PL/SQL and XML

Hello to everybody.
First of all, sorry for my english.
I have to make a PL, where in someplace I have a varchar with this content:
<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><HelloWorldResponse xmlns="http://prueba/LlamadaPLWS"><HelloWorldResult>prueba</HelloWorldResult></HelloWorldResponse></soap:Body></soap:Envelope>
Any idea of how can a get the content of the 'HelloWorldResult' tag inside the PL???
In this case it would be 'prueba'.
As you can imagine, I´m a novice in this area.
Thanks a lot in advance.

SQL> with t as (select xmltype('<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/env
elope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><HelloWorldRes
ponse xmlns="http://prueba/LlamadaPLWS"><HelloWorldResult>prueba</HelloWorldResult></HelloWorldResponse></soap:Body></soap:Envelope>
') as myxml from dual)
  2  -- END OF TEST DATA
  3  select extract(myxml, '//HelloWorldResult/text()', 'xmlns="http://prueba/LlamadaPLWS"').GetClobVal()
  4  from t
  5  /
EXTRACT(MYXML,'//HELLOWORLDRESULT/TEXT()','XMLNS="HTTP://PRUEBA/LLAMADAPLWS"').G
prueba
SQL>

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    Thanks in advance.
    Below is the output of
    select owner, object_name, object_type from dba_objects where status like 'INVALID';
    OWNER OBJECT_NAME OBJECT_TYPE
    XDB DBMS_XDBUTIL_INT PACKAGE
    XDB SETMODFLG PROCEDURE
    XDB DBMS_XDBZ0 PACKAGE BODY
    XDB DBMS_XDBUTIL_INT PACKAGE BODY
    PUBLIC DBMS_XDBUTIL_INT SYNONYM
    XDB XDB$PATCHUPSCHEMA PROCEDURE
    OLAPSYS ALL$OLAP2_AW_CATALOGS VIEW
    PUBLIC ALL_OLAP2_AW_CATALOGS SYNONYM
    OLAPSYS ALL$OLAP2_AW_CATALOG_MEASURES VIEW
    PUBLIC ALL_OLAP2_AW_CATALOG_MEASURES SYNONYM
    OLAPSYS ALL$OLAP2_AW_PHYS_OBJ VIEW
    PUBLIC ALL_OLAP2_AW_PHYS_OBJ SYNONYM
    OLAPSYS ALL$OLAP2_AW_PHYS_OBJ_PROP VIEW
    PUBLIC ALL_OLAP2_AW_PHYS_OBJ_PROP SYNONYM
    OLAPSYS ALL$OLAP2_AW_DIMENSIONS VIEW
    PUBLIC ALL_OLAP2_AW_DIMENSIONS SYNONYM
    OLAPSYS ALL$OLAP2_AW_ATTRIBUTES VIEW
    PUBLIC ALL_OLAP2_AW_ATTRIBUTES SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBES VIEW
    PUBLIC ALL_OLAP2_AW_CUBES SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_DIM_USES VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_DIM_USES SYNONYM
    OLAPSYS ALL$AW_DIM_ENABLED_VIEWS VIEW
    PUBLIC ALL_AW_DIM_ENABLED_VIEWS SYNONYM
    OLAPSYS ALL$AW_CUBE_ENABLED_VIEWS VIEW
    PUBLIC ALL_AW_CUBE_ENABLED_VIEWS SYNONYM
    OLAPSYS ALL$AW_CUBE_ENABLED_HIERCOMBO VIEW
    PUBLIC ALL_AW_CUBE_ENABLED_HIERCOMBO SYNONYM
    OLAPSYS ALL$OLAP2_AW_DIM_LEVELS VIEW
    PUBLIC ALL_OLAP2_AW_DIM_LEVELS SYNONYM
    OLAPSYS ALL$OLAP2_AW_DIM_HIER_LVL_ORD VIEW
    PUBLIC ALL_OLAP2_AW_DIM_HIER_LVL_ORD SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_MEASURES VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_MEASURES SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_AGG_SPECS VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_AGG_SPECS SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_AGG_MEAS VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_AGG_MEAS SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_AGG_LVL VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_AGG_LVL SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_AGG_OP VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_AGG_OP SYNONYM
    OLAPSYS MRAC_OLAP2_AW_DIMENSIONS_V VIEW
    OLAPSYS MRAC_OLAP2_AW_CUBES_V VIEW
    OLAPSYS MRAC_OLAP2_AW_CUBE_MEASURES_V VIEW
    PUBLIC MRV_OLAP2_AW_DIMENSIONS SYNONYM
    PUBLIC MRV_OLAP2_AW_CUBES SYNONYM
    PUBLIC MRV_OLAP2_AW_CUBE_MEASURES SYNONYM
    OLAPSYS CWM2_OLAP_METADATA_REFRESH PACKAGE BODY
    OLAPSYS OLAP_SYS_AW_ACCESS_DIM_VIEW VIEW
    OLAPSYS OLAP_SYS_AW_ACCESS_CUBE_VIEW VIEW
    OLAPSYS OLAP_SYS_AW_ENABLE_ACCESS_VIEW VIEW
    PUBLIC OLAP_SYS_AW_ACCESS_CUBE_VIEW SYNONYM
    PUBLIC OLAP_SYS_AW_ACCESS_DIM_VIEW SYNONYM
    PUBLIC OLAP_SYS_AW_ENABLE_ACCESS_VIEW SYNONYM
    OLAPSYS CWM2_OLAP_OLAPAPI_ENABLE PACKAGE BODY
    OLAPSYS DBMS_AWM PACKAGE BODY
    OLAPSYS CWM2_OLAP_CUBE PACKAGE BODY

