XPath to select value of an attribute using namespace

Question

Hi I'm having a problem getting the value of an attribute in an xml file using namespaces.

<module name="ietf-inet-types" xmlns="urn:ietf:params:xml:ns:yang:yin:1" xmlns:inet="urn:ietf:params:xml:ns:yang:ietf-inet-types"> <namespace uri="urn:ietf:params:xml:ns:yang:ietf-inet-types"/> <prefix value="inet"/> </module>

I want to get "inet" as the result of my xpath. I used this link Xpath to select value of sibling attribute with namespace as a reference and came up with:

$xml->xpath('/n:module/n:prefix/@n:value');

where n is the namespace prefix. However I'm getting an empty array as a result, what exactly am I doing wrong here?

Update: Heres some of the php code I'm using to retrieve the value.

//gets the namespace from the model $xpathNamespace = getXpathNamespace($domxml); $xml = simplexml_load_string($domxml->saveXML()); $xml->registerXPathNamespace("n", $xpathNamespace); print_r($xml->xpath('/n:module/n:prefix/@n:value'));

Richard · Accepted Answer · 2016-02-12 14:21:21Z

1

In XML attributes without a namespace tag (eg. value) are not in any namespace: default namespace does not apply to attributes.

Try the XPath:

/n:module/n:prefix/@value

answered Feb 12, 2016 at 14:21

Richard

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4 Comments

olliejjc16 Over a year ago

Hi I tried that but got the same result as when I use the xpath /n:module/n:prefix/. The result is: Array ( [0] => SimpleXMLElement Object ( [@attributes] => Array ( [value] => inet ) ) )

Richard Over a year ago

@olliejjc16 In which case, could you update the question with the code you are using (specifically how you are associating n with the namespace in the XPath processor: but make it a complete but minimal re-create).

har07 Over a year ago

@olliejjc16 This might give some light : Can I use SimpleXML & Xpath to directly select an Elements Attribute?

olliejjc16 Over a year ago

Thanks lads for the help, got it sorted between the information you both provided!

olliejjc16 · Accepted Answer · 2016-02-12 14:53:30Z

Ok here's the solution thanks to both Richard and har07 combined for the help. To access the value of the prefix I used the below xpath suggested by Richard. From the information in the link posted by har7 I accessed the first element in the array and converted it to a string and I got the value "inet". Heres the code:

$prefix = $xml->xpath('/n:module/n:prefix/@value'); print_r((string)$prefix[0]);

Thanks to both for the help!

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