The other question that comes to mind is how to update and existing file or creates a new file in MDS. It's really simple.
We already have setup done for this in Foundation Pack.
Here are the steps you need to do to update or create a new file in MDS
1) Browse to AIA_HOME/AIAMetaData
2) Place your file(it may be new file or modified existing file) at the desired location. The same hierarchy will appear in MDS starting from AIAMetaData.
3) Edit UpdateMetaDataDeploymentPlan.xml in aia_instances/AIA_INSTANCE_NAME/config.
4) In the tag, mention the files which you have modified or added new. You can add a file or directory as required.
5) Browse to AIA_HOME/Infrastructure/Install/scripts
6) Run ant -f UpdateMetaData.xml

Here is the same UpdateMetaData Deployment Plan.

UpdateMetaDataDP.xml

There are some things that you may want to take care while updating MDS
1) The path in "fileset" tag can be anywhere on the disk.
2) The path in "include" tag has to be relative to what is given in "fileset" tag
3) The path is MDS will appear what you have given in "include" tag. The path in this tag will automatically appended to /apps/AIAMetaData/.