Call Function from PLSQL--ORA-31013 : Invalid XPATH expressioon

Question

I tried the following SQL statement. when I called function,it giving error.
select *
from v$version;
1
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi
2
PL/SQL Release 10.2.0.3.0 - Production
3
CORE              10.2.0.3.0
Production
4
TNS for Linux: Version 10.2.0.3.0 - Production
5
NLSRTL Version 10.2.0.3.0 - Production
function READ_SYSTEM_RESPONSE(PARAM IN CLOB)
  RETURN NUMBER
  AS
    l_namespace varchar2(1000):='xsi:schemaLocation="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader PackageProxy.xsd"
                                xmlns:sh="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader"
                                xmlns:ef="http://www.efatura.gov.tr/package-namespace"
                                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"';
    x  XMLTYPE
      := XMLTYPE('<?xml version="1.0" encoding="UTF-8"?>
                    <sh:StandardBusinessDocument xsi:schemaLocation="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader PackageProxy.xsd"
                      xmlns:sh="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader"
                      xmlns:ef="http://www.efatura.gov.tr/package-namespace"
                      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
                <sh:StandardBusinessDocumentHeader>
                <sh:HeaderVersion>1.0</sh:HeaderVersion>
                </sh:StandardBusinessDocumentHeader>
                </sh:StandardBusinessDocument>');
    CURSOR ana IS
          SELECT 1--EXTRACTVALUE(VALUE (p),'/sh:StandardBusinessDocumentHeader/sh:HeaderVersion',l_namespace) AS IMZA
          FROM TABLE(XMLSEQUENCE (EXTRACT (x,'/sh:StandardBusinessDocument',l_namespace))) p;
    BEGIN
    FOR r IN ana
    loop
    dbms_output.put_line('- - - - - - -');
    end loop;
    RETURN 1;
    EXCEPTION WHEN OTHERS THEN
    dbms_output.put_line(sqlerrm);
      RETURN 0;
    END;

Answer 1

odie_63 wrote:
Remove this from the l_namespace string, it has nothing to do in there, it's not a namespace declaration :
xsi:schemaLocation="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader PackageProxy.xsd
As a general rule, just declare the namespace(s) - default or prefixes - you need to resolve the XPath expression.
Once you correct that part, you'll discover that your query returns NULL.
That's because the XPath doesn't point to any node.
Try this instead :
SELECT EXTRACTVALUE(
        VALUE (p)
      , '/sh:StandardBusinessDocument/sh:StandardBusinessDocumentHeader/sh:HeaderVersion'
      , l_namespace
      ) AS IMZA
FROM TABLE(
      XMLSEQUENCE(
        EXTRACT (x, '/sh:StandardBusinessDocument', l_namespace)
    ) p
Thanks odie_63,You're right. I removed " xsi:schemaLocation="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader PackageProxy.xsd" and It is working!