Help - Nested XMLQuery (XQuery) Syntax

Question

I need to query a relational table that includes an XMLType column as Binary XML.  The XMLType column contains an XML document of arbitrary length. My query is in part dependent on relational column values and data values within the XML documents.  The body of the XML document, beneath the root element, is composed of 3 main sections (elements): Header1, 1/document; Header2, 1/document; and Details, 1/document.  The Details section is composed of multiple, arbitrary in number, Detail sections (elements). Example data and table layout are below.
For a particular TLID or CUST, or SHIP_DATE, etc. I need to return the Header1, Header2, and multiple Detail sections where element values within particular Detail sections match additional qualifications.
If I just want to return the Detail sections, I can do this successfully with the following query:
select cust,  tlid,  xmlquery('declare default element namespace "http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd"; (::)
                        for $i in /C52R09/DETAILS/DETAIL
                        where $i/OrderNumber = "SBC00999"
                        return $i' PASSING xml_doc
                        RETURNING CONTENT).getClobVal() detail
from xml_truck_info
where tlid = '424500'
    and  xmlexists('declare default element namespace "http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd"; (::)
                 $x/C52R09/HEADER1[TruckNumber = "424500"]' PASSING xml_doc AS "x");
I need, however, to return the Header1 and Header2 sections once per document if the query returns any Detail sections, regardless of  whether the query returns 1 or multiple Detail sections.
My impression is that this will require a nested XQuery.  I haven't had success getting the syntax correct for this.  I've wasted a tremendous amount of time searching the web for examples that would replicate my scenario.  It seems there is a dearth of detailed, clear info and examples available on Oracle's XQuery implementation and structure.  I found a few examples that approximate what I'm trying to do; however, when I tweak them, the query spits up.
Based on the following 2 examples pulled from the web or Oracle documentation:
SELECT rownum, XMLQuery(
   <counties>
    {for $c in ora:view("CHAMBER_OF_COMMERCE")
     let $coc_county := $c/ROW/COC_COUNTY/text(),
         $coc_name := $c/ROW/COC_NAME,
         $coc_phone := $c/ROW/COC_PHONE/textb()
     where $coc_county = $cc_county/county/text()
     order by $coc_county
     return
        <county population="{xs:unsignedInt(sum(/cities/city/population))}">
           <name>{$coc_county}</name>
           <chamber phone="{$coc_phone}">{$coc_name/text()}</chamber>
           <attractions>
              {for $a in collection("/public")
               where $coc_county = $a/attraction/county/text()
               return $a
           </attractions>
        </county>}
    </counties>
    PASSING BY VALUE cc_city_populations,
       XMLTYPE('<county>' || cc_county || '</county>') AS "cc_county"
    RETURNING CONTENT)
FROM county_census;
and
SELECT XMLQuery(
'for $i in $h//channel
return
<headlines>
<title>OTN new articles on Oracle Solaris</title>
<items>
     for $j in $h//item
     where ora:contains($j, "Oracle Solaris")
     return <item> {($j/title, $j/link)}</item>
</items>
</headlines>'
PASSING xmlparse (document httpuritype ('http://feeds.delicious.com/v2/rss/OracleTechnologyNetwork/
otntecharticle').getCLOB()) as "h"
RETURNING CONTENT).getStringVal() as RESULT FROM DUAL;
I have modified my simple, successful query above to the following:
select tlid, XMLQuery('declare default element namespace "http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd"; (::)
              for $i in /C52R09
              return
                <Headers>
                  "{$i/Header1}"
                  "{$i/Header2}"
                </Headers>
                    for $x in $i/DETAILS/DETAIL
                    where $x/MarvinOrderNumber = "SBC00999"
                    return $x
                PASSING xml_doc
              RETURNING CONTENT).getClobVal() detail
from xml_truck_info
where TLID = '424500'
    and  xmlexists('declare default element namespace "http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd"; (::)
                 $x/C52R09/HEADER1[TruckNumber = "424500"]' PASSING xml_doc AS "x");
When run in SQLDeveloper the result consistently reflects an issue with the curly braces '{}' around the second 'for' expression.  I have run this with different iterations, to include removing the curly braces around the $i/Header1 and $i/Header2 sections.  It makes no difference.  I get similar results as follows:
Error at Command Line:16 Column:6
Error report:
SQL Error: ORA-19114: XPST0003 - error during parsing the XQuery expression:
LPX-00801: XQuery syntax error at '{'
9                   {
-                   ^
19114. 00000 -  "error during parsing the XQuery expression: %s"
*Cause:    An error occurred during the parsing of the XQuery expression.
*Action:   Check the detailed error message for the possible causes.
