{"action":"opened","issue":{"url":"https://api.github.com/repos/Materials-Consortia/optimade-python-tools/issues/82","repository_url":"https://api.github.com/repos/Materials-Consortia/optimade-python-tools","labels_url":"https://api.github.com/repos/Materials-Consortia/optimade-python-tools/issues/82/labels{/name}","comments_url":"https://api.github.com/repos/Materials-Consortia/optimade-python-tools/issues/82/comments","events_url":"https://api.github.com/repos/Materials-Consortia/optimade-python-tools/issues/82/events","html_url":"https://github.com/Materials-Consortia/optimade-python-tools/issues/82","id":522942998,"node_id":"MDU6SXNzdWU1MjI5NDI5OTg=","number":82,"title":"Support of RHS expressions","user":{"login":"fekad","id":6748541,"node_id":"MDQ6VXNlcjY3NDg1NDE=","avatar_url":"https://avatars1.githubusercontent.com/u/6748541?v=4","gravatar_id":"","url":"https://api.github.com/users/fekad","html_url":"https://github.com/fekad","followers_url":"https://api.github.com/users/fekad/followers","following_url":"https://api.github.com/users/fekad/following{/other_user}","gists_url":"https://api.github.com/users/fekad/gists{/gist_id}","starred_url":"https://api.github.com/users/fekad/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fekad/subscriptions","organizations_url":"https://api.github.com/users/fekad/orgs","repos_url":"https://api.github.com/users/fekad/repos","events_url":"https://api.github.com/users/fekad/events{/privacy}","received_events_url":"https://api.github.com/users/fekad/received_events","type":"User","site_admin":false},"labels":[{"id":955704205,"node_id":"MDU6TGFiZWw5NTU3MDQyMDU=","url":"https://api.github.com/repos/Materials-Consortia/optimade-python-tools/labels/enhancement","name":"enhancement","color":"a2eeef","default":true}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2019-11-14T15:46:15Z","updated_at":"2019-11-14T15:46:15Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"RHS expressions are optional due to the specification by they could be practical. The grammar is already implemented in the version v10.0.x but the implementation of the `Transformer` may need further testing. Especially if we want to support the following [optional rule's](https://github.com/Materials-Consortia/OPTiMaDe/blob/master/optimade.md#numeric-and-string-comparisons) as well which is not obvious for me who should be implemented:\r\n  ```\r\n  identifier <operator> identifier\r\n  constant <operator> constant\r\n  ```\r\nI think if we want a more elegant implementation we might have to change the grammar as well."}}
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