{"action":"opened","issue":{"url":"https://api.github.com/repos/choderalab/protons/issues/95","repository_url":"https://api.github.com/repos/choderalab/protons","labels_url":"https://api.github.com/repos/choderalab/protons/issues/95/labels{/name}","comments_url":"https://api.github.com/repos/choderalab/protons/issues/95/comments","events_url":"https://api.github.com/repos/choderalab/protons/issues/95/events","html_url":"https://github.com/choderalab/protons/issues/95","id":237273936,"number":95,"title":"Don't need to pass ffxml file to constructor","user":{"login":"jchodera","id":3656088,"avatar_url":"https://avatars2.githubusercontent.com/u/3656088?v=3","gravatar_id":"","url":"https://api.github.com/users/jchodera","html_url":"https://github.com/jchodera","followers_url":"https://api.github.com/users/jchodera/followers","following_url":"https://api.github.com/users/jchodera/following{/other_user}","gists_url":"https://api.github.com/users/jchodera/gists{/gist_id}","starred_url":"https://api.github.com/users/jchodera/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jchodera/subscriptions","organizations_url":"https://api.github.com/users/jchodera/orgs","repos_url":"https://api.github.com/users/jchodera/repos","events_url":"https://api.github.com/users/jchodera/events{/privacy}","received_events_url":"https://api.github.com/users/jchodera/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-06-20T16:38:50Z","updated_at":"2017-06-20T16:38:50Z","closed_at":null,"body":"It looks like the [`ForceField`](https://github.com/pandegroup/openmm/blob/master/wrappers/python/simtk/openmm/app/forcefield.py) object doesn't cache the XML files, so we will need to either request that this be added to OpenMM or you would need to add to the register a [`parser`](https://github.com/pandegroup/openmm/blob/master/wrappers/python/simtk/openmm/app/forcefield.py#L152)."}}
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