My table, XML_TRUCK_INFO, looks like this:
Name                Type
CUST                VARCHAR2(7)
LOC                 VARCHAR2(5)
TLID                NUMBER
STID                NUMBER
SHIP_DATE           DATE
SHIPPED_FLAG        VARCHAR2(1)
XML_DOC             SYS.XMLTYPE STORAGE BINARY    
Here is a sample of the XML_DOC content that I am running  the XQuery against.
<?xml version="1.0" standalone="yes"?>
<C52R09 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamspaceSchemaLocation="http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd                                           
        http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd">
  <HEADER1>
    <TruckNumber>424500</TruckNumber>
    <StopID>16</StopID>
    <ShipFrom>CITYNAME</ShipFrom>
    <ShippingDate>10-JUN-2013</ShippingDate>
    <PlannedDepartureDate>10-JUN-2013 05:00</PlannedDepartureDate>
    <ETADate>11-JUN-2013</ETADate>
    <LoadName>SW 29</LoadName>
    <StopName>16-FREEPORT, </StopName>
    <StopComment/>
    <TruckStatus>INVOICED</TruckStatus>
    <ReportType>C</ReportType>
  </HEADER1>
  <HEADER2>
    <DestAddrName>CUSTOMER-BUSINESS-NAME</DestAddrName>
    <DestAddrLine1>23 EAST 4TH AVENUE</DestAddrLine1>
    <DestAddrLine2/>
    <DestCity/>
    <DestState/>
    <DestZip>55555</DestZip>
  </HEADER2>
  <DETAILS>
    <DETAIL>
      <OrderNumber>SBC00999</OrderNumber>
      <LineNumber>3</LineNumber>
      <OrderType>STANDARD SALES ORDER</OrderType>
      <OrderStatus>SHIPPED COMPLETE</OrderStatus>
      <OrderDate>23-MAY-2013</OrderDate>
      <JobName>Job1</JobName>
      <QtyOrdered>3</QtyOrdered>
      <QtyShipped>3</QtyShipped>
      <WeekofDelivery>10-JUN-2013</WeekofDelivery>
      <Status>THIS TRUCK</Status>
      <CustomerNumber>5000-000</CustomerNumber>
      <CustomerName>CUSTNAME1</CustomerName>
      <CustomerPONumber>W163409</CustomerPONumber>
      <CubicFeet>4.56</CubicFeet>
      <ListPrice>677</ListPrice>
      <SpecialMQSCode>
        <ProductType>AAZG</ProductType>
        <UnitType>ABEG</UnitType>
      </SpecialMQSCode>
      <ShortDescription>INSERT ASSEMBLY</ShortDescription>
      <OpeningCount>5</OpeningCount>
      <TrackingLines>
        <TrackingNo>0YD746</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:05</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
        <TrackingNo>0YD747</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:31</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
        <TrackingNo>0YD748</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:06</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
      </TrackingLines>
    </DETAIL>
    <DETAIL>
      <OrderNumber>SBC00999</OrderNumber>
      <LineNumber>4</LineNumber>
      <OrderType>STANDARD SALES ORDER</OrderType>
      <OrderStatus>SHIPPED COMPLETE</OrderStatus>
      <OrderDate>23-MAY-2013</OrderDate>
      <JobName>Job1</JobName>
      <QtyOrdered>3</QtyOrdered>
      <QtyShipped>3</QtyShipped>
      <WeekofDelivery>10-JUN-2013</WeekofDelivery>
      <Status>THIS TRUCK</Status>
      <CustomerNumber>5000-000</CustomerNumber>
      <CustomerName>CUSTNAME1</CustomerName>
      <CustomerPONumber>W163409</CustomerPONumber>
      <CubicFeet>4.56</CubicFeet>
      <ListPrice>677</ListPrice>
      <SpecialMQSCode>
        <ProductType>AAZG</ProductType>
        <UnitType>ABEG</UnitType>
      </SpecialMQSCode>
      <ShortDescription>INSERT ASSEMBLY</ShortDescription>
      <OpeningCount>5</OpeningCount>
      <TrackingLines>
        <TrackingNo>0YD749</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:05</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
        <TrackingNo>0YD750</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:05</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
        <TrackingNo>0YD751</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 06:46</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
      </TrackingLines>
    </DETAIL>
    <DETAIL>
      <OrderNumber>SBC00999</OrderNumber>
      <LineNumber>5</LineNumber>
      <OrderType>STANDARD SALES ORDER</OrderType>
      <OrderStatus>SHIPPED COMPLETE</OrderStatus>
      <OrderDate>23-MAY-2013</OrderDate>
      <JobName>Job1</JobName>
      <QtyOrdered>2</QtyOrdered>
      <QtyShipped>2</QtyShipped>
      <WeekofDelivery>10-JUN-2013</WeekofDelivery>
      <Status>THIS TRUCK</Status>
      <CustomerNumber>5000-000</CustomerNumber>
      <CustomerName>CUSTNAME1</CustomerName>
      <CustomerPONumber>W163409</CustomerPONumber>
      <CubicFeet>4.56</CubicFeet>
      <ListPrice>677</ListPrice>
      <SpecialMQSCode>
        <ProductType>AAZG</ProductType>
        <UnitType>ABEG</UnitType>
      </SpecialMQSCode>
