XPath query works with CLOB but not with object relational

Question

hi all
i have the following queries,the XQuery work with all, but XPath queries work with XMLType CLOB and Binary XML, but they do not work with XMLType as Object relational,
select extract (object_value,'movies/directorfilms/films/film [studios/studio = "Gaumont"]')
from xorm;
select extract (object_value,'movies/directorfilms[director/dirname = "L.Cohen"]/films/film[position()=2]/t')
from xorm;
they shows this message
ORA-00932: inconsistent datatypes: expectd SYSTEM.name683_COLL got CHAR
thanks

Answer 1

Hi Marco
fisrt here is my RO
BEGIN
DBMS_XMLSCHEMA.registerSchema(
SCHEMAURL=>'http://......../ORMovies.xsd',
SCHEMADOC=>bfilename('DB','Movies.xsd'),
LOCAL =>false,
GENTYPES=>true,
GENTABLES=>FALSE,
CSID=>nls_charset_id('AL32UTF8'));
END;
create table XORM of xmltype
xmltype store as object relational
XMLSCHEMA "http://......../ORMovies.xsd"
ELEMENT "movies";
INSERT INTO XORM
VALUES(XMLType(BFILENAME('DB','ORMovies.xml'),nls_charset_id('AL32UTF8')));
here the XQuery format that work fine with the OR
A/D
select XMLQuery ('for $a in movies/directorfilms/films/film
          where $a/studios/studio = "Gaumont"
          return $a'
     passing object_value
     returning CONTENT)"TitleX"
from xorm;
child element query
select XMLQuery ('for $a in movies/directorfilms/director[dirname = "Feyder"]
          let $b:=$a/../films/film[position()=2]
          return $b/t'
     passing object_value
     returning CONTENT)"TitleX"
from xorm;
here is the XPath format which doesn't work
select extract (object_value,'movies/directorfilms/films/film [studios/studio = "Gaumont"]')
from xorm;
select extract (object_value,'movies/directorfilms[director/dirname = "Feyder"]/films/film[position()=2]/t')
from xorm;
by the way all queries work fine with the CLOB or Binary XML
many thanx Marco