Can you describe this feature in detail, how to use this in LR & make use of it to the best.
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As a quick rundown:
Create or buy a controlled vocab (google controlled vocabulary)
This will be a simple text or spreadsheet file containing a lot of keywords in a parent child structure. Format it for import into LR e.g.:
(_____ = a TAB indent)
parent1
_____child1
__________{child1synoynym1}
__________{child1synoynym2}
_____child2
__________{child2synonym1}
__________grandchild1
parent2
_____child1
__________grandchild1
_____child2
__________{child2synonym1}
Import and voila a big list of keywords and respective children and synonyms and on a basic level much easier and more consistent than thinking up keywords from scratch.
The heirarchy option (see filehandling under prerences) now in LR and Bridge provides a syntax for the keywords that sit in the metadata of your image file. This syntax can be read by an importing application (such as a future version of iView I hope, or a stock agency's search engine) which will then honour and understand the original heirarchical structure. (see Dan Hellers blog [a href=\"http://danheller.blogspot.com/2007/06/adobe-adopts-hierarchical-keywording.html]DanHeller[/url] for a very good primer on the issues)
In terms of management you can now have a master keyword text file that can be updated as you wish and then reimport into LR and Bridge to make use of it. And as far as I can tell Adobe have just leapfrogged the field with ease and manageability of keywording.