      <ShortDescription>INSERT ASSEMBLY</ShortDescription>
      <OpeningCount>5</OpeningCount>
      <TrackingLines>
        <TrackingNo>0YD752</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:05</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
        <TrackingNo>0YD753</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:42</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
      </TrackingLines>
    </DETAIL>
    <DETAIL>
      <OrderNumber>SBC01011</OrderNumber>
      <LineNumber>1</LineNumber>
      <OrderType>STANDARD SALES ORDER</OrderType>
      <OrderStatus>SHIPPED COMPLETE</OrderStatus>
      <OrderDate>28-MAY-2013</OrderDate>
      <JobName>Job2</JobName>
      <QtyOrdered>4</QtyOrdered>
      <QtyShipped>4</QtyShipped>
      <WeekofDelivery>10-JUN-2013</WeekofDelivery>
      <Status>THIS TRUCK</Status>
      <CustomerNumber>5000-000</CustomerNumber>
      <CustomerName>CUSTNAME1</CustomerName>
      <CustomerPONumber>W163766</CustomerPONumber>
      <CubicFeet>4.6</CubicFeet>
      <ListPrice>823</ListPrice>
      <SpecialMQSCode>
        <ProductType>AAZG</ProductType>
        <UnitType>ABEG</UnitType>
      </SpecialMQSCode>
      <ShortDescription>INSERT ASSEMBLY</ShortDescription>
      <OpeningCount>5</OpeningCount>
      <TrackingLines>
        <TrackingNo>0YV016</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:46</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
        <TrackingNo>0YV017</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:25</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
        <TrackingNo>0YV018</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 06:51</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
        <TrackingNo>0YV019</TrackingNo>
        <TrackingStatus>Shipped</TrackingStatus>
        <ScanData>
          <ScanDate>11-JUN-2013 07:22</ScanDate>
          <Signature>mark</Signature>
          <ScanStatus>SCANNED</ScanStatus>
        </ScanData>
      </TrackingLines>
    </DETAIL>
  </DETAILS>
</C52R09>
I would appreciate any help and/or insights from others more experienced in this than I.
Thanks in advance,
Paul

Answer 1

Sorry, as I look back at the declaration in the root element included in the example, I must have used an older version of the data.  The root element with declarations should have been this:
<C52R09 xmlns="http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:SchemaLocation="http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd                                 
http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd">
I've included the query with the declaration (using data values in the table, but different from those in the example) and the result below:
PK_XML-MOS2>>select tlid
  2       , XMLQuery('declare default element namespace "http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd"; (::)
  3           let $dtls := /C52R09/DETAILS/DETAIL[OrderNumber=$order_no]
  4            return if ($dtls) then
  5            <Doc>
  6            {
  7              <Headers>{ /C52R09/HEADER1, /C52R09/HEADER2 }</Headers>
  8            , <Details>{ $dtls }</Details>
  9            }
10            </Doc>
11            else ()'
12           PASSING xml_doc
13                 , '17Z00266' as "order_no"
14           RETURNING CONTENT
15         ).getClobVal() detail
16  from xml_truck_info
17  where tlid = 398043
18    and xmlexists('declare default element namespace "http://abhist.acme.com:8080/acme/schema/C52R09_v2.xsd"; (::)
19          /C52R09/HEADER1[TruckNumber=$truck_no]'
20          PASSING xml_doc
21                , '398043' as "truck_no"
22        );
More .....
      TLID  DETAIL
    398043   
I've included the query without the declaration (same data values as above) and the result below:
PK_XML-MOS2>>select tlid
   2       , XMLQuery('let $dtls := /C52R09/DETAILS/DETAIL[OrderNumber=$order_no]
   3            return if ($dtls) then
   4            <Doc>
   5            {
   6              <Headers>{ /C52R09/HEADER1, /C52R09/HEADER2 }</Headers>
   7            , <Details>{ $dtls }</Details>
   8            }
   9            </Doc>
  10            else ()'
  11           PASSING xml_doc
  12                 , '17Z00266' as "order_no"
  13           RETURNING CONTENT
  14         ).getClobVal() detail
  15  from xml_truck_info
  16  where tlid = 398043
  17    and xmlexists('/C52R09/HEADER1[TruckNumber=$truck_no]'
  18          PASSING xml_doc
  19                , '398043' as "truck_no"
  20        );
no rows selected
The first example, with the declaration, returns the TLID value, although no detail section.  Whereas, the second, without the declaration, finds nothing to return.
Thanks again.