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1.3.0 - Performance of SDF File Structure - Redundancy in Reloading Description Files For Every SDF Read?

I recently checked out the source code of Gazebo 1.3.0 (02a2ec16375a+ (gazebo_1.3) gazebo_1.3.0) and was looking into how the XML and SDF system works. I noticed that for each SDF file is loaded (from gazebo/, Server::LoadFile(), then from gazebo/sdf/interface/, readXml()), it makes multiple calls to sdf::init(). When debugging, it would load the same SDF description files (in gazebo/sdf/1.3) several times.

This seems like it might be redundant and inefficient. Are there plans to cache these loaded XML documents, or are there reasons why they are reloaded every time?