Given an InChI how to get its 3D co-ordinates

Recently, as part of the oreChem project that I am working for, I had to fetch 3D structure in CML format, given an InChI. Some of the InChI's I had were present in PubChem and some of them were not present in PubChem.
For those InChI's present in PubChem:
Its difficult to fetch the 3D structure given an InChI by doing a String search on the PubChem database.I found it time consuming even if there is an md5 Index on it. Easy way I figured out is to fetch the CID of that particular InChI, use that CID and then fetch the 3D structure.
Using eutils REST services appending the InChI in the the url here I got the CID of a given InChI. By Parsing the xml output and extracting the CID and using the following url here I got the 3D structure in XML format.
Another way is to convert InChI into SMILES using InChItoSMILES converter and then use smi23d to get 3D structure in SDF format, then convert SDF format into XML/CML using OpenEyeBabel or any other tool. (in Open Babel simply do "babel source.sdf result.cml")

For those not present in PubChem:
For these InChI's one could use OpenEyeBabel or OpenEyeChem 3D structure generating programs. I had posted this question on Blue Obelisk Stack exchange, a question and answer website for Cheminformaticians(similar to StackOverflow,SemanticOverflow). Here is the answer on how to do it. The 3D co-ordinated generated by OpenBabel and OpenEyeChem were not the same, they will not be same. Look here for the reasons.

If you need to Install Openbabel look here.