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The current implementation does require We could change it to infer it as suggested. However, maybe we want to consider taking into account some discussions we had during the MEC in Paderborn. One idea is to have This was dicussed for @martha-thomae do you think we should change Verovio behaviour and infer the values? We would still have the option to give it explicitly if the desired value is diverging from the inferred one. |
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I don't see a problem with inferring the "logical" domain attributes from the sign for this particular sign (Cut-C), but maybe it won't be a good idea for others(?) Let me finish reading the discussion and comment on that. |
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Here are the defaults that should be used for the standard mensuration signs: 
Taken from Plain and easy introduction to practical music by Thomas Morley: The first four mensuration signs (at the bottom of the table) explicitly describe the Here is the same chart highlighting the explicit and implicit values for the signs: 
For the first four mensuration signs, the The first four mensuration signs can have alternate meaning from the standard mensuration signs. In particular here is the standard meaning of 
This is also indicated most commonly with the mensuration sign "3" where the main part of the sign (C or Cut-C) is implied from the prevailing mensuration. In this case the sesquialtera causes the tempus level to become perfected, but there is also a 3:2 proportion added to the durations on that level, such that 3 semibreves (whole notes) in sesquialtera take the same time as 2 non-sesquialtera semibreves. Minor sesquialtera is also possible (also indicated by 
It would be useful for @annplaksin to give the sesquialtera encodings of Also I am wondering how Cut-C sesquialtera will be encoded (Cut-C has an implied proportion of 2:1 due to the slash for all rhythmic levels, and 3:2 proportion for only the tempor or prolatio rhythmic level): 
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That looks good and seems to be an excellent basis for the documentation. What would be useful to have is some test cases for the eight signs. They could be added to https://github.com/rism-digital/verovio.org/tree/gh-pages/_tests/mensural (or Once we have the examples from @annplaksin I can look at the implementation of these. |
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Yes, I don't see anything wrong with this idea. We can encode the sign and then let Verovio infer these mensuration values (for We would only need to inform the other members of the IG as that is not the way things have been working so far, but I think it is a good solution. What do you think, @annplaksin? Things wouldn't change that much and we can add this to the documentation once we decide this would be the way to go for Verovio. |
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Sorry for arriving late to the party, and being confused as well... |
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I added eight examples corresponding to the cases given by Morley https://www.verovio.org/test-suite.xhtml?cat=mensur All mensur signs are coded explicitly, with |
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In this example:
Click to view MEI data for above example
The semibreve (whole note) rest at the start of the bottom staff is being implicitly assigned
@dur.quality="perfecta"when it should be@dur.quality="imperfecta"due to the Cut-C (or C) mensuration sign. Adding@dur.quality="imperfecta"to the semibreve rest causes its duration to be correct:Click to view MEI data for above example
However, in the following test, all notes are being treated correctly as imperfecta:
Click to view MEI data for above example
So I am confused as to why in the first example the semibreve rest is being treated as
perfecta. (I tried converting to a note and it was stillperfecta).Preferably the Cut-C mensuration sign would implicitly set the tempus and prolatio level divisions to imperfect.
This can be explicitly set in the
<mensur>by adding@prolatio="2"for the semibreve->minim level divisions, and@tempus="2"for the breve->semibreve level divisions:Click to view MEI data for above example
But preferably
would be treated implicitly as (all rhythmic levels imperfect even at higher levels of the modus and maximodus):
But at least for the first example above this is not happening, while the third example seems to do this.
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