How to use SDF with ROS packages in gazebo?

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Using ROS Indigo and Gazebo 2.2 on Ubuntu 14.04

I have created a model for a robot that is similar to Clearpath's Jackal. What I am trying to do is have the already-created Jackal packages apply to my robot model. In other words, I am trying to substitute the model of Clearpath's Jackal with my robot model so that Clearpath's Jackal packages can apply to my model.

The robot I made is in SDF while the packages for Clearpath's jackal reference and use URDF/XACRO. Does anyone know if it is possible to implement the SDF files and/or remove the URDF/XACRO files from the packages so that the Clearpath's Jackal's packages would apply to my model? If it is possible, what would be the best implementation process?

Thanks!

Pooja