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POhow to get the most deeply nested element nodes using xpath? (implementation with XMLTWIG)
 

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  1. POhow to get the most deeply nested element nodes using xpath? (implementation with XMLTWIG)
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    <p>I need to extract (XSLT, xpath, xquery... Preferably xpath) the <strong>most deeply nested element</strong> nodes with <strong>method</strong> (DEST id="RUSSIA" method="delete"/>) and his direct ancestor (SOURCE id="AFRICA" method="modify">).</p> <p>I don't want to get the top nodes with methods ( main method="modify"> or main method="modify"> ).</p> <p>The deepest nested elements with method correspond to real actions. The top elements with method actually are dummy actions that must not be taken into account.</p> <p>Here is my XML sample file:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;main method="modify"&gt; &lt;MACHINE method="modify"&gt; &lt;SOURCE id="AFRICA" method="modify"&gt; &lt;DEST id="RUSSIA" method="delete"/&gt; &lt;DEST id="USA" method="modify"/&gt; &lt;/SOURCE&gt; &lt;SOURCE id="USA" method="modify"&gt; &lt;DEST id="AUSTRALIA" method="modify"/&gt; &lt;DEST id="CANADA" method="create"/&gt; &lt;/SOURCE&gt; &lt;/MACHINE&gt; &lt;/main&gt; </code></pre> <p>This is Xpath output I expect:</p> <pre><code>&lt;SOURCE id="AFRICA" method="modify"&gt;&lt;DEST id="RUSSIA" method="delete"/&gt; &lt;SOURCE id="AFRICA" method="modify"&gt;&lt;DEST id="USA" method="modify"/&gt; &lt;SOURCE id="USA" method="modify"&gt;&lt;DEST id="AUSTRALIA" method="modify"/&gt; &lt;SOURCE id="USA" method="modify"&gt;&lt;DEST id="CANADA" method="create"/&gt; </code></pre> <p>My current xpath command does not provide the adequate result.</p> <p>Command xpath("//[@method]/ancestor::*") which is returning:</p> <pre><code>&lt;main&gt;&lt;MACHINE method="modify"&gt; # NOT WANTED &lt;MACHINE method="modify"&gt;&lt;SOURCE id="AFRICA" method="modify"&gt; # NOT WANTED &lt;MACHINE method="modify"&gt;&lt;SOURCE id="USA" method="modify"&gt; # NOT WANTED &lt;SOURCE id="AFRICA" method="modify"&gt;&lt;DEST id="RUSSIA" method="delete"/&gt; &lt;SOURCE id="AFRICA" method="modify"&gt;&lt;DEST id="USA" method="modify"/&gt; &lt;SOURCE id="USA" method="modify"&gt;&lt;DEST id="AUSTRALIA" method="modify"/&gt; &lt;SOURCE id="USA" method="modify"&gt;&lt;DEST id="CANADA" method="create"/&gt; </code></pre> <p>My xmltwig code for additional information (context):</p> <pre><code>#!/usr/bin/perl -w use warnings; use XML::Twig; use XML::XPath; @my $t= XML::Twig-&gt;new; my $v= XML::Twig::Elt-&gt;new; $t-&gt; parsefile ('input.xml'); @abc=$t-&gt;get_xpath("\/\/[\@method]\/ancestor\:\:\*") ; foreach $v (@abc) # outer 1 { foreach $v ($v -&gt;children) # internal 1 { $w=$v-&gt;parent; print $w-&gt;start_tag; print $v-&gt;start_tag; } } </code></pre>
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    1. COWe need XSLT if you want to manipulate nodes so XPath alone can't remove ancestors you don't want. Then consider to post well-formed samples of input and output, so for the input sample at least lacks a closing tag and the wanted result is not well-formed at all, it is not clear if you want the `SOURCE` element to contain the `DEST` elements or if you want to flatten the existing hierarchy and output all elements on the same level.
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    2. COI corrected/updated my question. The output file is the result of my xpath command `//[@method]/ancestor::*`. Let me know if it possible with xpath to filter the farthest node with method (and to include his direct ancestor). If not possible (then we use XSLT), I will modify the question by having an XML file as OUTPUT
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    3. COI think finding the most deeply nested elements is not possible with XPath because XPath does not have a `current()` function. Otherwise, the solution would be select all elements for which there are no other elements with a greater number of ancestors. Using XSLT, this can be expressed.
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