/db/projects/hirt/web/briefe/detail.xqlexerr:ERROR XPTY0004: The actual cardinality for parameter 1 does not match the cardinality declared in the function's signature: normalize-space($arg as xs:string?) xs:string. Expected cardinality: zero or one, got 2. [at line 49, column 42, source: /db/projects/hirt/web/briefe/detail.xql]