22520 2013-06-29 21:02:18 +0000 [HTML]: 2013-07-01 13:30:22 +0000 1 1 1 Unclassified HTML WG HTML5 spec unspecified PC All RESOLVED FIXED P2 normal --- 1 master.skywalker.88 dave.null mike public-html-admin public-html-wg-issue-tracking public-html-bugzilla oldest_to_newest 90028 0 master.skywalker.88 2013-06-29 21:02:18 +0000 "Link types" - Insert "schema.DCTERMS" and "schema.DC" among the allowed < rel> attribute values, according to the Dublin Core Metadata specification <http://dublincore.org/documents/dc-html/>, along with the DCTERMS.[element] and DC.[element] statements. This would allow a correct usage of the <meta name="dcterms.[element]" ...> meta tag. These meta names are proposed in the MetaExtension WikiWHATWG page, but according to the DCMI reference, such indications are useless because the name "dcterms.[element]" does not compose a reference URI considered stand-alone. It would provide an easy, complete and standard-compliant way of indicating useful metadata, included but not limited to, validity of a document and last modification. Otherwise, provide a standard implied reference for metadata defined with "dcterms" and "dc" prefix literals, which is explicitly excluded by the mentioned reference. 90031 1 mike 2013-06-30 03:02:35 +0000 (In reply to comment #0) > These meta names are proposed in the MetaExtension WikiWHATWG page, but > according to the DCMI reference, such indications are useless because the > name "dcterms.[element]" does not compose a reference URI considered > stand-alone. What does that mean? 90035 2 master.skywalker.88 2013-06-30 10:17:06 +0000 (In reply to comment #1) > What does that mean? Quotes from Dublin Core: "The DCAM uses Uniform Resource Identifiers (URIs) [RFC3986] to refer both to the resources described and to metadata terms (properties, classes, vocabulary encoding schemes and syntax encoding schemes). In the DC-HTML profile, those URIs are encoded as X/HTML attribute values." "In DC-HTML, property URIs and syntax encoding scheme URIs are represented as DC-HTML Prefixed Names. A DC-HTML Prefixed Name is an abbreviation for a URI used in the DC-HTML format. A DC-HTML Prefixed Name consists of a "prefix" followed by a period (".") and a "local name"." "The "prefix" in a DC-HTML Prefixed Name is associated with a "namespace URI" using a namespace declaration, made using a Namespace Declaration Element. The URI represented by the DC-HTML Prefixed Name is determined by concatenating the "namespace URI" with which the prefix is associated and the "local name"." "A DC-HTML namespace declaration associates a URI with a prefix, so that when that prefix is used in a DC-HTML Prefixed Name, that URI is used as a "namespace URI". A namespace declaration is made using the X/HTML link element and a specific convention for the value of the rel attribute. In the DC-HTML profile, an X/HTML link element of which the rel attribute has a value beginning with the characters schema. represents a namespace declaration. The DC-HTML namespace declaration must include: - a prefix, represented by part of the value of the rel attribute of the X/HTML link element following the characters schema. - a namespace URI, represented by the value of the href attribute of the X/HTML link element" "In the DC-HTML profile, a property URI in a statement containing a literal values surrogate is represented as a DC-HTML Prefixed Name which is the value of the name attribute of an X/HTML meta element." For a complete reference and examples, though dated, see "Expressing Dublin Core metadata using HTML/XHTML meta and link elements" <http://dublincore.org/documents/dc-html/> 90044 3 master.skywalker.88 2013-06-30 20:02:45 +0000 Addendum: in short, in order to use DCTERMS metadata (http://wiki.whatwg.org/wiki/MetaExtensions), the list of allowed <link rel=""> values must be updated including at least the conventional namespace abbreviation "schema.DCTERMS", possibly along with the "schema.DC". The metadata description set model for HTML should be corrected as follows: code: <link rel="schema.DCTERMS" href="http://purl.org/dc/terms/" /> <meta name="DCTERMS.[element]" value="[elementValue]" /> (http://dublincore.org/documents/dc-html/) If the prefix used in a DC-HTML Prefixed Name has not been associated with a URI in a namespace declaration, no URI can be generated for that DC-HTML Prefixed Name [...] (if) there are no namespace declarations for those prefixes ... no URI is generated for those values of the name attribute of the meta element. [...] the "DC" and "DCTERMS" prefixes are not subject to any special treatment; there are no "built-in" namespace declarations. 90046 4 mike 2013-07-01 01:32:03 +0000 (In reply to comment #3) > Addendum: in short, in order to use DCTERMS metadata > (http://wiki.whatwg.org/wiki/MetaExtensions), the list of allowed <link > rel=""> values must be updated including at least the conventional namespace > abbreviation "schema.DCTERMS", possibly along with the "schema.DC". See http://microformats.org/wiki/existing-rel-values#unspecified 90052 5 master.skywalker.88 2013-07-01 11:31:55 +0000 (In reply to comment #4) > (In reply to comment #3) > > Addendum: in short, in order to use DCTERMS metadata > > (http://wiki.whatwg.org/wiki/MetaExtensions), the list of allowed <link > > rel=""> values must be updated including at least the conventional namespace > > abbreviation "schema.DCTERMS", possibly along with the "schema.DC". > > See http://microformats.org/wiki/existing-rel-values#unspecified Read in detail. Following this answer I also read the linked public discussion on Microformats.org until the message http://microformats.org/discuss/mail/microformats-discuss/2008-January/011452.html. So what are the conclusions? 90053 6 mike 2013-07-01 13:30:22 +0000 (In reply to comment #5) > (In reply to comment #4) > > (In reply to comment #3) > > > Addendum: in short, in order to use DCTERMS metadata > > > (http://wiki.whatwg.org/wiki/MetaExtensions), the list of allowed <link > > > rel=""> values must be updated including at least the conventional namespace > > > abbreviation "schema.DCTERMS", possibly along with the "schema.DC". > > > > See http://microformats.org/wiki/existing-rel-values#unspecified > > Read in detail. Following this answer I also read the linked public > discussion on Microformats.org until the message > http://microformats.org/discuss/mail/microformats-discuss/2008-January/ > 011452.html. So what are the conclusions? I'm not sure what the conclusions are but I've gone ahead and added support for link@rel=schema.dc and link@rel=schema.dcterms anyway. Please test it and if you find anything wrong, feel free to reopen this bug or post a new one. http://validator.w3.org/nu/