什么是正确的XML xpath？

Here's the XML document.

这是XML文档。

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="https://schemas.xmlsoap.org/soap/envelope/" xmlns:mtc="OTC_Matching_11-0" xmlns:rm="OTC_RM_11-0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="OTC_RM_11-0 /xmls/OTC/OTC_RM_11-0.xsd  OTC_Matching_11-0  /xmls/OTC/OTC_Matching_11-0.xsd                           https://schemas.xmlsoap.org/soap/envelope/ /xmls/OTC/soap-envelope.xsd  ">
<env:Header>
  <OTC_RM xmlns="OTC_RM_11-0">
     <Manifest>
        <TradeMsg>
           <Activity>New</Activity>
           <Status>Submit</Status>
        </TradeMsg>
     </Manifest>
  </OTC_RM>
</env:Header>
</env:Envelope>
<?xml ver