{"action":"created","issue":{"url":"https://api.github.com/repos/music-encoding/music-encoding/issues/227","labels_url":"https://api.github.com/repos/music-encoding/music-encoding/issues/227/labels{/name}","comments_url":"https://api.github.com/repos/music-encoding/music-encoding/issues/227/comments","events_url":"https://api.github.com/repos/music-encoding/music-encoding/issues/227/events","html_url":"https://github.com/music-encoding/music-encoding/issues/227","id":82063101,"number":227,"title":"<instrumentation> and subelements should allow att.edit","user":{"login":"ahankinson","id":163183,"avatar_url":"https://avatars.githubusercontent.com/u/163183?v=3","gravatar_id":"","url":"https://api.github.com/users/ahankinson","html_url":"https://github.com/ahankinson","followers_url":"https://api.github.com/users/ahankinson/followers","following_url":"https://api.github.com/users/ahankinson/following{/other_user}","gists_url":"https://api.github.com/users/ahankinson/gists{/gist_id}","starred_url":"https://api.github.com/users/ahankinson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ahankinson/subscriptions","organizations_url":"https://api.github.com/users/ahankinson/orgs","repos_url":"https://api.github.com/users/ahankinson/repos","events_url":"https://api.github.com/users/ahankinson/events{/privacy}","received_events_url":"https://api.github.com/users/ahankinson/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/music-encoding/music-encoding/labels/enhancement","name":"enhancement","color":"84b6eb"},{"url":"https://api.github.com/repos/music-encoding/music-encoding/labels/imported","name":"imported","color":"FFFFFF"},{"url":"https://api.github.com/repos/music-encoding/music-encoding/labels/Priority-Medium","name":"Priority-Medium","color":"FFFFFF"}],"state":"open","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/music-encoding/music-encoding/milestones/4","html_url":"https://github.com/music-encoding/music-encoding/milestones/backlog","labels_url":"https://api.github.com/repos/music-encoding/music-encoding/milestones/4/labels","id":1138308,"number":4,"title":"backlog","description":null,"creator":{"login":"ahankinson","id":163183,"avatar_url":"https://avatars.githubusercontent.com/u/163183?v=3","gravatar_id":"","url":"https://api.github.com/users/ahankinson","html_url":"https://github.com/ahankinson","followers_url":"https://api.github.com/users/ahankinson/followers","following_url":"https://api.github.com/users/ahankinson/following{/other_user}","gists_url":"https://api.github.com/users/ahankinson/gists{/gist_id}","starred_url":"https://api.github.com/users/ahankinson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ahankinson/subscriptions","organizations_url":"https://api.github.com/users/ahankinson/orgs","repos_url":"https://api.github.com/users/ahankinson/repos","events_url":"https://api.github.com/users/ahankinson/events{/privacy}","received_events_url":"https://api.github.com/users/ahankinson/received_events","type":"User","site_admin":false},"open_issues":11,"closed_issues":28,"state":"open","created_at":"2015-05-28T15:32:17Z","updated_at":"2015-05-28T18:16:35Z","due_on":null,"closed_at":null},"comments":4,"created_at":"2015-05-28T18:16:35Z","updated_at":"2015-05-28T18:16:51Z","closed_at":null,"body":"_From [klaus.re...@gmail.com](https://code.google.com/u/105834722588578911678/) on January 29, 2015 08:11:10_\n\nAt some point it may not be possible to identify the original instrumation of a work (completely). So it should be possible to mark the coding with @-cert.\n\n_Original issue: http://code.google.com/p/music-encoding/issues/detail?id=227_"},"comment":{"url":"https://api.github.com/repos/music-encoding/music-encoding/issues/comments/106545548","html_url":"https://github.com/music-encoding/music-encoding/issues/227#issuecomment-106545548","issue_url":"https://api.github.com/repos/music-encoding/music-encoding/issues/227","id":106545548,"user":{"login":"ahankinson","id":163183,"avatar_url":"https://avatars.githubusercontent.com/u/163183?v=3","gravatar_id":"","url":"https://api.github.com/users/ahankinson","html_url":"https://github.com/ahankinson","followers_url":"https://api.github.com/users/ahankinson/followers","following_url":"https://api.github.com/users/ahankinson/following{/other_user}","gists_url":"https://api.github.com/users/ahankinson/gists{/gist_id}","starred_url":"https://api.github.com/users/ahankinson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ahankinson/subscriptions","organizations_url":"https://api.github.com/users/ahankinson/orgs","repos_url":"https://api.github.com/users/ahankinson/repos","events_url":"https://api.github.com/users/ahankinson/events{/privacy}","received_events_url":"https://api.github.com/users/ahankinson/received_events","type":"User","site_admin":false},"created_at":"2015-05-28T18:16:51Z","updated_at":"2015-05-28T18:16:51Z","body":"_From [a...@kb.dk](https://code.google.com/u/101822190470135414035/) on February 03, 2015 03:40:06_\n\nIf I understand this right there are two scenarios discussed here: One where the intended instrumentation of the work is uncertain because of lack of information and one where different instrumentations are used in the sources (of course, a missing part in a set of parts is not a different instrumentation; it is just an incomplete source - that's another thing).\r\nIn general, I try to avoid using @cert because I don't find the possible values - low, high, medium, unknown - very informative. Except for \"unknown\" they signify a judgement but give no information on the evidence they are based on. Combining it with @evidence helps in some cases. For the instrumentation of a lost or incompletely preserved work, @-cert=\"unknown\" may be useful, though, such as in Klaus' first example. \r\nThe other example given is a different: It lists an instrumentation as assumed by the editor, if I understand you correctly. In this case I would find it more useful to indicate that the assumed instrumentation was added by the editor. \r\nWhy not allow \\<add> in \\<perfMedium> and its descendants? In that case, you could use:\r\n\r\n\\<instrumentation>\r\n  \\<instrVoiceGrp xml:id=\"InstrGrp\">\r\n    \\<head>Orchestra</head>\r\n    \\<add evidence=\"conjecture\"><instrVoice count=\"2\">Corno</instrVoice></add>\r\n    \\<instrVoice count=\"2\">Oboi</instrVoice>\r\n    \\<instrVoice count=\"2\">Violino</instrVoice>\r\n    \\<add evidence=\"conjecture\"><instrVoice count=\"1\">Viola</instrVoice></add>\r\n    \\<instrVoice count=\"1\">Basso continuo</instrVoice>\r\n  \\</instrVoiceGrp>\r\n  [...]\r\n\\</instrumentation>\r\n\r\nI am not sure whether the use of perfMedium in \\<source> or \\<item> would actually subvert the FRBR module. Conflicting instrumentations across FRBR levels are unavoidable: I believe that it does make sense to say that the instrumentation \r\nof a particular symphony is a large orchestra even when some of its sources present a different one - for instance, a piano score. Otherwise it would be impossible to indicate a work's instrumentation at all, but only instrumentations at source or item level. Or: every variation in instrumentation would have to constitue a new work. That's probably not what everyone wants either.\r\n\r\nA third situation is where a score contains staves without indication of instrument. With \\<add> allowed within \\<instrVoice>, you could do this:\r\n\r\n\\<instrVoice count=\"2\">\r\n  \\<add evidence=\"conjecture\">Oboi</add>\r\n\\</instrVoice>"}}