SOAPEnvAttachment is available since version 1.0.
Prototype:
number SOAPEnvAttachment(number soap_env, string name, string href)
Parameters
name
[in] name of the XML node
Description:
Add attachment href node to the envelope current parent.
Return value:
Returns null if failed, or an XML node handle. (Check { SOAPXMLGetNodeArray} to get the node contents).