My XML document starts like :
<?xml version='1.0' encoding='UTF-8'?>
<article xmlns:d="http://docbook.org/ns/docbook"
xmlns="http://docbook.org/ns/docbook"
version="5.0">
<info>
<title>My title</title>
<annotation>
<segmentedlist>
<segtitle>role</segtitle>
<segtitle>id</segtitle>
<segtitle>description</segtitle>
<seglistitem>
<seg>input</seg>
<seg>hash123</seg>
<seg>INPUT</seg>
</seglistitem>
</segmentedlist>
</annotation>
</info>
<simpara/>
</article>
I need to find elements with xpath queries like :
var inputList = currentDocument.evaluate("//annotation/segmentedlist/seglistitem/seg",
currentDocument,
null,
XPathResult.ANY_TYPE,null);
Because of default namespace xmlns="http://docbook.org/ns/docbook" associated to another explicit namespace, the namespace resolver fails when evaluating xpath expressions.
As I understand the note in https://developer.mozilla.org/en-US/docs/Web/XPath/Introduction_to_using_XPath_in_JavaScript#implementing_a_default_namespace_resolver , there is no simple pattern to support "normal xpath expression" with such a declaration of namespaces. Proposed solution using "namespace-uri()=[...]" seems to complexify xpath expressions.
Anyone has a pattern to propose ?
Use XPath 3.1 with Saxon-JS 2 (https://www.saxonica.com/saxon-js/documentation2/index.html):
const xml = `<?xml version='1.0' encoding='UTF-8'?>
<article xmlns:d="http://docbook.org/ns/docbook"
xmlns="http://docbook.org/ns/docbook"
version="5.0">
<info>
<title>My title</title>
<annotation>
<segmentedlist>
<segtitle>role</segtitle>
<segtitle>id</segtitle>
<segtitle>description</segtitle>
<seglistitem>
<seg>input</seg>
<seg>hash123</seg>
<seg>INPUT</seg>
</seglistitem>
</segmentedlist>
</annotation>
</info>
<simpara/>
</article>`;
const xmlDoc = new DOMParser().parseFromString(xml, 'application/xml');
const segElements = SaxonJS.XPath.evaluate('//annotation/segmentedlist/seglistitem/seg', xmlDoc , { 'xpathDefaultNamespace' : 'http://docbook.org/ns/docbook' });
console.log(segElements.length, segElements);<script src="https://www.saxonica.com/saxon-js/documentation2/SaxonJS/SaxonJS2.rt.js"></script>