<?xml version="1.0" ?>
<!-- RDFT 2.0 by Jason Diamond <http://injektilo.org/>
|
| Transforms RDF/XML into N-Triples. See <http://www.w3.org/TR/rdf-syntax-grammar>
| and <http://www.w3.org/TR/rdf-testcases/#ntriples> for more information.
|
| This version requires that all RDF attributes be qualified!
|
| Specify the base-uri parameter as the URI for the source document in
| order to resolve relative URIs (currently just rdf:ID attributes).
|
| Import this transform and override the output-statement and
| output-literal-statement named templates to create your own output
| formats.
|
| TODO:
|
| * Reification.
| * Correct URI resolution.
| * Fix bugs.
| * Track RDF Working Draft changes.
| * More helpful error checking.
| * Documentation.
| * More?
|
| HISTORY:
|
| 2002-01-02:
| * First Draft.
+-->
<xsl:transform version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>
<xsl:output method="text" encoding="utf-8" />
<xsl:param name="base-uri" />
<xsl:template match="text()" />
<xsl:template match="text()" mode="node" />
<xsl:template match="text()" mode="property" />
<xsl:template match="rdf:RDF">
<xsl:apply-templates mode="node" />
</xsl:template>
<!-- node elements -->
<xsl:template match="*" mode="node">
<xsl:param name="subject" />
<xsl:param name="predicate" />
<xsl:variable name="id">
<xsl:choose>
<xsl:when test="@rdf:ID">
<xsl:value-of select="concat($base-uri, '#', @rdf:ID)" />
</xsl:when>
<xsl:when test="@rdf:about">
<xsl:value-of select="@rdf:about" />
</xsl:when>
<xsl:when test="@ID">
<xsl:message terminate="yes">error: encountered unqualified ID attribute!</xsl:message>
</xsl:when>
<xsl:when test="@about">
<xsl:message terminate="yes">error: encountered unqualified about attribute!</xsl:message>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="concat('_:', generate-id())" />
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:if test="not(self::rdf:Description)">
<xsl:call-template name="output-type-statement">
<xsl:with-param name="subject" select="$id" />
<xsl:with-param name="object">
<xsl:call-template name="check-li" />
</xsl:with-param>
</xsl:call-template>
</xsl:if>
<xsl:if test="$subject and $predicate">
<xsl:call-template name="output-statement">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="predicate" select="$predicate" />
<xsl:with-param name="object" select="$id" />
</xsl:call-template>
</xsl:if>
<xsl:apply-templates select="@*" mode="property">
<xsl:with-param name="subject" select="$id" />
</xsl:apply-templates>
<xsl:apply-templates mode="property">
<xsl:with-param name="subject" select="$id" />
</xsl:apply-templates>
</xsl:template>
<!-- property elements -->
<xsl:template match="*[*]" mode="property">
<xsl:param name="subject" />
<xsl:variable name="predicate">
<xsl:call-template name="check-li" />
</xsl:variable>
<xsl:apply-templates mode="node">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="predicate" select="$predicate" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="*[not(*)][text()]" mode="property">
<xsl:param name="subject" />
<xsl:variable name="predicate">
<xsl:call-template name="check-li" />
</xsl:variable>
<xsl:call-template name="output-literal-statement">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="predicate" select="$predicate" />
<xsl:with-param name="object" select="." />
</xsl:call-template>
</xsl:template>
<xsl:template match="*[not(node())]" mode="property">
<xsl:param name="subject" />
<xsl:variable name="predicate">
<xsl:call-template name="check-li" />
</xsl:variable>
<xsl:choose>
<xsl:when test="not(@*) or (@rdf:ID and count(@*) = 1)">
<xsl:call-template name="output-literal-statement">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="predicate" select="$predicate" />
<xsl:with-param name="object" select="''" />
</xsl:call-template>
</xsl:when>
<xsl:when test="@rdf:resource and count(@*) = 1">
<xsl:call-template name="output-statement">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="predicate" select="$predicate" />
