RDFa
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RDFa is a way of embedding RDF in HTML that has maybe one or a few publishers on the indieweb, but no known consuming use-cases, perhaps due to being unnecessarily more verbose than Microformats as demonstrated by the example documented at kevinmarks.com/microformatschema.html.
RDFa adds several attributes to standard HTML: typeof
to specify an RDF resource type, vocab
to specify the schema containing the type, and (much more plentifully) property
to specify the field names described by markup nodes. Microformats use the already existing class
attribute for all these purposes, following common Semantic HTML practices.
Minimal markup example
This is a minimal article, with microformats, microformats2, and RDFa, in HTML5.
<main role="main" vocab="http://schema.org/" typeof="Blog WebPage"> <article class="h-entry hentry singular" property="blogPost" typeof="BlogPosting" lang="en"> <header> <h1 class="entry-title p-name" property="headline">article title</h1> <img class="u-featured" property="image" src="https://domain.com/article.jpg" /> </header> <div class="e-summary entry-summary" property="description"> <p>Short summary of the article.</p> </div> <div class="e-content entry-content" property="articleBody"> Long article body </div> <footer> <time class="dt-published dt-updated published updated" datetime="1970-01-01T00:00:00+00:00" property="dateModified datePublished">1970-01-01 00:00</time>, by <span class="p-author h-card vcard" property="author" typeof="Person"> <img class="photo avatar u-photo u-avatar" property="image" src="https://domain.com/author.jpg" alt="Photo of author" /> <a class="fn p-name url u-url u-uid org" property="url" href="https://domain.com/"> <span property="name">Author Name</span> </a> </span>, published by <span property="publisher" typeof="Organization"> <span property="logo" typeof="ImageObject"> <img src="https://domain.com/logo.jpg" alt="publisher image" property="url" /> </span> <span property="name">domain.com</span> <a href="https://domain.com" property="url">https://domain.com</a> </span> </footer> </article> </main>
See Also
- RDF
- Wikipedia:RDFa
- example of a BBC radio episode equivalently described in mf2 and jf2 as well as RDFa and JSON-LD
- microformats
- microformats2
- 2008-10-12 Evan Prodormou: RDFa vs microformats
- https://github.com/doriantaylor/rdfa-xslt
- Sarcastic criticism: https://twitter.com/pierrefar/status/1150809254741315584
- "I use RDFa in valid XHTML documents because I like torturing programmers and machines." @pierrefar July 15, 2019