Some RDF documents are very large and not intended for immediate consumption, but rather loading into an endpoint or complex analysis.<\/p>\n
However, others are intended for more-or-less stand alone use. Examples would include a FOAF profile<\/a> or the RDF event programme<\/a> that we’ve been working on. Having worked with a few of these as a developer, I suggest that it is good practice to include an rdf:type and a suitable label (dc:title, foaf:name, rdfs:label, skos:prefLabel) for them. This makes working with them much much easier.<\/p>\n For example if you include:<\/p>\n That’s all fine and good, but I can’t actually render that into, say, a caption without at least knowing…<\/p>\n Resolving secondary URIs from a document is expensive, if done on-the-fly. Any reduction is very helpful, so if I’m trying to, say, index-by-Person the photos described in your photo collection RDF then knowing…<\/p>\n …would also help a hacker out.<\/p>\n The new version of the Graphite RDF Browser<\/a> and SPARQL Browser<\/a> both show this information if it’s available, and it makes things much easier to work with, for example, the Data.gov.uk schools data is pretty good for give a label to everything and a type to most things<\/a>.<\/p>\n The SPARQL Browser attempts to get labels, using the following ugly but surprisingly fast query:<\/p>\n And then a similar one for rdf:type. These are both, of couse, subject to the max-results of the SPARQL endpoint. As in the past I was an SQL programmer, this limit bites me again and again.<\/p>\n","protected":false},"excerpt":{"rendered":" Some RDF documents are very large and not intended for immediate consumption, but rather loading into an endpoint or complex analysis. However, others are intended for more-or-less stand alone use. Examples would include a FOAF profile or the RDF event programme that we’ve been working on. Having worked with a few of these as a […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[198,281,136,411],"tags":[],"class_list":["post-408","post","type-post","status-publish","format-standard","hentry","category-best-practice","category-graphite","category-rdf","category-sparql"],"_links":{"self":[{"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/posts\/408","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/comments?post=408"}],"version-history":[{"count":9,"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/posts\/408\/revisions"}],"predecessor-version":[{"id":410,"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/posts\/408\/revisions\/410"}],"wp:attachment":[{"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/media?parent=408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/categories?post=408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.soton.ac.uk\/webteam\/wp-json\/wp\/v2\/tags?post=408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}example:myphoto foaf:depicts <http:\/\/dbpedia.org\/resource\/Andrew_Eldritch> .<\/pre>\n
<http:\/\/dbpedia.org\/resource\/Andrew_Eldritch> foaf:name \"Andrew Eldritch\" .<\/pre>\n
<http:\/\/dbpedia.org\/resource\/Andrew_Eldritch> rdf:type foaf:Person .<\/pre>\n
SELECT DISTINCT ?s ?p ?o WHERE {\r\n{ <http:\/\/id.ecs.soton.ac.uk\/person\/1248> ?x ?s . ?s ?p ?o . ?s <http:\/\/www.w3.org\/2000\/01\/rdf-schema#label> ?o .\u00a0 }\u00a0 UNION\r\n{ <http:\/\/id.ecs.soton.ac.uk\/person\/1248> ?x ?s . ?s ?p ?o . ?s <http:\/\/purl.org\/dc\/terms\/title> ?o .\u00a0 }\u00a0 UNION\r\n{ <http:\/\/id.ecs.soton.ac.uk\/person\/1248> ?x ?s . ?s ?p ?o . ?s <http:\/\/purl.org\/dc\/elements\/1.1\/title> ?o .\u00a0 }\u00a0 UNION\r\n{ <http:\/\/id.ecs.soton.ac.uk\/person\/1248> ?x ?s . ?s ?p ?o . ?s <http:\/\/xmlns.com\/foaf\/0.1\/name> ?o .\u00a0 }\u00a0 UNION\r\n{ ?s ?x <http:\/\/id.ecs.soton.ac.uk\/person\/1248> . ?s ?p ?o . ?s <http:\/\/www.w3.org\/2000\/01\/rdf-schema#label> ?o .\u00a0 }\u00a0 UNION\r\n{ ?s ?x <http:\/\/id.ecs.soton.ac.uk\/person\/1248> . ?s ?p ?o . ?s <http:\/\/purl.org\/dc\/terms\/title> ?o .\u00a0 }\u00a0 UNION\r\n{ ?s ?x <http:\/\/id.ecs.soton.ac.uk\/person\/1248> . ?s ?p ?o . ?s <http:\/\/purl.org\/dc\/elements\/1.1\/title> ?o .\u00a0 }\u00a0 UNION\r\n{ ?s ?x <http:\/\/id.ecs.soton.ac.uk\/person\/1248> . ?s ?p ?o . ?s <http:\/\/xmlns.com\/foaf\/0.1\/name> ?o .\u00a0 }\u00a0 UNION\r\n}<\/pre>\n