MATLAB: MATLAB 7.10 (R2010a) returns Null when using getElementByID

domgetelementbyididMATLABxmlxmlread

I'm reading an xml file using Matlab's xmlread-function. For some reason searching for elements by id doesn't work for me. Here's an example:
File 'test.xml':
<?xml version="1.0" encoding="utf-8"?>
<Measurements>
    <Setup id="a">
        <myval>3</myval>
    </Setup>
    <Setup id="b">
        <myval>4</myval>
    </Setup>
</Measurements>
>> dom = xmlread('test.xml');
>> dom.getElementsByTagName('Setup')
ans =
org.apache.xerces.dom.DeepNodeListImpl@3e906
>> dom.getElementById('a')
ans =
     []
The first call, searching for elements by tagname works fine, but not searching by id. This should work, according to https://www.w3schools.com/jsref/met_document_getelementbyid.asp
What's going on here?

Best Answer

In MATLAB 7.10 (R2010a), the usage of getElementByID is the same as standard DOM implementation. Having an attribute with name "id" is not of type ID by default. Typically, the element must be inserted in order to be accessed by getElementByID.
Additional information is available here:
https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementById
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