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Returns a literal of the same kind (simple literal, plain literal same language tag, xsd:string) as the first argument arg1. The lexical form of the result is the substring of the value of arg1 that precedes in arg1 the first occurrence of the lexical form of arg2; otherwise the lexical form of the result is the empty string. If the lexical form of arg2 is the empty string, the lexical form of the result is the emprty string.

STRBEFORE