Best way to extract XML value wiith an xpath

Hello,
I wonder what is the best way to extract text value from XmlType with an xpath.
I need to insert a row inside a table where the row's data come from xpath extractions of an XmlType. I do a lot of (approximative 20) :
EXTRACTVALUE(var.myxmltype , '/an/xpath/to/extract/elem1').
EXTRACTVALUE(var.myxmltype , '/an/xpath/to/extract/elemI').
EXTRACTVALUE(var.myxmltype , '/an/xpath/to/extract/elem20').
inside the insert statement
Is this way is the best or is there a more optimal way ?
For example extracting the node '/an/xpath/to/extract/' and sarting from this node extracting "elem1", ... , "elemI", "elemN" children.
Thanks for your help,
Regards,
Nicolas

Hi Nicolas,
The answer depends on your actual storage method (binary, OR, CLOB?), and db version.
You can try XMLTable, it might be better in this case :
SELECT x.elem1, x.elem2, ... , x.elem20
FROM your_table t
   , XMLTable(
      '/an/xpath/to/extract'
      passing t.myxmltype
      columns elem1  varchar2(30) path 'elem1'
            , elem2  varchar2(30) path 'elem2'
            , elem20 varchar2(30) path 'elem20'
     ) x
;

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    <xs:attribute name="D" type="xs:string" />
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    <tns:ThirdChildB C="cc" D="dd" />
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    I registered the schema using Enterprise Manager. The "Show SQL" function returned this script:
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    schemadoc => sys.UriFactory.getUri('/Testing/test.xsd'),
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    gentypes => FALSE,
    genbean => FALSE,
    gentables => TRUE,
    force => FALSE,
    owner => 'EMILIAROMAGNABUY',
    OPTIONS => DBMS_XMLSCHEMA.REGISTER_BINARYXML);
    END;
    This is my test script:
    -- This works fine: returns only the requested row.
    SELECT XMLQuery('declare default element namespace "http://OracleTest"; collection("/Testing")/MyElement/SecondChild[@B=true()]' returning content) from dual;
    -- This raises the error = SQL Error: ORA-31038: Invalid hexBinary value: "true"
    select xmlquery('declare default element namespace "http://OracleTest"; /MyElement/SecondChild[@B=true()]' passing object_value returning content).getclobval() from "MyElement";
    -- This doesn't work correctly: returns the requested row and two empty rows ?!? I don't like this cast, anyway.
    select xmlquery('declare default element namespace "http://OracleTest"; /MyElement/SecondChild[string(@B)="true"]' passing object_value returning content).getclobval() from "MyElement";
    Thank you
    Mirko

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