[uf-discuss] RFC: Proposal for general purpose microformat
Ryan King
ryan at technorati.com
Fri Dec 2 10:47:55 PST 2005
On Dec 2, 2005, at 2:30 AM, Abramo Bagnara wrote:
> Taken for granted that a microformat is a way to embed data inside
> xhtml
> presentation, last night I was wondering if really it was
> unavoidable to
> have so many different formats with complex rules and nasty
> exceptions.
Whether or not its unavoidable to have "so many different formats"
depends on what the goal is. In the case of hCard and hCalendar, we
put up with the complexity of the existing formats so that we can
create reasonable transformations between the two.
>> From this thinking I've tried to develop a little proposal to embed
> arbitrary xml data inside xhtml and that may be extracted easily and
> without ambiguities while leaving total freedom on data presentation.
Have you looked around to see who else has done this?
> My main interest was something similar to hcalendar to overcome
> current
> limitations of this microformat wrt params.
Why not propose a fix to hcalendar, rather than starting from scratch?
> This is the reason why you find that the attached test is for calendar
> data, but my proposal should be general enough to permit embedding of
> *any* xml data.
Ok, you can certainly extract semantics this way, but I think there's
a few shortcomings here:
1. without a shared vocabulary, what do you do with the data you get?
2. how do you deal with overlaid schemas? Those won't map reliably to
xml.
> The attached stylesheet is for extraction of data in xml form, but it
> might be easily modified to extract data in xCalendar or iCalendar
> format (that maps 1:1 to xml).
Which xCalendar. I believe there's about 6 formats referred to as
"xCalendar".
> --
> Abramo Bagnara mailto:abramobagnara at tin.it
>
> Opera Unica Phone: +39.0546.656023
> Via Emilia Interna, 140
> 48014 Castel Bolognese (RA) - Italy
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
> <html xmlns="http://www.w3.org/1999/xhtml">
> <head>
> <meta http-equiv="Content-Type" content="text/html;
> charset=ISO-8859-1" />
> <title>Test</title>
> <link type="text/css" rel="stylesheet" href="../../html/
> project.css" />
> </head>
> <body class="xx:vcalendar=">
> <div class="xx:vtodo=">
> <h2 class="xx:summary">Task di test</h2>
> <div>
> <span class="header">Location: </span>
> <span class="xx:location">Location</span>
> </div>
> <div>
> <b>Due date: </b>
> <abbr class="xx:due=@title" title="20051130">30-11-2005</abbr>
> </div>
> <div class="xx:description">
> <div class="ancestor-summary">Test</div>
> <ol class="disc">
> <li>
> <div class="node-summary">
> <a href="edit:/u/dothert/data/abramo/
> test.txt##18">Task di test</a>
> </div>
> <div class="node-location">Location</div>
> <div class="node-description">
> <p>Descrizione sotto divisa in paragrafi di una certa
> lunghezza di una
> certa lunghezza di una certa <b>lunghezza</b> di una certa
> lunghezza di una
> certa lunghezza di una certa lunghezza</p>
> <p>Descrizione sotto divisa in paragrafi di una certa
> lunghezza di una
> certa lunghezza di una certa lunghezza di una certa lunghezza di una
> certa lunghezza di una certa lunghezza</p>
> <p>Descrizione sotto divisa in paragrafi di una certa
> lunghezza di una
> certa lunghezza di una certa lunghezza di una certa lunghezza di una
> certa lunghezza di una certa lunghezza</p>
> </div>
> </li>
> </ol>
> <p>Descrizione della deadline</p>
> <p>Descrizione sotto divisa in paragrafi di una certa
> lunghezza di una
> certa lunghezza di una certa lunghezza di una certa lunghezza di una
> certa lunghezza di una certa lunghezza</p>
> <p>Descrizione sotto divisa in paragrafi di una certa
> lunghezza di una
> certa lunghezza di una certa lunghezza di una certa lunghezza di una
> certa lunghezza di una certa lunghezza</p>
> </div>
> <div><span class="header">Categories: </span><span
> class="xx:categories">a</span>, <span class="xx:categories">a:b</
> span>, <span class="xx:categories">a:b:c</span>, <span
> class="xx:categories">ismaele</span>, <span
> class="xx:categories">ismaele:opt</span>, <span
> class="xx:categories">licia</span>, <span
> class="xx:categories">licia:opt</span>, <span
> class="xx:categories">abramo</span>, <span
> class="xx:categories">abramo:cha</span>, <span
> class="xx:categories">test</span>, <span
> class="xx:categories">abramo</span></div>
> <div>
> <span class="header">Priority: </span>
> <abbr class="xx:priority=@title" title="0">not specified</
> abbr>
> </div>
> <div>
> <span class="header">Presidente: </span>
> <span class="xx:attendee=">
> <abbr class="xx:@role=@title" title="chair"></abbr>
> <a class="xx:@cn xx:=@href"
> href="mailto:abramo.bagnara at gmail.com">Abramo Bagnara</a>
> </span>
> </div>
> <div>
> <span class="header">Partecipanti opzionali: </span>
> <span class="xx:attendee=">
> <abbr class="xx:@role=@title" title="opt-participant"></abbr>
> <a class="xx:@cn xx:=@href" href="mailto:">Ismaele
> Bagnara</a>
> </span>, <span class="xx:attendee="><abbr
> class="xx:@role=@title"
> title="opt-participant"></abbr>
> <a class="xx:@cn xx:=@href"
> href="litabanelli at racine.ra.it">Licia Tabanelli</a></span></div>
> </div>
> </body>
> </html>
> <?xml version="1.0"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
>
> <!--
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> xmlns:dyn="http://exslt.org/dynamic"
> extension-element-prefixes="dyn">
> -->
>
> <!--
> Extract xml embedded in xhtml.
