bikeidentifies the link as a Bike link. The second part,
dnyzqSRa, is the id of the linked to outline. The third part,
Ir, is the id of the linked to row. A nice feature of these links is that they won't break when you edit your outline or rename your outline file.
Shift-Command-Cto copy a link to the selected row.
Controlkey before releasing the mouse. A link to the dragged row will be inserted into your outline.
com.apple.metadata:kMDItemIdentifierextended file attribute each time Bike saves a file. This means if a file's extended attributes are somehow lost then links to that file will break until next time the file is opened and saved through Bike.