Leaders missing for TED, TEC and LEC

[xhero]

These three templates are just ignored in the code, a proposition for a proper leader should be made

[xhero]

A proposed list (from me):

edition: cc
composite: pc
source: dm or dd if child
edition_content: cd (cm will never happen!)
libretto_source: tm
libretto_edition:ac
theoretica_source: pm

we miss

libretto_edition_content: ad
theoretica_edition_content: pd

and we need to fix:

libretto_edition: ac if collection, am if single
theoretica_edition: pc if collection, pm if single

Note that Muscat has a bug for edition and libretto edition: instead of properly setting those as collection/single item it counts 773 (!) in the childs (!!) for the child leader. This has to be moved to to the toplevel editions, see if 774s exists, and adapt the leader of those as per table.

EDIT: proposal from JW: https://docs.google.com/document/d/1boHNy1O4yhRMaQNJW6H0etRnuPideC1QaieQKFZwRL0/edit

[jenniferward]

I agree with the above regarding what is missing and what needs to be fixed (highlighted in yellow in the document). I would add that EDT should also differentiate between collection and single.

I went a bit further in the document, after having looked at the MARC description in more detail and comparing that with our templates. In case we want to look at it further.

[lpugin]

Looks good to me