Error with DTD duplicated SYSTEM inclusion

Question

I'm working with one of the latest releases
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
"CORE     11.2.0.1.0     Production"
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
I'm trying to insert xml into an XMLType table, and validate it with a DTD. To achieve this i created a folder /xmlmine/dtd and applied this acl to it
<acl description="dilbertacl" xmlns="http://xmlns.oracle.com/xdb/acl.xsd" xmlns:dav="DAV:" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/xdb/acl.xsd                                    http://xmlns.oracle.com/xdb/acl.xsd" shared="true">
      <ace>
        <grant>true</grant>
        <principal>DILBERT</principal>
        <privilege>
          <dav:all/>
        </privilege>
      </ace>
    </acl>i then uploaded this dtd to play.dtd with
DECLARE
  b BOOLEAN;
BEGIN
  b := DBMS_XDB.createResource('/xmlmine/dtd/play.dtd',bfilename('dtds', 'play.dtd'));
END;and i can see it with
select xdburitype('/xmlmine/dtd/play.dtd').getCLOB() from dual;
<!-- DTD for Shakespeare    J. Bosak    1994.03.01, 1997.01.02 -->
<!-- Revised for case sensitivity 1997.09.10 -->
<!-- Revised for XML 1.0 conformity 1998.01.27 (thanks to Eve Maler) -->
<!ENTITY amp "&#38;">
<!ELEMENT PLAY     (TITLE, FM, PERSONAE, SCNDESCR, PLAYSUBT, INDUCT?, PROLOGUE?, ACT+, EPILOGUE?)>
<!ELEMENT TITLE    (#PCDATA)>
<!ELEMENT FM       (P+)>
<!ELEMENT P        (#PCDATA)>
<!ELEMENT PERSONAE (TITLE, (PERSONA | PGROUP)+)>
<!ELEMENT PGROUP   (PERSONA+, GRPDESCR)>
<!ELEMENT PERSONA  (#PCDATA)>
<!ELEMENT GRPDESCR (#PCDATA)>
<!ELEMENT SCNDESCR (#PCDATA)>
<!ELEMENT PLAYSUBT (#PCDATA)>
<!ELEMENT INDUCT   (TITLE, SUBTITLE*, (SCENE+|(SPEECH|STAGEDIR|SUBHEAD)+))>
<!ELEMENT ACT      (TITLE, SUBTITLE*, PROLOGUE?, SCENE+, EPILOGUE?)>
<!ELEMENT SCENE    (TITLE, SUBTITLE*, (SPEECH | STAGEDIR | SUBHEAD)+)>
<!ELEMENT PROLOGUE (TITLE, SUBTITLE*, (STAGEDIR | SPEECH)+)>
<!ELEMENT EPILOGUE (TITLE, SUBTITLE*, (STAGEDIR | SPEECH)+)>
<!ELEMENT SPEECH   (SPEAKER+, (LINE | STAGEDIR | SUBHEAD)+)>
<!ELEMENT SPEAKER  (#PCDATA)>
<!ELEMENT LINE     (#PCDATA | STAGEDIR)*>
<!ELEMENT STAGEDIR (#PCDATA)>
<!ELEMENT SUBTITLE (#PCDATA)>
<!ELEMENT SUBHEAD  (#PCDATA)>when i proceed to insert with
INSERT INTO sestable VALUES (XMLType(bfilename('xmls', 'all_well.xml'),nls_charset_id('AL32UTF8')));the top of the xml document looks like
<?xml version="1.0" encoding="WINDOWS-1252"?>
<!DOCTYPE PLAY SYSTEM "/xmlmine/dtd/play.dtd" [
<!ELEMENT PLAY (TITLE, FM, PERSONAE, SCNDESCR, PLAYSUBT, INDUCT?, PROLOGUE?, ACT+, EPILOGUE?)>
<!ELEMENT TITLE (#PCDATA)>
<!ELEMENT FM (P+)>
<!ELEMENT SUBTITLE (#PCDATA)>
<!ELEMENT SUBHEAD (#PCDATA)>
]>
<!-- DTD for Shakespeare    J. Bosak    1994.03.01, 1997.01.02 -->
<!-- Revised for case sensitivity 1997.09.10 -->
<!-- Revised for XML 1.0 conformity 1998.01.27 (thanks to Eve Maler) -->
<PLAY>
  <TITLE>All&apos;s Well That Ends Well</TITLE>
  <FM>
    <P>Text placed in the public domain by Moby Lexical Tools, 1992.</P>
      <STAGEDIR>Exeunt</STAGEDIR>
    </EPILOGUE>
  </ACT>
</PLAY>but when i try to query the table with something like
select xtab.COLUMN_VALUE
from sestable, XMLTable('let $i := /PLAY/ACT/SCENE/SPEECH[SPEAKER eq "DUKE"]/LINE
                return count($i)' PASSING OBJECT_VALUE) xtab;i get an error
LPX-00107:Warning: element "PLAY" has multiple declaration
if i remove the SYSTEM keyword and simply inline the DTD everything works just fine.
I suspect the parser is inlining the DTD but not removing the SYSTEM directive, thus including the DTD twice, hence the error. Any suggestion on how to solve this?
Thanks in advance

Answer 1

What should I do now, since binary XML does not seems to validate? Is there any other way to validate the XML document with a DTD besides directly copying and pasting the DTD in the file?Well, as a workaround, you can disable DTD validation after the document has been inserted in the table.
SQL> select storage_type from user_xml_tables where table_name = 'PLAYS2';
STORAGE_TYPE
CLOB
SQL> SELECT count(*)
  2  FROM plays2 p
  3     , XMLTable( '/PLAY/ACT/SCENE/SPEECH[SPEAKER eq "DUKE"]/LINE'
  4                 passing p.object_value ) x
  5  WHERE XMLExists( '/PLAY[TITLE=$title]'
  6                   passing p.object_value
  7                        , 'All''s Well That Ends Well' as "title" )
  8  ;
SELECT count(*)
ERROR at line 1:
ORA-31011: XML parsing failed
ORA-19202: Error occurred in XML processing
LPX-00107: Warning: element "PLAY" has multiple declarations
Error at line 24
Error at line 7
SQL> alter session set events '31156 trace name context forever, level 2';
Session altered.
SQL> SELECT count(*)
  2  FROM plays2 p
  3     , XMLTable( '/PLAY/ACT/SCENE/SPEECH[SPEAKER eq "DUKE"]/LINE'
  4                 passing p.object_value ) x
  5  WHERE XMLExists( '/PLAY[TITLE=$title]'
  6                   passing p.object_value
  7                        , 'All''s Well That Ends Well' as "title" )
  8  ;
  COUNT(*)
        19
If this is a bug should I report it or you can do / have already done that?I didn't see anything in the documentation regarding DTD validation vs. binary XML, so yes I think you should report it to Oracle Support.