XML Topic Maps: Creating and Using Topic Maps for the Web

The XSLT Back-End and Presentation Layers

Now we will look at using XSLT templates from the back-end (query) and presentation layers to extract and visualize metadata and relationships.

Querying Topic Types

The templates in Listing 9-6 call the getTopicRef XSLT template to find instantiated ancestor <topic> elements along certain <instanceOf> channels (see below). In this section, as promised above, we examine how this works. Listing 9-9 shows a code fragment calling the getTopicRef template.

Listing 9-9. XSLT fragment calling the getTopicRef template

<xsl:call-template name="getTopicRef"> <xsl:with-param name="topic" select="key('topic',instanceOf/topicRef/@xlink:href))"/> <xsl:with-param name="ref">#orole</xsl:with-param> </xsl:call-template> ...