> First draft.
>
> Copyright 2005 Abramo Bagnara <abramo.bagnara at gmail.com>
> -->
>
> <xsl:output method="xml"
> indent="yes"/>
>
> <xsl:variable name="prefix" select="' xx:'"/>
>
> <!--
> <xsl:template name="dyn-evaluate">
> <xsl:param name="xpath"/>
> <xsl:for-each select="dyn:evaluate($xpath)">
> <xsl:value-of select="."/>
> </xsl:for-each>
> </xsl:template>
> -->
>
> <xsl:template name="dyn-evaluate">
> <xsl:param name="xpath"/>
> <xsl:choose>
> <xsl:when test="$xpath='.//text()'">
> <xsl:for-each select=".//text()">
> <xsl:value-of select="."/>
> </xsl:for-each>
> </xsl:when>
> <xsl:when test="$xpath='text()'">
> <xsl:for-each select="text()">
> <xsl:value-of select="."/>
> </xsl:for-each>
> </xsl:when>
> <xsl:when test="starts-with($xpath,'@')">
> <xsl:value-of select="@*[name()=substring($xpath,2)]"/>
> </xsl:when>
> <xsl:otherwise>
> <xsl:for-each select="*[name()=$xpath]">
> <xsl:value-of select="."/>
> </xsl:for-each>
> </xsl:otherwise>
> </xsl:choose>
> </xsl:template>
>
> <xsl:template name="evaluate">
> <xsl:param name="xpath"/>
> <xsl:if test="$xpath != ''">
> <xsl:call-template name="dyn-evaluate">
> <xsl:with-param name="xpath" select="$xpath"/>
> </xsl:call-template>
> </xsl:if>
> </xsl:template>
>
> <!--
> class : destination
> | destination '=' source
> ;
>
> prefix : 'xx:' ;
>
> destination : name
> | '@' name
> ;
>
> source : ''
> | xpath
> ;
> -->
>
> <xsl:template name="extract">
> <xsl:param name="classes"/>
> <xsl:variable name="c" select="substring-after(concat(' ',
> $classes),$prefix)"/>
> <xsl:choose>
> <xsl:when test="$c = ''">
> <xsl:apply-templates/>
> </xsl:when>
> <xsl:otherwise>
> <xsl:variable name="class" select="substring-before(concat
> ($c,' '),' ')"/>
> <xsl:variable name="destination" select="substring-before
> (concat($class,'='),'=')"/>
> <xsl:variable name="source">
> <xsl:choose>
> <xsl:when test="contains($class,'=')">
> <xsl:value-of select="substring-after($class,'=')"/>
> </xsl:when>
> <xsl:otherwise>.//text()</xsl:otherwise>
> </xsl:choose>
> </xsl:variable>
> <xsl:choose>
> <xsl:when test="$destination = ''">
> <xsl:call-template name="evaluate">
> <xsl:with-param name="xpath" select="$source"/>
> </xsl:call-template>
> <xsl:call-template name="extract">
> <xsl:with-param name="classes" select="substring-after
> ($c,' ')"/>
> </xsl:call-template>
> </xsl:when>
> <xsl:when test="starts-with($destination,'@')">
> <xsl:attribute name="{substring($destination,2)}">
> <xsl:call-template name="evaluate">
> <xsl:with-param name="xpath" select="$source"/>
> </xsl:call-template>
> </xsl:attribute>
> <xsl:call-template name="extract">
> <xsl:with-param name="classes" select="substring-after
> ($c,' ')"/>
> </xsl:call-template>
> </xsl:when>
> <xsl:otherwise>
> <xsl:element name="{$destination}">
> <xsl:call-template name="evaluate">
> <xsl:with-param name="xpath" select="$source"/>
> </xsl:call-template>
> <xsl:call-template name="extract">
> <xsl:with-param name="classes" select="substring-after
> ($c,' ')"/>
> </xsl:call-template>
> </xsl:element>
> </xsl:otherwise>
> </xsl:choose>
> </xsl:otherwise>
> </xsl:choose>
> </xsl:template>
>
> <xsl:template match="*[@class]">
> <xsl:call-template name="extract">
> <xsl:with-param name="classes" select="@class"/>
> </xsl:call-template>
> </xsl:template>
>
> <xsl:template match="text()"/>
>
> </xsl:stylesheet>
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--
Ryan King
ryan at technorati.com
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