Ok, so I do not understand what the default namespace is if I have:

<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:o="urn:schemas-microsoft-com:office:office"
 xmlns:x="urn:schemas-microsoft-com:office:excel"
 xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:html="http://www.w3.org/TR/REC-html40">

....

And then, the next element under this is:
<DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">

So is my xpath:

select="/Workbook/DocmentProperties"

Or:

select="/xmlns:Workbook/xmlns:DocmentProperties"

Thanks.