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RDFa Phentermine For Sale, HTML4 provides limited ways to give meaning to content through markup alone. Online buying Phentermine hcl, In this post, we examine Microformats that provide real-world design principles, canada, mexico, india, Discount Phentermine, RDFa which enables extensible vocabularies and the new Microdata features of HTML5. All three seek to combine machine-readable data with human-readable content, Phentermine canada, mexico, india. Order Phentermine from United States pharmacy, This past weekend, the White House switched their web site to Drupal, Phentermine from mexico. Phentermine interactions, In addition to making news because it is using an open source stack (Linux, Apache, order Phentermine from mexican pharmacy, After Phentermine, MySQL, PHP and Apache Solr for search) it is noteworthy because it makes use of the XHTML+RDFa doctype, herbal Phentermine. This little-known spec is a W3C Recommendation (a "standard") that enables authors to add semantic metadata - RDF, which is usually contained in a separate document - to their markup using attributes that are both machine-readable and human-friendly, Phentermine For Sale. Phentermine results,

You Mean Like Microformats?

Microformats work as design patterns within the confines of HTML4 - using features such as the class attribute - but they rely on a pre-existing agreement between you (the author) and the author of the parser that consumes the markup. This agreement is in the form of a vocabulary for a particular type of information such as hCard for contact information: this is the name, Phentermine street price, Phentermine trusted pharmacy reviews, this is the phone number and so on. But what if you want to include a piece of information that isn't part of the microformat, Phentermine gel, ointment, cream, pill, spray, continuous-release, extended-release, Phentermine blogs, like a TTY number. You're stuck, buy no prescription Phentermine online. Phentermine For Sale, Unfortunately, that wasn't part of the original vCard spec (upon which hCard was based) and while there is a "flexible method" to add custom types to vCard, you're at the mercy of each parser whether it will detect your TTY number because you're restricted to the vocabulary that has been determined by the hCard microformat. Phentermine alternatives, However, microformats are easy to use and provide a compact syntax if you're publishing information that is covered by one of the many vocabularies provided, Phentermine schedule. Phentermine price, coupon, (Check out the great Getting Semantic With Microformats series by Emily Lewis to learn more about microformats.)

So What Is RDFa?

"One motivation for RDFa has been to devise a means by which documents can be augmented with metadata in a general rather than hard-wired manner. This has been achieved by creating a fixed set of attributes and parsing rules, Phentermine cost, Order Phentermine online c.o.d, but allowing those attributes to contain properties from any of a number of the growing range of available RDF vocabularies."

RDFa (Resource Description Framework in Attributes), like microformats, Phentermine overnight, Where can i cheapest Phentermine online, enables you to add structured meaning to your markup. Unlike microformats, Phentermine used for, Fast shipping Phentermine, RDFa allows you to specify the vocabulary used to describe the data. The quotation above comes from the XHTML+RDFa Recommendation RDFa in XHTML: Syntax and Processing, which is a very technical document, so start with the RDFa Primer, Phentermine For Sale. It provides clear examples of how you can "express simple and more complex datasets using RDFa, buy cheap Phentermine no rx, Effects of Phentermine, and in particular how to turn the existing human-visible text and links into machine-readable data without repeating content." Emphasis mine, for this is the key, online buy Phentermine without a prescription. Buy Phentermine online no prescription, With the push for government to publish more data, why should the data have to live in separate formats for human and machine audiences? There is certainly a lot of information that is published in HTML (and XHTML served as HTML) that could benefit from structured markup to open it up to the web of Linked Data, where can i buy cheapest Phentermine online. Phentermine without prescription, In September, the W3C eGovernment Interest
examined these benefits in the Working Draft document Publishing Open Government Data, Phentermine pics. Buy Phentermine online cod, In an interesting twist, the White House site previously used RDFa on their Copyright Policy page to markup Creative Commons license information, no prescription Phentermine online, Phentermine coupon, but now those attributes are no longer present, even though the page is using the XHTML+RDFa doctype. If you look at the root HTML Phentermine For Sale, element, you can see the following vocabularies being referenced using the "xmlns:" prefix (though unused): Dublin Core ( and Common Tag RDF Vocabulary ( Multiple vocabularies can be used on a given RDFa-enabled page and it is recommended to use a pre-existing vocabulary before you define your own.

What About HTML5?

Good question. As I mentioned before, XHTML+RDFa is a W3C Recommendation and RDFa is implemented in Drupal - a major CMS - and supported by both Google and Yahoo! to enhance search results. Just a few weeks ago, the HTML Working Group published a Working Draft of HTML+RDFa but there are still some big issues to sort out, due to the way XHTML+RDFa made use of the extensible nature of XHTML (remember the X?), particularly its use of XML namespaces and custom attributes; the goal is to add these attributes to HTML5. The Working Draft makes clear that it applies not only "to HTML5 documents in non-XML and XML mode [a.k.a, Phentermine For Sale. XHTML5], but also to HTML4 documents interpreted through the HTML5 parsing rules."

But HTML5 Has Microdata

Currently, the HTML5 Working Draft contains a section called Microdata, which resembles microformats but uses newly-created attributes to embed "machine-readable labels" and "nested groups of name-value pairs" called "items." HTML5 also defines a DOM API to extract an item's properties. The current spec, which was published today, states that "using microdata means using a vocabulary" and even goes so far as to encourage authors to "to re-use existing vocabularies, as this makes content re-use easier" which sounds similar to RDFa. Yet the WHATWG chose not to re-use the syntax and grammar of RDFa. Jeni Tennison dove into the differences between the two in HTML5/RDFa Arguments and a commenter claiming to be Tantek Çelik (co-creator of Microformats) noted that Ian Hickson chose to model microdata on microformats instead.

The debate between microdata and RDFa continues now, even as Ian Hickson announced today that HTML5 is at Last Call, Last Call status only applies to the path of HTML5 within the WHATWG, not its path through the W3C HTML Working Group. Issue 76 in the HTML WG Tracker is still open regarding "Concerns about Microdata section and inclusion/exclusion of RDFa."

Although the issue of microdata and/or RDFa continues, it is clear that HTML5 will provide a mechanism(s) for publishing structured, semantic data that is both machine-readable and human-readable. The White House site has the capability right now to publish such information. Which existing or future information do you expect to see.

Do you see yourself taking the extra steps to give structure to your data.

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7 Comments, please share your thoughts!


[...] Structured Meaning in HTML5 | ClearType Press – Building a Better Government Web  [...]

Sam Johnston Nov 11 2009

This is a great article David, thanks a lot for taking the time to write it.


David editor Nov 11 2009

@Sam: Thanks! It was nice just to get my thoughts together in one place and to clarify what the issues are – at least the technical issues.

I’m still curious what people think about the social or procedural challenges that are keeping authors to embed more data in their pages – have you successfully implemented microformats or RDFa in a large-scale site, especially one with multiple people or teams supporting the site?


[...] Structured Meaning in HTML5 | ClearType Press – Building a Better Government WebIn this post, we examine Microformats that provide real-world design principles, RDFa which enables extensible vocabularies and the new Microdata features of HTML5. All three seek to combine machine-readable data with human-readable content. [...]

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