[PHP] SimpleXML and xpath woes

[Simon Turvey]

Hi all,

(Apologies for the larger than normal wrapping - there are some long lines)

I'm playing with SimpleXML for reading REST responses from Amazon Web Services.
Having successfuly read the response to my request I'd like to perform an xpath 
query
on the result.  I've pared down the original response to a static XML file for 
testing
purposes containing the following:

<ItemLookupResponse 
xmlns="http://webservices.amazon.com/AWSECommerceService/2005-02-23";>
        <OperationRequest>
                <HTTPHeaders>
                        <Header Name="UserAgent"/>
                </HTTPHeaders>
                <RequestId>0MTRFP41HYDBPAEM41Q5</RequestId>
                <Arguments>
                        <Argument Name="Service" Value="AWSECommerceService"/>
                        <Argument Name="SubscriptionId" 
Value="055S8QK9GNAKPNMYQZ02"/>
                        <Argument Name="ItemId" Value="0201788977"/>
                        <Argument Name="Operation" Value="ItemLookup"/>
                
</Arguments><RequestProcessingTime>0.0166029930114746</RequestProcessingTime>
        </OperationRequest>
        <Items>
                <Request>
                        <IsValid>True</IsValid>
                        <ItemLookupRequest>
                                <ItemId>0201788977</ItemId>
                        </ItemLookupRequest>
                </Request>
                <Item>
                        <ASIN>0201788977</ASIN>                             
                        <ItemAttributes>
                                <Author>Hesham Soliman</Author>
                                <ProductGroup>Book</ProductGroup>
                                <Title>Mobile IPv6 : Mobility in a Wireless 
Internet</Title>
                        </ItemAttributes>
                </Item>
        </Items>
</ItemLookupResponse>

The code looks like this:

        $xml = simplexml_load_file('test.xml');
        $result = $xml->xpath($query);
        var_dump($result);

When:
        $query = '//*';

Everything is fine and an enormous array of matching elements is returned. 
However, when:

        $query = '//ItemLookupResponse';

var_dump returns:

        array(0) {
        }

Either a) I'm doing something terribly wrong (and I thought that I was 
attempting a pretty
simple xpath query) or b) SimpleXML's broken.

I'd prefer a) - it's easier to fix :)

Thanks a bunch,

Simon Turvey

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