an Entity references as follows:
MULTEXT-East feature Number="count" (Nouns in Serbian, Macedonian, Bulgarian), e.g., Bulgarian яка/як, язовира/язовир, яда/яд, юргана/юрган, юбилея/юбилей, ъгъла/ъгъл (http://purl.org/olia/mte/multext-east.owl#CountNumber)