PHP XML Attributes

I'm having trouble reading attributes from the Spreadshirt API with SimpleXML. I can't grab the xlink:href attribute from resources, which is what I need as it's not displays in the data received. Seem to be able to grab everything else, though.

This is the XML I'm reading in:

 <articles xmlns:xlink="http://ift.tt/PGV9lw" xmlns="http://ift.tt/1wcwkCJ" xlink:href="http://ift.tt/1wcwj1G" offset="0" limit="50" count="16" sortField="default" sortOrder="default">
    <article isDuplicate="false" xlink:href="http://ift.tt/1wcwj1I" id="100402428">
      <name>Hammer T-Shirt</name>
      <price>
        <vatExcluded>13.33</vatExcluded>
        <vatIncluded>16.00</vatIncluded>
        <vat>20.00</vat>
        <currency xlink:href="http://ift.tt/1G07aqg" id="2"/>
      </price>
      <resources>
        <resource mediaType="png" type="preview" xlink:href="http://ift.tt/1wcwjhY"/>
      </resources>
    </article>
 </atricles>

This is the data coming back from SimpleXML:

SimpleXMLElement Object
(
[@attributes] => Array
    (
        [isDuplicate] => false
        [id] => 27368595
    )

[name] => Hammer Boxers
[price] => SimpleXMLElement Object
    (
        [vatExcluded] => 10.00
        [vatIncluded] => 12.00
        [vat] => 20.00
        [currency] => SimpleXMLElement Object
            (
                [@attributes] => Array
                    (
                        [id] => 2
                    )

            )

    )

[resources] => SimpleXMLElement Object
    (
        [resource] => SimpleXMLElement Object
            (
                [@attributes] => Array
                    (
                        [mediaType] => png
                        [type] => preview
                    )

            )

    )

)

Does anyone have any ideas? I'm stumped.