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POXQuery fn:deep-equal - comparing text from XPath with string literal
 

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  1. POXQuery fn:deep-equal - comparing text from XPath with string literal
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    <p>I'm trying to use XQuery function <strong>fn:deep-equal</strong> to compare sections of XML documents and I'm getting unexpected behaviour. When comparing XPath value with string literal, function returns false. </p> <p>For example following code</p> <pre><code>let $doc := &lt;root&gt; &lt;child&gt;&lt;message&gt;Hello&lt;/message&gt;&lt;/child&gt; &lt;/root&gt; let $message := &lt;message&gt;Hello&lt;/message&gt; let $value := $doc/child/message/text() let $compareDirectly := fn:deep-equal($value, "Hello") (: -&gt; false :) let $compareAsString := fn:deep-equal(fn:concat($value, ""), "Hello") (: -&gt; true :) let $comparePath := fn:deep-equal($value, $message/text()) (: -&gt; true :) return &lt;results&gt; &lt;value&gt;{$value}&lt;/value&gt; &lt;directly&gt;{$compareDirectly}&lt;/directly&gt; &lt;asString&gt;{$compareAsString}&lt;/asString&gt; &lt;path&gt;{$comparePath}&lt;/path&gt; &lt;/results&gt; </code></pre> <p>Executed using Saxon, XQuery program generates following XML</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;results&gt; &lt;value&gt;Hello&lt;/value&gt; &lt;directly&gt;false&lt;/directly&gt; &lt;asString&gt;true&lt;/asString&gt; &lt;path&gt;true&lt;/path&gt; &lt;/results&gt; </code></pre> <p>I'd expect $compareDirectly to be true (same as two other examples), but fn:deep-equal does not seem to work as I would intuitively expect. I'm wondering whether this is correct behaviour.</p> <p>Is there any better wah how to compare two XML nodes?</p> <p>I'm lookig for some generic solution which could be used for both XML snippets (like values of $doc or $message in example) and also for this special case with string literal.</p>
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