By default Hookmark will link with whatever src file is open in the editor window. It might make sense, depending on your workflow, to link with a whole Xcode project instead. This is more appropriate for linking to higher level resources such as design documents and issue trackers to keep them readily available while you’re working.
This is a very simple and easy change; just replace the Get Name and Get Address scripts with the following:
-- Get Address
tell application "Xcode"
get "file://" & path of active workspace document
end tell
-- Get Name
tell application "Xcode"
get name of active workspace document
end tell