How to update custom metadata?

Question

Hi,
I have created a xml document (schema based) in the repository.
I append with appendResourceMetadata a xml document (also schema based)
Now I try to change an element value of the metadata with the folowing update command but the value do not change. Why? What is wrong?
a) update resource_view set res = updateXML(res,'//CMSWorkflow/State/text()','submitted','xmlns="http://xmlns.oracle.com/xdb/CMSWorkflow"') where any_path = '/siecom/Australia/CCMIGhtml_test.xml'
b) update resource_view set res = updateXML(res,'/r:Resource/CMSWorkflow/State/text()','submitted','xmlns:r="http://xmlns.oracle.com/xdb/XDBResource.xsd"') where any_path = '/siecom/Australia/CCMIGhtml_test.xml'
c) update resource_view set res = updateXML(res,'/r:Resource/w:CMSWorkflow/w:State/text()','submitted','xmlns:r="http://xmlns.oracle.com/xdb/XDBResource.xsd" xmlns:w="http://xmlns.oracle.com/xdb/CMSWorkflow"') where any_path = '/siecom/Australia/CCMIGhtml_test.xml'
Any help are realy welcome.
Note: if I update with updateResourceMetadata it works, but this meen to update the full document not only one element!
Oliver

Answer 1

In general it's more efficient to directly update the table that contains the metadata...
Eg
set long 100000
set echo on
alter session Set events='19027 trace name context forever,level 4'
select count(*)
  from IMAGE_METADATA_TABLE
select object_value
  from IMAGE_METADATA_TABLE m, RESOURCE_VIEW r
where m.RESID = r.RESID
   and equals_path(res,'/home/SCOTT/ImageLibrary/Norwich (3).jpg') = 1
update IMAGE_METADATA_TABLE m
   set object_value = insertChildXML
                         object_value,
                         '/imageMetadata',
                         'Title',
                         xmltype('<Title xmlns="http://xmlns.oracle.com/demo/imageMetadata">Norwich Catherdral from Ethelbert Gate</Title>'),
                         'xmlns="http://xmlns.oracle.com/demo/imageMetadata"'
where m.RESID = 
         select RESID
           from RESOURCE_VIEW
          where equals_path(res,'/home/SCOTT/ImageLibrary/Norwich (3).jpg') = 1
declare
   text CLOB :=
'In the heart of Norwich stands the Cathedral, separated from the busy streets by flint walls and entrance gates, but still a living part of the city. At least three services are held in the Cathedral every day, often sung by the choir. The choristers are pupils of King Edward VI School, which has its daily assembly in the Cathedral. Concerts, lectures and exhibitions also frequently take place here.
The Cathedral was begun in 1096, the vision of Herbert de Losinga, first bishop of Norwich. Building work on the Cathedral, a bishop''s palace and the associated Benedictine monastery continued throughout his life, but the Cathedral was not finally consecrated until 1278. The building is mainly of Caen stone, a pale, honey-coloured limestone brought over from Normandy, but Norfolk flints form the core of the Cathedral, and stone from Northamptonshire was used for medieval additions.
This great church has a Norman ground plan and walls, and a Perpendicular roof and spire, added after a fire caused by lightning destroyed the wooden roof and spire in 1463. The Cathedral spire is 315 ft (96m) high - second only in height to that of Salisbury.';
begin
  update IMAGE_METADATA_TABLE m
     set object_value = insertChildXML
                           object_value,
                           '/imageMetadata',
                           'Description',
                           xmltype('<Description xmlns="http://xmlns.oracle.com/demo/imageMetadata">' || text || '</Description>'),
                           'xmlns="http://xmlns.oracle.com/demo/imageMetadata"'
where m.RESID = 
         select RESID
           from RESOURCE_VIEW
          where equals_path(res,'/home/SCOTT/ImageLibrary/Norwich (3).jpg') = 1
end;
commit
pause
select object_value
  from IMAGE_METADATA_TABLE m, RESOURCE_VIEW r
where m.RESID = r.RESID
   and equals_path(res,'/home/SCOTT/ImageLibrary/Norwich (3).jpg') = 1
pause
alter session Set events='19027 trace name context forever,level 4'
update IMAGE_METADATA_TABLE m
   set object_value = insertChildXML
                         object_value,
                         '/imageMetadata',
                         'Title',
                         xmltype('<Title xmlns="http://xmlns.oracle.com/demo/imageMetadata">Concorde From the Concorde Lounge at British Airways Terminal 1</Title>'),
                         'xmlns="http://xmlns.oracle.com/demo/imageMetadata"'
where m.RESID = 
         select RESID
           from RESOURCE_VIEW
          where equals_path(res,'/home/SCOTT/ImageLibrary/Concorde.jpg') = 1
declare
