In the following example we are first using XPath to find a element in given node, however domElementValue() will return null because XPath returns an array, not DOMElement which is expected by domElementValue() function:

->withEntry('name', ref('node')->xpath('name')->domElementValue())

We need to do two things:

1. implement ref('node')->xpath('id')->first() - first function
2. domElementValue should check if value is a single element array of DOMElements and then just grab this element