Load a single conformation from an XML file, such as those produced by OpenMM
Note: The OpenMM serialized state XML format contains information that is not read by this method, including forces, energies, and velocities. Here, we just read the positions and the box vectors.
| Parameters: | filename : string 
 top : {str, Trajectory, Topology} 
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|---|---|
| Returns: | trajectory : md.Trajectory 
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