> <a href="https://fedihum.org/@tabea" class="u-url mention">@tabea</a> <a href="https://fedihum.org/@sashabruns" class="u-url mention">@sashabruns</a> <a href="https://sigmoid.social/@enorouzi" class="u-url mention">@enorouzi</a> <a href="https://sigmoid.social/tags/knowledgegraphs" class="mention hashtag" rel="tag">#knowledgegraphs</a> <a href="https://sigmoid.social/tags/mooc" class="mention hashtag" rel="tag">#mooc</a> <a href="https://sigmoid.social/tags/lecture" class="mention hashtag" rel="tag">#lecture</a> <a href="https://sigmoid.social/tags/semanticweb" class="mention hashtag" rel="tag">#semanticweb</a> <a href="https://sigmoid.social/tags/rdf" class="mention hashtag" rel="tag">#rdf</a> <a href="https://sigmoid.social/tags/rdfs" class="mention hashtag" rel="tag">#rdfs</a> <a href="https://sigmoid.social/tags/startrek" class="mention hashtag" rel="tag">#startrek</a>

Harald SackAnnouncing Aidan Hogan and Sebastian Rudolph for the first tutorial session on querying and reasoning on <a href="https://sigmoid.social/tags/knowledgegraphs" class="mention hashtag" rel="tag">#knowledgegraphs</a> at <a href="https://sigmoid.social/tags/isws2023" class="mention hashtag" rel="tag">#isws2023</a> <a href="https://sigmoid.social/tags/SPARQL" class="mention hashtag" rel="tag">#SPARQL</a> <a href="https://sigmoid.social/tags/RDF" class="mention hashtag" rel="tag">#RDF</a> <a href="https://sigmoid.social/tags/RDFS" class="mention hashtag" rel="tag">#RDFS</a> <a href="https://sigmoid.social/tags/SemanticWeb" class="mention hashtag" rel="tag">#SemanticWeb</a> <a href="https://sigmoid.social/tags/GraphDatabases" class="mention hashtag" rel="tag">#GraphDatabases</a>

Kingsley Uyi IdehenQ: What is a Language? A: Read: <a href="https://bsky.brid.gy/hashtag/RDF" rel="nofollow noopener" target="_blank">#RDF</a> <a href="https://bsky.brid.gy/hashtag/SPARQL" rel="nofollow noopener" target="_blank">#SPARQL</a> <a href="https://bsky.brid.gy/hashtag/SQL" rel="nofollow noopener" target="_blank">#SQL</a> <a href="https://bsky.brid.gy/hashtag/OWL" rel="nofollow noopener" target="_blank">#OWL</a> <a href="https://bsky.brid.gy/hashtag/RDFS" rel="nofollow noopener" target="_blank">#RDFS</a> <a href="https://bsky.brid.gy/hashtag/SemanticWeb" rel="nofollow noopener" target="_blank">#SemanticWeb</a> <a href="https://bsky.brid.gy/hashtag/LinkedData" rel="nofollow noopener" target="_blank">#LinkedData</a> <a href="https://bsky.brid.gy/hashtag/SmartData" rel="nofollow noopener" target="_blank">#SmartData</a> <a href="https://bsky.brid.gy/hashtag/OpenData" rel="nofollow noopener" target="_blank">#OpenData</a> <a href="https://bsky.brid.gy/hashtag/BigData" rel="nofollow noopener" target="_blank">#BigData</a>

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