Suppose Item A contains the link Item B would like to use as the source of its Droplist field. How can I achieve this? I have read the Sitecore Query documentation here and here. It appears to me that this is not achievable using Sitecore query, but I could be mistaken. Any help would be appreciated.
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No this is not possible. To set the source of a droplist, you can either set the root path to an item which would make the droplist populate the sub-items or you can use Sitecore query to query for specific items based on your query. This is covered in the Data Definition Cookbook (PDF link) under 2.4.2.