XML : Oracle: read XML using XMLTable

I'd like to read a XML using XMLTABLE but I would like my PATH be a varchar2 instead of a string. I'm trying to do it but I'm getting the error "ORA-01780: string literal required"

Example:

  path1 VARCHAR2(100);  path2 VARCHAR2(100);  path3 VARCHAR2(100);  path4 VARCHAR2(100);    begin    path1 :='persons/employees/emp';  path2 :='persons/employees/name';  path3 :='persons/employees/job';  path4 :='persons/employees/hire';    SELECT xt.*  FROM   xml_tab x,         XMLTABLE('/company/person'           PASSING x.xml_data           COLUMNS              "EMPNO"    VARCHAR2(4)  PATH path1,             "ENAME"    VARCHAR2(10) PATH path2,             "JOB"      VARCHAR2(9)  PATH path3,             "HIREDATE" VARCHAR2(11) PATH path4           ) xt;    

Does anyone knows if there is any way to use a varchar2 variable type after PATH instaead of writing the path directly?