<xsl:with-param name="object" select="@rdf:resource" />
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="id">
<xsl:choose>
<xsl:when test="@rdf:resource">
<xsl:value-of select="@rdf:resource" />
</xsl:when>
<xsl:when test="@rdf:ID">
<xsl:value-of select="concat($base-uri, '#', @rdf:ID)" />
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="concat('_:', generate-id())" />
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="property-attributes">
<xsl:apply-templates select="@*" mode="property">
<xsl:with-param name="subject" select="$id" />
</xsl:apply-templates>
</xsl:variable>
<xsl:if test="$property-attributes">
<xsl:call-template name="output-statement">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="predicate" select="$predicate" />
<xsl:with-param name="object" select="$id" />
</xsl:call-template>
<xsl:copy-of select="$property-attributes" />
</xsl:if>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<!-- property attributes -->
<xsl:template match="@rdf:RDF" mode="property" />
<xsl:template match="@rdf:Description" mode="property" />
<xsl:template match="@rdf:ID" mode="property" />
<xsl:template match="@rdf:about" mode="property" />
<xsl:template match="@rdf:bagID" mode="property" />
<xsl:template match="@rdf:parseType" mode="property" />
<xsl:template match="@rdf:resource" mode="property" />
<xsl:template match="@rdf:li" mode="property" />
<xsl:template match="@rdf:type" mode="property">
<xsl:param name="subject" />
<xsl:call-template name="output-type-statement">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="object" select="." />
</xsl:call-template>
</xsl:template>
<xsl:template match="@*" mode="property">
<xsl:param name="subject" />
<xsl:call-template name="output-literal-statement">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="predicate" select="concat(namespace-uri(), local-name())" />
<xsl:with-param name="object" select="." />
</xsl:call-template>
</xsl:template>
<!-- helper templates -->
<xsl:template name="check-li">
<xsl:variable name="id" select="concat(namespace-uri(), local-name())" />
<xsl:choose>
<xsl:when test="$id = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#li'">
<xsl:value-of select="concat('http://www.w3.org/1999/02/22-rdf-syntax-ns#_', 1 + count(preceding-sibling::rdf:li))" />
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$id" />
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="output-type-statement">
<xsl:param name="subject" />
<xsl:param name="object" />
<xsl:call-template name="output-statement">
<xsl:with-param name="subject" select="$subject" />
<xsl:with-param name="predicate" select="'http://www.w3.org/1999/02/22-rdf-syntax-ns#type'" />
<xsl:with-param name="object" select="$object" />
</xsl:call-template>
</xsl:template>
<xsl:template name="output-statement">
<xsl:param name="subject" />
<xsl:param name="predicate" />
<xsl:param name="object" />
<xsl:if test="not(starts-with($subject, '_:'))">
<xsl:text><</xsl:text>
</xsl:if>
<xsl:value-of select="$subject" />
<xsl:if test="not(starts-with($subject, '_:'))">
<xsl:text>></xsl:text>
</xsl:if>
<xsl:text> <</xsl:text>
<xsl:value-of select="$predicate" />
<xsl:text>> </xsl:text>
<xsl:if test="not(starts-with($object, '_:'))">
<xsl:text><</xsl:text>
</xsl:if>
<xsl:value-of select="$object" />
<xsl:if test="not(starts-with($object, '_:'))">
<xsl:text>></xsl:text>
</xsl:if>
<xsl:text> . </xsl:text>
</xsl:template>
<xsl:template name="output-literal-statement">
<xsl:param name="subject" />
<xsl:param name="predicate" />
<xsl:param name="object" />
<xsl:if test="not(starts-with($subject, '_:'))">
<xsl:text><</xsl:text>
</xsl:if>
<xsl:value-of select="$subject" />
<xsl:if test="not(starts-with($subject, '_:'))">
<xsl:text>></xsl:text>
</xsl:if>
<xsl:text> <</xsl:text>
<xsl:value-of select="$predicate" />
<xsl:text>> "</xsl:text>
<xsl:value-of select="$object" />
<xsl:text>" . </xsl:text>
</xsl:template>
</xsl:transform>
) is private.
