Atom Feed can’t read Entry content if type is application/xml

[vpashovski]

Feature Request

Q	A
New Feature	yes

Summary

I’m trying to get content of Atom Entry where content is with type="application/xml"

In documentation https://validator.w3.org/feed/docs/atom.html#contentElement
content can have type attribute ends in +xml or /xml , then an xml document of this type is contained inline.

I have this xml:

<entry>
    <content type="application/xml">
        <m:properties>
            <d:Code>10</d:Code>
            <d:shopCode/>
            <d:Description>Some description here</d:Description>
        </m:properties>
    </content>
</entry>

When we use \Laminas\Feed\Reader\Extension\Atom\Entry::getContent method we get empty string.
I’m expecting to get an array with keys and values.

In the code

laminas-feed/src/Reader/Extension/Atom/Entry.php

Lines 86 to 130 in 16d251b

	public function getContent()
	{
	if (array_key_exists('content', $this->data)) {
	return $this->data['content'];
	}
	$content = null;
	$el = $this->getXpath()->query($this->getXpathPrefix() . '/atom:content');
	if ($el->length > 0) {
	$el = $el->item(0);
	$type = $el->getAttribute('type');
	switch ($type) {
	case '':
	case 'text':
	case 'text/plain':
	case 'html':
	case 'text/html':
	$content = $el->nodeValue;
	break;
	case 'xhtml':
	$this->getXpath()->registerNamespace('xhtml', 'http://www.w3.org/1999/xhtml');
	$xhtml = $this->getXpath()
	->query($this->getXpathPrefix() . '/atom:content/xhtml:div')
	->item(0);
	$d = new DOMDocument('1.0', $this->getEncoding());
	$deep = version_compare(PHP_VERSION, '7', 'ge') ? 1 : true;
	$xhtmls = $d->importNode($xhtml, $deep);
	$d->appendChild($xhtmls);
	$content = $this->collectXhtml(
	$d->saveXML(),
	$d->lookupPrefix('http://www.w3.org/1999/xhtml')
	);
	break;
	}
	}
	if (! $content) {
	$content = $this->getDescription();
	}
	$this->data['content'] = trim($content);
	return $this->data['content'];
	}

we can see there is no case for this.