    This note explains 80% of the problem: 42 invalid objects are normal, I have 52 invalid objects.
    I have re-executed the catpatch.sql script, I couldn't find any errors in the output. At the end Oracle Intermedia and Oracle Expression Filter remain invalid.
    last lines of catpatch.sql output:
    COMP_NAME STATUS VERSION
    OLAP Analytic Workspace OPTION OFF 10.1.0.3.0
    Oracle OLAP API OPTION OFF 10.1.0.3.0
    Oracle Database Catalog Views VALID 10.1.0.4.0
    Oracle Database Packages and Types VALID 10.1.0.4.0
    JServer JAVA Virtual Machine VALID 10.1.0.4.0
    Oracle XDK VALID 10.1.0.4.0
    Oracle Database Java Packages VALID 10.1.0.4.0
    Oracle XML Database VALID 10.1.0.4.0
    Oracle interMedia INVALID 10.1.0.4.0
    Oracle Text VALID 10.1.0.4.0
    Oracle Ultra Search VALID 10.1.0.4.0
    Oracle Expression Filter INVALID 10.1.0.4.0
    Oracle Enterprise Manager VALID 10.1.0.4.0
    Oracle Workspace Manager VALID 10.1.0.2.0
    Oracle Data Mining OPTION OFF 10.1.0.3.0
    OLAP Catalog OPTION OFF 10.1.0.3.0
    Spatial OPTION OFF 10.1.0.3.0
    SQL> select owner, object_name, object_type from dba_objects where status like 'INVALID';
    OWNER OBJECT_NAME OBJECT_TYPE
    WK_TEST BIN$9oUB6zbaOP/gMCzPA4J5+w==$0 TRIGGER
    OLAPSYS ALL$OLAP2_AW_CATALOGS VIEW
    PUBLIC ALL_OLAP2_AW_CATALOGS SYNONYM
    OLAPSYS ALL$OLAP2_AW_CATALOG_MEASURES VIEW
    PUBLIC ALL_OLAP2_AW_CATALOG_MEASURES SYNONYM
    OLAPSYS ALL$OLAP2_AW_PHYS_OBJ VIEW
    PUBLIC ALL_OLAP2_AW_PHYS_OBJ SYNONYM
    OLAPSYS ALL$OLAP2_AW_PHYS_OBJ_PROP VIEW
    PUBLIC ALL_OLAP2_AW_PHYS_OBJ_PROP SYNONYM
    OLAPSYS ALL$OLAP2_AW_DIMENSIONS VIEW
    PUBLIC ALL_OLAP2_AW_DIMENSIONS SYNONYM
    OLAPSYS ALL$OLAP2_AW_ATTRIBUTES VIEW
    PUBLIC ALL_OLAP2_AW_ATTRIBUTES SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBES VIEW
    PUBLIC ALL_OLAP2_AW_CUBES SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_DIM_USES VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_DIM_USES SYNONYM
    OLAPSYS ALL$AW_DIM_ENABLED_VIEWS VIEW
    PUBLIC ALL_AW_DIM_ENABLED_VIEWS SYNONYM
    OLAPSYS ALL$AW_CUBE_ENABLED_VIEWS VIEW
    PUBLIC ALL_AW_CUBE_ENABLED_VIEWS SYNONYM
    OLAPSYS ALL$AW_CUBE_ENABLED_HIERCOMBO VIEW
    PUBLIC ALL_AW_CUBE_ENABLED_HIERCOMBO SYNONYM
    OLAPSYS ALL$OLAP2_AW_DIM_LEVELS VIEW
    PUBLIC ALL_OLAP2_AW_DIM_LEVELS SYNONYM
    OLAPSYS ALL$OLAP2_AW_DIM_HIER_LVL_ORD VIEW
    PUBLIC ALL_OLAP2_AW_DIM_HIER_LVL_ORD SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_MEASURES VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_MEASURES SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_AGG_SPECS VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_AGG_SPECS SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_AGG_MEAS VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_AGG_MEAS SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_AGG_LVL VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_AGG_LVL SYNONYM
    OLAPSYS ALL$OLAP2_AW_CUBE_AGG_OP VIEW
    PUBLIC ALL_OLAP2_AW_CUBE_AGG_OP SYNONYM
    OLAPSYS MRAC_OLAP2_AW_DIMENSIONS_V VIEW
    OLAPSYS MRAC_OLAP2_AW_CUBES_V VIEW
    OLAPSYS MRAC_OLAP2_AW_CUBE_MEASURES_V VIEW
    PUBLIC MRV_OLAP2_AW_DIMENSIONS SYNONYM
    PUBLIC MRV_OLAP2_AW_CUBES SYNONYM
    PUBLIC MRV_OLAP2_AW_CUBE_MEASURES SYNONYM
    OLAPSYS CWM2_OLAP_METADATA_REFRESH PACKAGE BODY
    OLAPSYS OLAP_SYS_AW_ACCESS_DIM_VIEW VIEW
    OLAPSYS OLAP_SYS_AW_ACCESS_CUBE_VIEW VIEW
    OLAPSYS OLAP_SYS_AW_ENABLE_ACCESS_VIEW VIEW
    PUBLIC OLAP_SYS_AW_ACCESS_CUBE_VIEW SYNONYM
    PUBLIC OLAP_SYS_AW_ACCESS_DIM_VIEW SYNONYM
    PUBLIC OLAP_SYS_AW_ENABLE_ACCESS_VIEW SYNONYM
    OLAPSYS CWM2_OLAP_OLAPAPI_ENABLE PACKAGE BODY
    OLAPSYS DBMS_AWM PACKAGE BODY
    OLAPSYS CWM2_OLAP_CUBE PACKAGE BODY
    53 rows selected.

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