Question

This is the result I’d like to have:

<?xml version="1.0" encoding="utf-8"?>
<types>
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"/>
</types>

but using the straightforward solution:

$document = new DOMDocument('1.0', 'utf-8');

$schema = $document->createElementNS('http://www.w3.org/2001/XMLSchema', 'xs:schema');

$types = $document->createElement('types');
$types->appendChild($schema);

$document->appendChild($types);

echo $document->saveXML();

I only get this:

<?xml version="1.0" encoding="utf-8"?>
<types xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"/>
</types>

What am I missing?

Answer 1

The problem is in order of appending children. Try this:

$document = new DOMDocument('1.0', 'utf-8');

$types = $document->createElement('types');
$schema = $document->createElementNS('http://www.w3.org/2001/XMLSchema', 'xs:schema');

$document->appendChild($types);
$types->appendChild($schema);

echo $document->saveXML();