{"action":"closed","issue":{"url":"https://api.github.com/repos/xproc/3.0-specification/issues/306","repository_url":"https://api.github.com/repos/xproc/3.0-specification","labels_url":"https://api.github.com/repos/xproc/3.0-specification/issues/306/labels{/name}","comments_url":"https://api.github.com/repos/xproc/3.0-specification/issues/306/comments","events_url":"https://api.github.com/repos/xproc/3.0-specification/issues/306/events","html_url":"https://github.com/xproc/3.0-specification/issues/306","id":298616301,"number":306,"title":"Clarify semantics of p:try (without p:catch)","user":{"login":"xml-project","id":8513917,"avatar_url":"https://avatars0.githubusercontent.com/u/8513917?v=4","gravatar_id":"","url":"https://api.github.com/users/xml-project","html_url":"https://github.com/xml-project","followers_url":"https://api.github.com/users/xml-project/followers","following_url":"https://api.github.com/users/xml-project/following{/other_user}","gists_url":"https://api.github.com/users/xml-project/gists{/gist_id}","starred_url":"https://api.github.com/users/xml-project/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/xml-project/subscriptions","organizations_url":"https://api.github.com/users/xml-project/orgs","repos_url":"https://api.github.com/users/xml-project/repos","events_url":"https://api.github.com/users/xml-project/events{/privacy}","received_events_url":"https://api.github.com/users/xml-project/received_events","type":"User","site_admin":false},"labels":[{"id":578209896,"url":"https://api.github.com/repos/xproc/3.0-specification/labels/core-spec","name":"core-spec","color":"f9d0c4","default":false},{"id":569375668,"url":"https://api.github.com/repos/xproc/3.0-specification/labels/proposed%20resolution","name":"proposed resolution","color":"c2e0c6","default":false}],"state":"closed","locked":false,"assignee":{"login":"ndw","id":36793,"avatar_url":"https://avatars2.githubusercontent.com/u/36793?v=4","gravatar_id":"","url":"https://api.github.com/users/ndw","html_url":"https://github.com/ndw","followers_url":"https://api.github.com/users/ndw/followers","following_url":"https://api.github.com/users/ndw/following{/other_user}","gists_url":"https://api.github.com/users/ndw/gists{/gist_id}","starred_url":"https://api.github.com/users/ndw/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ndw/subscriptions","organizations_url":"https://api.github.com/users/ndw/orgs","repos_url":"https://api.github.com/users/ndw/repos","events_url":"https://api.github.com/users/ndw/events{/privacy}","received_events_url":"https://api.github.com/users/ndw/received_events","type":"User","site_admin":false},"assignees":[{"login":"ndw","id":36793,"avatar_url":"https://avatars2.githubusercontent.com/u/36793?v=4","gravatar_id":"","url":"https://api.github.com/users/ndw","html_url":"https://github.com/ndw","followers_url":"https://api.github.com/users/ndw/followers","following_url":"https://api.github.com/users/ndw/following{/other_user}","gists_url":"https://api.github.com/users/ndw/gists{/gist_id}","starred_url":"https://api.github.com/users/ndw/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ndw/subscriptions","organizations_url":"https://api.github.com/users/ndw/orgs","repos_url":"https://api.github.com/users/ndw/repos","events_url":"https://api.github.com/users/ndw/events{/privacy}","received_events_url":"https://api.github.com/users/ndw/received_events","type":"User","site_admin":false}],"milestone":null,"comments":8,"created_at":"2018-02-20T14:35:59Z","updated_at":"2018-03-17T23:34:36Z","closed_at":"2018-03-17T23:34:36Z","author_association":"CONTRIBUTOR","body":"After reading the specs on p:try again I think we need to clarify the semantics of a p:try which has no p:catch but a p:finally. \r\nTwo interpretations of behaviour in an error case:\r\n(1) Since no p:catch is specified here but there is a p:try, the error is discarded and p:finally is executed. The output port of p:try are the output ports of the p:group (or of the subpipeline since p:group is not required anymore), but all output ports are empty.\r\n(2) Since no p:catch is stated here, the error has to bubble up to an outer p:catch or the processor. But since there is a p:finally, this subpipeline is executed before the error bubbles up.\r\n\r\nI am in favour of interpretation (2) which would be _my_ natural reading of the pipeline, but I am certainly open to arguments.\r\n\r\nHowever we decide: Since we made p:catch optional we need to explain, what p:try-p:finally means.\r\nAny thoughts?"}}
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