How to interpret UniProt allele patterns?

In creating a parser for the UniProt flat file uniprot_sprot.dat (directory) in the manual for the comments POLYMORPHISM there are listed patterns for alleles, e.g. for 1A11_HUMAN is

The following alleles of A-11 are known:
A*11:01 (A-11E), A*11:02 (A-11K), A*11:03, A*11:04, A*11:05 and A*11:07.

I tried searching for a description of the patterns using the words allele and/or polymorphism and found nothing.

• How are the allele patterns to be interpreted?
• Is there a search term to be used when looking for the patterns?
• Also, is there an official repository of the alleles?

The answer does not have to explain the specifics of the example given.

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Example of explanation of other allele pattern from here

This explanation of the patterns doesn’t explain the part of the pattern in UniProt like (A-11E).