Update:Ideally what I need to achieve is, to code a callout button in the DCT, and when user click on that button, it should generate the keywords based on the overview field. (as the illustration)the process flow should be something similar to these:1.) User click on the button, check if the DCR is saved, if not prompt the user to save.2.) if DCR is saved, call meta-tagger to generate keywords for the DCR. (either formAPI or CGI callout, depends which one can be done).3.) populate the keywords into the keywords item's text field.is that possible?
This has been done at customer sites by the CSO team. In all cases we used a temp save of the file to generate the text to send to MT, then parsed it on the return into the field on the DCT as part of the DCR to be stored.
I have not tried Clark's suggestion, but it should work as well.