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Comment: For HPCDATAMGM-1349: Replaced "upload" with "register" throughout.

A link in DME is a pointer to a file, similar to a UNIX soft link. If a file already exists in DME, you can create a link to it, instead of uploading registering it again. Initially, a link has the same user metadata as the source file, but you can change the user metadata of the link, or add user metadata to it. These changes are separate from metadata changes for the source file. Each link has "link_source_path" as a system metadata attribute, specifying the source file. 

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