Querying a date node

I have an indexed database that has some date nodes. When I run the query:
query 'collection("")/project[xs:date(obsblock/subObsblock/trial/trialObservationDate) = xs:date("2006-11-11")]'
I see it using the date index and it returns the proper documents. However if I do any search other than = I get an error:
stdin:28: query failed, Error: Invalid lexical value [err:FORG0001], <query>:1:81
collection("")/project[xs:date(obsblock/subObsblock/trial/trialObservationDate)
< xs:date("2006-11-11")]
^
I have tried >, <, lt, gt, etc. Does anyone know of a way to query dates with anything but =?
Doug

Here is the relavent data from the doxument:
<project>
     <obsblock>
          <obsblockID>123</obsblockID>
          <obsblockStatus>INCOMPLETE</obsblockStatus>
          <priority>0</priority>
          <subObsblock>
               <subObsblockID>none</subObsblockID>
               <trial>
                    <trialID>1</trialID>
                    <trialStatus>INCOMPLETE</trialStatus>
                    <trialObservationLength>0.0</trialObservationLength>
                    <trialObservationDate>2006-11-11</trialObservationDate>
               </trial>
          </subObsblock>
     </obsblock>
</project>
Doug

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    I need to pass a query in form of string to DBMS_XMLQUERY.GETXML package...the parameters to the query are date and varchar ..please help me build the string .Below is the query and the out put. ( the string is building fine except the parameters are with out quotes)
    here is the procedure
    create or replace
    procedure temp(
        P_MTR_ID VARCHAR2,
        P_FROM_DATE    IN DATE ,
        P_THROUGH_DATE IN DATE ) AS
        L_XML CLOB;
        l_query VARCHAR2(2000);
    BEGIN
    l_query:=  'SELECT
        a.s_datetime DATETIME,
        a.downdate Ending_date,
        a.downtime Ending_time,
        TO_CHAR(ROUND(a.downusage,3),''9999999.000'') kWh_Usage,
        TO_CHAR(ROUND(a.downcost,2),''$9,999,999.00'') kWh_cost,
        TO_CHAR(ROUND(B.DOWNUSAGE,3),''9999999.000'') KVARH
      FROM
        (SELECT s_datetime + .000011574 s_datetime,
          TO_CHAR(S_DATETIME ,''mm/dd/yyyy'') DOWNDATE,
          DECODE(TO_CHAR(s_datetime+.000011574 ,''hh24:'
          ||'mi''), ''00:'
          ||'00'',''24:'
          ||'00'', TO_CHAR(s_datetime+.000011574,''hh24:'
          ||'mi'')) downtime,
          s_usage downusage,
          s_cost downcost
        FROM summary_qtrhour
        WHERE s_mtrid = '
        ||P_MTR_ID||
       ' AND s_mtrch   = ''1''
        AND s_datetime BETWEEN TO_DATE('
        ||P_FROM_DATE||
        ',''DD-MON-YY'') AND (TO_DATE('
        ||P_THROUGH_DATE||
        ',''DD-MON-YY'') + 1)
        ) a,
        (SELECT s_datetime + .000011574 s_datetime,
          s_usage downusage
        FROM summary_qtrhour
        WHERE s_mtrid = '
        ||P_MTR_ID||
        ' AND s_mtrch   = ''2''
        AND s_datetime BETWEEN TO_DATE('
        ||P_FROM_DATE||
        ',''DD-MON-YY'') AND (TO_DATE('
        ||P_THROUGH_DATE||
        ','' DD-MON-YY'') + 1)
        ) B
      where a.S_DATETIME = B.S_DATETIME(+)';
    SELECT DBMS_XMLQUERY.GETXML('L_QUERY') INTO L_XML   FROM DUAL;
    INSERT INTO NK VALUES (L_XML);
    DBMS_OUTPUT.PUT_LINE('L_QUERY IS :'||L_QUERY);
    END;
    OUTPUT parameters are in bold (the issue is they are coming without single quotes otherwise th equery is fine
    L_QUERY IS :SELECT
        a.s_datetime DATETIME,
        a.downdate Ending_date,
        a.downtime Ending_time,
        TO_CHAR(ROUND(a.downusage,3),'9999999.000') kWh_Usage,
        TO_CHAR(ROUND(a.downcost,2),'$9,999,999.00') kWh_cost,
        TO_CHAR(ROUND(B.DOWNUSAGE,3),'9999999.000') KVARH
      FROM
        (SELECT s_datetime + .000011574 s_datetime,
          TO_CHAR(S_DATETIME ,'mm/dd/yyyy') DOWNDATE,
          DECODE(TO_CHAR(s_datetime+.000011574 ,'hh24:mi'), '00:00','24:00', TO_CHAR(s_datetime+.000011574,'hh24:mi')) downtime,
          s_usage downusage,
          s_cost downcost
        FROM summary_qtrhour
        WHERE s_mtrid = N3165 AND s_mtrch   = '1'
        AND s_datetime BETWEEN TO_DATE(01-JAN-13,'DD-MON-YY') AND (TO_DATE(31-JAN-13,'DD-MON-YY') + 1)
        ) a,
        (SELECT s_datetime + .000011574 s_datetime,
          s_usage downusage
        FROM summary_qtrhour
        WHERE s_mtrid = N3165 AND s_mtrch   = '2'
        AND s_datetime BETWEEN TO_DATE(01-JAN-13,'DD-MON-YY') AND (TO_DATE(31-JAN-13,' DD-MON-YY') + 1)
        ) B
      where a.S_DATETIME = B.S_DATETIME(+)

