KnowledgeIdentifierFormat

A format (1.54.0): {d} a digit, {a} a letter, {x} either, {d4} four, {d8-17} eight to seventeen (1 to 32); any other character a literal letter or digit (any case), space, -, ., /, : or #. 1 to 8 placeholders, at most one range (identifierPatternIssues).

A value of type string.