/db/apps/mop/register/personen/detail.xqlexerr:ERROR XPTY0004: The actual cardinality for parameter 1 does not match the cardinality declared in the function's signature: substring-after($source as xs:string?, $search as xs:string?) xs:string. Expected cardinality: zero or one, got 3. [at line 114, column 53, source: /db/apps/mop/register/personen/detail.xql]