Gets a topology version.
(tpm_infoversion tpm_id)
Returns a topology version (string) or nil.
| tpm_id | Topology ID (real) |
A topology's version is the Data Extension version (ADE) in which the topology was created. For example, "2.026". This function gets the same result as tpm_iterversion. The difference is that tpm_infoversion requires a topology ID, and it works only on topologies that are open.