How does one use LibreOffice FILTERXML function on XML documents with namespaces?

I'm struggling to get the value of an XML node using the FilterXML() function when the XML document's document element has a namespace specified.

Example:

<?xml version="1.0" encoding="UTF-8"?>
<DocumentElement xmlns="XMLSchemaDefinition.xsd">
    <Field>
        <Value>100</Value>
    </Field>
</DocumentElement>

= FILTERXML(A1, "/Document/Element/Value[1]")

I managed to get FilterXML working by removing the namespace in the following maer:

= FILTERXML(SUBSTITUTE(A1, "<DocumentElement xmlns=""XMLSchemaDefinition.xsd"">", "<DocumentElement>"), "/DocumentElement/Field/Value[1]")

Is there a way to get the value of the XML node without having to remove the namespace(s)?

I'm currently using LibreOffice Version: 5.0.5.2

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