Orcale dbms_xmldom.writetobuffer() help

Dear Experts,
After successfully loading an XML file (6MB) into a dbms_xmldom.DOMDocument var (and dbms_xmldom.DOMNode var) I attempt to convert the Node into an XMLType using a two step process.
Step 1 - Call dbms_xmldom.writetobuffer(p_node, l_clob)
Step 2 - Call sys.xmltype.createXml(l_clob)

For small files both steps execute without error.  However, for larger files I get an error on Step 1 - Call dbms_xmldom.writetobuffer(p_node, l_clob).  Here's the error, "ORA-30185: output too large to fit in the buffer".  

The purpose for converting the NODE to an XMLTYPE is to save the data into a XMLTYPE table column.  Can anyone offer a suggestion on how to work around this?

Thanks.

function ToXmlType_
(
    p_node          in      dbms_xmldom.DOMNode
)
return sys.xmltype as
    l_xml           sys.xmltype;
    l_clob          clob;
begin
    dbms_xmldom.writetobuffer(p_node, l_clob);
    return sys.xmltype.createXml(l_clob);
end ToXmlType_;

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