  narrativeText CLOB := 'Concorde measures 204ft in length - stretching between six and ten inches in-flight due to heating of the airframe. She is painted in a specially developed white paint to accommodate these changes and to dissipate the heat generated by supersonic flight. The wingspan is 83ft 8ins - much less than conventional subsonic aircraft as Concorde flies in totally a different way using "Vortex Lift" to achieve her exceptional performance. The height is 37ft 1ins. The characteristic droop nose is lowered to improve pilots'' visibility for take-off and landing.'
|| CHR(13) || CHR (13) ||
'Power: Concorde''s four engines - specially designed Rolls-Royce/ Snecma Olympus 593s - give more than 38,000lbs of thrust each, with ''reheat''. This adds fuel to the final stage of the engine to produce the extra power required for take-off and the transition to supersonic flight. They are the most powerful pure jet engines flying commercially.'
|| CHR(13) || CHR (13) ||
'Speed: Concorde takes off at 220 knots (250mph) (compared with 165 knots for most subsonic aircraft). She cruises at around 1350mph - more than twice the speed of sound - and at an altitude of up to 60,000 ft (over 11 miles high). A typical London to New York crossing takes a little less than three and a half hours as opposed to about eight hours for a subsonic flight. Travelling Westwards, the five-hour time difference means Concorde effectively arrives before she has taken off. She travels "faster than the sun".'
|| CHR(13) || CHR (13) ||
'Service: More than 2.5 million passengers have flown supersonically on British Airways'' Concorde since she entered commercial service in 1976. The most frequent passenger, an oil company executive, has clocked up almost 70 round trip transatlantic crossings a year.'
|| CHR(13) || CHR (13) ||
'Safety Enhancements: A team of about 250 British Airways'' engineers worked tirelessly, together with the relevant authorities, to further improve safety on board. The engineers and manufacturers have worked closely together to create and install a new Kevlar-rubber lining for Concorde''s wing-based fuel tanks and the addition of specially developed Michelin tyres, as well as strengthened wiring in the undercarriage.'
|| CHR(13) || CHR (13) ||
'History: Supersonic airline research in Europe began in 1956 and resulted in the British and French Governments signing an international treaty for the joint design, development and manufacture of a supersonic airliner six years later. The first prototype was rolled out at Toulouse in 1967 and since then, there have been a number of notable dates in the history of Concorde.'
|| CHR(13) || CHR (13) ||
'2 March 1969: First flight of Concorde 001 from Toulouse France.'
|| CHR(13) || CHR (13) ||
'9 April 1969 :First flight of Concorde 002 from Filton, Bristol, UK to its test centre at Fairford.'
|| CHR(13) || CHR (13) ||
'1 October 1969: Concorde''s first supersonic flight.'
|| CHR(13) || CHR (13) ||
'28 June 1972: British Airways (BOAC) orders five Concordes.'
|| CHR(13) || CHR (13) ||
'20 September 1973: Concorde 002 lands at Dallas/ Fort Worth on first visit to the USA.'
|| CHR(13) || CHR (13) ||
'17 June 1974: Concorde makes its first double Atlantic crossing in one day.'
|| CHR(13) || CHR (13) ||
'5 December 1975: UK Civil Aviation Authority awards Concorde its Certificate of Airworthiness.'
|| CHR(13) || CHR (13) ||
'21 January 1976: British Airways commences commercial supersonic travel from London to Bahrain.'
|| CHR(13) || CHR (13) ||
'22 November 1977: British Airways Concorde''s first London - New York commercial flight.'
|| CHR(13) || CHR (13) ||
'8 November 1986: First round the world flight by a British Airways Concorde - covering 28,238 miles in 29 hours 59 minutes.'
|| CHR(13) || CHR (13) ||
'7 February 1996: Concorde G-BOAD crosses the Atlantic between New York and London in a new record flight time of 2 hours, 52 minutes and 59 seconds.'
|| CHR(13) || CHR (13) ||
'11 August 1999: =Two British Airways Concordes fly in supersonic formation to chase the total eclipse of the sun.';
begin
  update IMAGE_METADATA_TABLE m
     set object_value = insertChildXML
                           object_value,
                           '/imageMetadata',
                           'Description',
                           xmltype('<Description xmlns="http://xmlns.oracle.com/demo/imageMetadata">' || narrativeText || '</Description>'),
                           'xmlns="http://xmlns.oracle.com/demo/imageMetadata"'
   where m.RESID = 
           select RESID
             from RESOURCE_VIEW
            where equals_path(res,'/home/SCOTT/ImageLibrary/Concorde.jpg') = 1
end;
commit
pause
select object_value
  from IMAGE_METADATA_TABLE i, RESOURCE_VIEW r
where i.RESID = r.RESID
   and equals_path(res,'/home/SCOTT/ImageLibrary/Concorde.jpg') = 1
pause
quit