Group names given in the MODS-file according to given roles to reduce number of columns

[joergleh]

Aim: Reduce number of columns for better manageability of data frame
Proposal: Group names given in the MODS-file according to given roles
Explanation: Each "name" entry in the mods-file consists of at least four parts:
"nameXX_namePart.family"
"nameXX_namePart.given"
"nameXX_displayForm"
"nameXX_role_roleTerm"
The number of columns could significantly be reduced if the names would first be grouped according to the roles and then concatenated into a fewer number of columns.
Examples:
PPN735425078 contains 76 names with the role "asn" (= associated name); this amounts up to 304 columns, but could be reduced to three columns ("nameASN_namePart.family", "nameASN_namePart.given", "nameASN_displayForm"), each containing 76 names in nested form (Mauschwitz; Baudis; Hoberg; ...)
PPN858144891 contains 50 names with the role "oth" (= other); this amounts up to 200 columns, but could be reduced to three columns ("nameOTH_namePart.family", "nameOTH_namePart.given", "nameOTH_displayForm")
PPN1774254956 contains 42 names with the role "ctb" (= contributor); this amounts up to 168 columns, but could be reduced to three columns ("nameCTB_namePart.family", "nameCTB_namePart.given", "nameCTB_displayForm")
The most frequently used roles are asn (associated name), oth (other), ctb (contributor), dte (dedicatee), fnd (funder), auth (author), isb (issuing body), egr (engraver), hnr (honoree), ill (illustrator), prt (printer).

[mikegerber]

Duplicate of #20.