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Daniel K. Schneider at 18:00, 8 July 2009

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== Definition ==

* {{quotation | XHTML is built on XML, and thus XHTML-based formats can be used not only for convenient display presentation, but also for general-purpose data exchange. In many ways, XHTML-based formats exemplify the best of both HTML and XML worlds. However, when building XHTML-based formats, it helps to have a guiding set of principles.}} ([http://microformats.org/wiki/SemanticXHTMLDesignPrinciples Semantic XHTML Design Principles], retrieved 15:46, 12 April 2007 (MEST))

See also: [[Microformat]]s (for a global perspective) and [[semantic web]] for an opposite, more heavy approach.

== Design Principles ==

According to [http://microformats.org/wiki/SemanticXHTMLDesignPrinciples Semantic XHTML Design Principles], the design principles (reproduced in simplified form here) are:

# Reuse schema (names, objects, properties, values, types, hierarchies, constraints) as much as possiblefrom pre-existing, established, well-supported standards by reference. (and don't restate constraints expressed in the source standard, informative mentions are ok).
# Use the most accurately precise semantic XHTML building block for each object. E.g. use the "address" tag for a contact information, "h2" for a section title.
# Otherwise use a generic structural element (e.g. ''span'' or ''div''), or the appropriate contextual element (e.g. an ''li'' inside a ''ul'' or ''ol'').
# Base class names on the original schema.

[[Microformat]]s use semantic XHTML, but not all uses of semantic XHTML are microformats.

=== Simple example ===
Source: [http://www.tantek.com/presentations/2004etech/realworldsemanticspres.html Real world semantics], retrieved 15:46, 12 April 2007 (MEST).

<table border="1">
<tr><th>presentational</th> <th>semantic</th></tr>
<tr><td><br></td> <td><p></td></tr>
<tr><td><font></td> <td><h1>,<h2>,<h3></td></tr>
<tr><td><i>,<b></td> <td><em>,<strong></td></tr>
</table>

== Links ==

; Web sites

* [http://microformats.org/wiki/microformats Microformats Wiki] (best resource)

* [http://microformats.org/ Microformats] blog

; Talks and web pages

* [http://microformats.org/about/ About microformats]

* [http://www.whump.com/moreLikeThis/link/04069 Lossless XHTML] (blog entry by Bill Humphries)

* [http://tantek.com/presentations/2005/09/elements-of-xhtml/ The Elements of Meaningful XHTML]. Slides by Tantek Çelik, Chief Technologist Technorati

* [http://www.tantek.com/presentations/2004etech/realworldsemanticspres.html Real world semantics] by Tantek çelik and Kevin Mar, slides 2004

[[Category: Standards]]
[[Category: XML]]

Semantic XHTML - Revision history

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Daniel K. Schneider: 1 revision imported

Daniel K. Schneider at 18:00, 8 July 2009