The dbxmlExistsContainer
accessor tests for the existance of an XML container in Berkeley DBXML.
The container specification to be queried is provided as the operator argument and is
an XML fragment.
If successful the response is a boolean true otherwise a boolean false.
Operator Format
The format for the operator is...
<dbxml>
<name>mycontainer</name>
</dbxml>
The name tag is required and specifies the identity of the container in the BDBXML database.
Reference