    The correct way to handle this is to use bind variables.
    And use DBMS_XMLGEN instead of DBMS_XMLQUERY :
    create or replace procedure temp (
      p_mtr_id       in varchar2
    , p_from_date    in date
    , p_through_date in date
    is
      l_xml   CLOB;
      l_query VARCHAR2(2000);
      l_ctx   dbms_xmlgen.ctxHandle;
    begin
      l_query:=  'SELECT
        a.s_datetime DATETIME,
        a.downdate Ending_date,
        a.downtime Ending_time,
        TO_CHAR(ROUND(a.downusage,3),''9999999.000'') kWh_Usage,
        TO_CHAR(ROUND(a.downcost,2),''$9,999,999.00'') kWh_cost,
        TO_CHAR(ROUND(B.DOWNUSAGE,3),''9999999.000'') KVARH
      FROM
        (SELECT s_datetime + .000011574 s_datetime,
          TO_CHAR(S_DATETIME ,''mm/dd/yyyy'') DOWNDATE,
          DECODE(TO_CHAR(s_datetime+.000011574 ,''hh24:'
          ||'mi''), ''00:'
          ||'00'',''24:'
          ||'00'', TO_CHAR(s_datetime+.000011574,''hh24:'
          ||'mi'')) downtime,
          s_usage downusage,
          s_cost downcost
        FROM summary_qtrhour
        WHERE s_mtrid = :P_MTR_ID
        AND s_mtrch   = ''1''
        AND s_datetime BETWEEN TO_DATE(:P_FROM_DATE,''DD-MON-YY'')
                           AND (TO_DATE(:P_THROUGH_DATE,''DD-MON-YY'') + 1)
        ) a,
        (SELECT s_datetime + .000011574 s_datetime,
          s_usage downusage
        FROM summary_qtrhour
        WHERE s_mtrid = :P_MTR_ID
        AND s_mtrch   = ''2''
        AND s_datetime BETWEEN TO_DATE(:P_FROM_DATE,''DD-MON-YY'')
                           AND (TO_DATE(:P_THROUGH_DATE,'' DD-MON-YY'') + 1)
        ) B
      where a.S_DATETIME = B.S_DATETIME(+)';
      l_ctx := dbms_xmlgen.newContext(l_query);
      dbms_xmlgen.setBindValue(l_ctx, 'P_MTR_ID', p_mtr_id);
      dbms_xmlgen.setBindValue(l_ctx, 'P_FROM_DATE', to_char(p_from_date, 'DD-MON-YY'));
      dbms_xmlgen.setBindValue(l_ctx, 'P_THROUGH_DATE', to_char(p_through_date, 'DD-MON-YY'));
      l_xml := dbms_xmlgen.getXML(l_ctx);
      dbms_xmlgen.closeContext(l_ctx);
      insert into nk values (l_xml);
    end;

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