Extract Namespace using Extract variable policy

Google Cloud Apigee
1

Hi All,

I need to extract namespace from a node to perform further operations. My XML is something like shown below.

<SOAP-ENV:Envelope 
     xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" 
     xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
  <SOAP-ENV:Header>...</SOAP-ENV:Header>
  <SOAP-ENV:Body>
    <CreateAndSendEnvelope xmlns="http://www.docusign.net/API/3.0">....</CreateAndSendEnvelope>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

I need to extract namespace of CreateAndSendEnvelope node.

I used extract variable policy as shown below.

  <XMLPayload>
      <Namespaces>
         <Namespace prefix="dir">http://schemas.xmlsoap.org/soap/envelope</Namespace>
      </Namespaces>
      <Variable name="operationname" type="string">
         <XPath>/dir:Envelope/dir:Body/CreateAndSendEnvelope/@xmlns</XPath>
      </Variable>
  </XMLPayload>

Any help would be appreciated,

Thankyou

1 Like
2

Hi,

Can u try with this line:

<Namespaces>
            <Namespace prefix="soapenv">http://schemas.xmlsoap.org/soap/encoding/</Namespace>
</Namespaces>
<Variable name="CreateAndSendEnvelope" type="string">
            <XPath>/soapenv:Envelope/soapenv:Header/soapenv:Header:Body/CreateAndSendEnvelope</XPath>
 </Variable>
3

No, thatā€™s not it.

4

hi, I can guess what the problem is, but YOU DIDNā€™T SAY IT.

You said ā€œI need to extract namespace of CreateAndSendEnvelope node.ā€

and ā€œthis is the policy I usedā€

andā€¦

WHAT HAPPENED? What results did you see?

You didnā€™t say.

I will have to guess. I guess that you didnā€™t get the data extracted as you expected. Is that right?

5

Namespaces in XML are very specific. The namespace often looks like a web URI, and we may assume that

http://foo/bar/

is equivalent to

http://foo/bar (no trailing slash)

But that is not the case, when dealing with XML namespaces.

Specific to your case, you have

<Namespaces>
  <Namespace prefix="dir">http://schemas.xmlsoap.org/soap/envelope</Namespace>
</Namespaces>

And thatā€™s not good. The namespace you want ends with a slash.

Add the trailing slash:

<Namespaces>
  <Namespace prefix="dir">http://schemas.xmlsoap.org/soap/envelope/</Namespace>
</Namespaces>

But, two additional things.

  1. if I were doing this I would not use ā€œdirā€ as a prefix. Itā€™s true that the prefix is not semantically important. Itā€™s just a variable name. But as with regular programming code, there are good and bad variable names. When an xml namespace refers to the soap encoding namespace, the prefix used is often ā€œsoapā€. Or at the very least, ā€˜sā€™. That tells people what you intend.
  2. You canā€™t get the xmlns via an attribute. you need to use the namespace-uri function

The result of these three changes like this:

  <XMLPayload>
    <Namespaces>
      <!-- note the trailing slash here -->
      <Namespace prefix="s">http://schemas.xmlsoap.org/soap/envelope/</Namespace>
    </Namespaces>
    <Variable name="operationname" type="string">
       <XPath>local-name(/s:Envelope/s:Body/*)</XPath>
    </Variable>
    <Variable name="xmlns" type="string">
       <XPath>namespace-uri(/s:Envelope/s:Body/*)</XPath>
    </Variable>

  </XMLPayload>
1 Like
6

Hi,

yes, I am unable to extract the value. operationname variable is Null

7

Thank you it worked !!!