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POXpath in XSLT: select elements that are between 2 other elements, part II
 

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  1. POXpath in XSLT: select elements that are between 2 other elements, part II
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    <p>As similar to this question (there are more related entries, however as a new user I can only post one URL): <a href="https://stackoverflow.com/questions/1489326/xpath-get-elements-that-are-between-2-elements">Xpath Get elements that are between 2 elements</a></p> <p>I have a question regarding the selection of set of elements that occur between 'other / delimiting' elements. This situation occurs when trying to transform a flat HTML table to a hierarchic XML structure using XSLT. I tried using recursion in the templates, but saxon refused to accept this as it resulted in a dead-lock, most probably my fault, but let's start at the beginning. </p> <p>First the source data is the HTML table:</p> <pre><code>&lt;table &gt; &lt;thead&gt; &lt;tr&gt; &lt;th&gt;Column 1&lt;/th&gt; &lt;th&gt;Column 2&lt;/th&gt; &lt;th&gt;Column 3&lt;/th&gt; &lt;/tr&gt; &lt;/thead&gt; &lt;tbody&gt; &lt;tr&gt; &lt;th colspan="3" &gt;Group 1&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;attribute 1.1.1&lt;/td&gt; &lt;td&gt;attribute 1.1.3&lt;/td&gt; &lt;td&gt;attribute 1.1.2&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;attribute 1.2.1&lt;/td&gt; &lt;td&gt;attribute 1.2.2&lt;/td&gt; &lt;td&gt;attribute 1.2.3&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;attribute 1.3.1&lt;/td&gt; &lt;td&gt;attribute 1.3.2&lt;/td&gt; &lt;td&gt;attribute 1.3.3&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;th colspan="3" &gt;Group 2&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;attribute 2.1.1&lt;/td&gt; &lt;td&gt;attribute 2.1.3&lt;/td&gt; &lt;td&gt;attribute 2.1.2&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;attribute 2.2.1&lt;/td&gt; &lt;td&gt;attribute 2.2.2&lt;/td&gt; &lt;td&gt;attribute 2.2.3&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;attribute 2.3.1&lt;/td&gt; &lt;td&gt;attribute 2.3.2&lt;/td&gt; &lt;td&gt;attribute 2.3.3&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;/table&gt; </code></pre> <p>The targeted output in XML would be:</p> <pre><code> &lt;groups&gt; &lt;group name="Group 1"&gt; &lt;item attribute1="attribute 1.1.1" attribute2="attribute 1.1.3" attribute3="attribute 1.1.2"/&gt; &lt;item attribute1="attribute 1.2.1" attribute2="attribute 1.2.2" attribute3="attribute 1.2.3"/&gt; &lt;item attribute1="attribute 1.3.1" attribute2="attribute 1.3.2" attribute3="attribute 1.3.3"/&gt; &lt;/group&gt; &lt;group name="Group 2"&gt; &lt;item attribute1="attribute 2.1.1" attribute2="attribute 2.1.3" attribute3="attribute 2.1.2"/&gt; &lt;item attribute1="attribute 2.2.1" attribute2="attribute 2.2.2" attribute3="attribute 2.2.3"/&gt; &lt;item attribute1="attribute 2.3.1" attribute2="attribute 2.3.2" attribute3="attribute 2.3.3"/&gt; &lt;/group&gt; &lt;/groups&gt; </code></pre> <p>So I want to have all the item entries, (TR elements) and add them to a group. This basically comes down to select all following-sibling TR elements until we encounter one that has a TH element as a child. If I could only determine the position of this first TR that has a TH child, indicating a new heading for a group, this could be done with: </p> <pre><code>&lt;xsl:for-each select="tbody/tr"&gt; &lt;xsl:if test="th"&gt; &lt;xsl:element name="group"&gt; &lt;xsl:attribute name="name"&gt;&lt;xsl:value-of select="th"/&gt;&lt;/xsl:attribute&gt; &lt;xsl:for-each select="following-sibling::tr[position() &lt; $positionOfNextThElement]"&gt; &lt;xsl:call-template name="item"/&gt; &lt;/xsl:for-each&gt; &lt;/xsl:element&gt; &lt;/xsl:if&gt; &lt;/xsl:for-each&gt; </code></pre> <p>However, I am not able to determine the position of the first encountered TR/TH tag. </p> <p>As stated I tried working with recursion in templates: always call the "item" template and in this template determine whether we want to invoke it on the next item as well. I think the problem is in the invocation of the template from within the template. The item in context does not increase? Should I hand over a parameter to determine what item we are working on?</p> <p>Anyhow, this was what I came up with: </p> <pre><code>&lt;xsl:for-each select="tbody/tr"&gt; &lt;xsl:if test="th"&gt; &lt;xsl:element name="group"&gt; &lt;xsl:attribute name="name"&gt;&lt;xsl:value-of select="th"/&gt;&lt;/xsl:attribute&gt; &lt;xsl:call-template name="item"/&gt; &lt;/xsl:element&gt; &lt;/xsl:if&gt; &lt;/xsl:for-each&gt; &lt;xsl:template name="item"&gt; &lt;xsl:element name="item"&gt; &lt;xsl:attribute name="attribute1"&gt;&lt;xsl:value-of select="following-sibling::tr[1]/td[1]"/&gt;&lt;/xsl:attribute&gt; &lt;xsl:attribute name="attribute2"&gt;&lt;xsl:value-of select="following-sibling::tr[1]/td[2]"/&gt;&lt;/xsl:attribute&gt; &lt;xsl:attribute name="attribute2"&gt;&lt;xsl:value-of select="following-sibling::tr[1]/td[3]"/&gt;&lt;/xsl:attribute&gt; &lt;/xsl:element&gt; &lt;!-- When the next element has not got a TH tag, continue with invoking this template --&gt; &lt;xsl:if test="count(following-sibling::tr[1]/th) != 1"&gt; &lt;xsl:call-template name="item"/&gt; &lt;/xsl:if&gt; &lt;/xsl:template&gt; </code></pre> <p>Any suggestions on how to realize this are welcome!</p>
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