Question

XPath Query in PHP: Get Value of Element in Document with Namespace

Asked by: dbnewbie

How do I get the text node associated with the element ReturnObject? In the attached snippet, I need the following string: 8b020dc7-7e3d-46d7-9f95-9f11d06dc475

All the examples I've seen seem to query simple XML documents. None show how to query something with a namespace. SimpleXMLElement seems to allow me to register namespaces, but I am not getting the results I think I should be getting. Can anyone help?

 I do not want a RegEx solution. I need to execute this query via XPath.

$MyXmlDocument = new SimpleXMLElement("<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema'><soap:Header><ResponseHeader xmlns='https://secure.paymex.co.nz/payment/'><IsError>false</IsError><Message>Payment Success</Message><HasReturnObject>true</HasReturnObject><ReturnObjectDescription>Customer id</ReturnObjectDescription><ReturnObject xmlns:q1='http://microsoft.com/wsdl/types/' xsi:type='q1:guid'>8b020dc7-7e3d-46d7-9f95-9f11d06dc475</ReturnObject></ResponseHeader></soap:Header><soap:Body><RegisterSubscriptionResponse xmlns='https://secure.paymex.co.nz/payment/'><RegisterSubscriptionResult>0</RegisterSubscriptionResult></RegisterSubscriptionResponse></soap:Body></soap:Envelope>");
	$MyXmlDocument->registerXPathNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
	$MyXmlDocument->registerXPathNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
	$MyXmlDocument->registerXPathNamespace("xsd", "http://www.w3.org/2001/XMLSchema");
	$MyXmlDocument->registerXPathNamespace("q1", "http://microsoft.com/wsdl/types/");
	
	$MyXpath = "//ReturnObject";
	$results = $MyXmlDocument->xpath($MyXpath);

                                  
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Asked On
2008-05-16 at 18:38:50ID23410099
Tags

XML, XPath, PHP

Topics

PHP Scripting Language

,

Extensible Markup Language (XML)

Participating Experts
1
Points
125
Comments
4

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Answers

 

by: dbnewbiePosted on 2008-05-16 at 18:39:30ID: 21587670

Here's the XML:


 
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
        <soap:Header>
                <ResponseHeader xmlns="http://www.domain.com/">
                        <IsError>false</IsError>
                        <Message>Payment Success</Message>
                        <HasReturnObject>true</HasReturnObject>
                        <ReturnObjectDescription>Customer id</ReturnObjectDescription>
                        <ReturnObject xmlns:q1="http://microsoft.com/wsdl/types/" xsi:type="q1:guid">8b020dc7-7e3d-46d7-9f95-9f11d06dc475</ReturnObject>
                </ResponseHeader>
        </soap:Header>
        <soap:Body>
                <RegisterSubscriptionResponse xmlns="http://www.domain.com/">
                        <RegisterSubscriptionResult>0</RegisterSubscriptionResult>
                </RegisterSubscriptionResponse>
        </soap:Body>
</soap:Envelope>

                                              
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by: dbnewbiePosted on 2008-05-16 at 22:19:27ID: 21588071

Here's another attempt that doesn't work. The XPath seems good to me, but I get nothing back. I think it must have something to do with the namespaces.

	$MyDomDocument = new DOMDocument;
	$MyDomDocument->loadXML("<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema'><soap:Header><ResponseHeader xmlns='http://www.domain.com/'><IsError>false</IsError><Message>Payment Success</Message><HasReturnObject>true</HasReturnObject><ReturnObjectDescription>Customer id</ReturnObjectDescription><ReturnObject xmlns:q1='http://microsoft.com/wsdl/types/' xsi:type='q1:guid'>8b020dc7-7e3d-46d7-9f95-9f11d06dc475</ReturnObject></ResponseHeader></soap:Header><soap:Body><RegisterSubscriptionResponse xmlns='http://www.domain.com/'><RegisterSubscriptionResult>0</RegisterSubscriptionResult></RegisterSubscriptionResponse></soap:Body></soap:Envelope>");
	
	$MyDomXPath = new DOMXPath($MyDomDocument);
	
	$MyDomXPath->registerNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
	$MyDomXPath->registerNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
	$MyDomXPath->registerNamespace("xsd", "http://www.w3.org/2001/XMLSchema");
	$MyDomXPath->registerNamespace("q1", "http://microsoft.com/wsdl/types/");
	
	$MyXPathQuery = "//ReturnObject";
	
	$MyDomNodeList = $MyDomXPath->query($MyXPathQuery);
	
	foreach ($MyDomNodeList as $DomNodeItem) {
		echo ("Node value is: ".$DomNodeItem->nodeValue." <br/>");
	}

                                              
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by: GertonePosted on 2008-05-17 at 00:07:06ID: 21588247

I did not read this in detail, and I am not PHP developer at all,
but at first glance you seem to be missing a namespace declaration for
xmlns="http://www.domain.com/"
you can't pass a default namespace , so you will have to invent a prefix for that

      $MyDomXPath->registerNamespace("dom", "http://www.domain.com/");

and then consequently prefix all the nodes in tha namespace

$MyXpath = "//dom:ReturnObject";

 

by: dbnewbiePosted on 2008-05-17 at 07:20:14ID: 31458843

Default namespace! Doh!!!

20120131-EE-VQP-002

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