In Reader the user can swipe two fingers horizontally to flip the document (or cmd-i) to get the universal citation dialog at the back of the document which is now editable. Changing any information here updates the Visual-Meta, so this is here a user can fix an error, as well as apply tags and add notes.
The ‘Variable Button’ in this dialog (please note that this dialog is exactly the same as the Universal Citation Dialog used elsewhere, just without being a dialog, being the whole back of the document, plus the Tags and Notes fields underneath) will be ‘Edit Citation’. Clicking this will change the view to that shown in ‘Edit Citation’ below.
Notice how the last sentence from the Abstract has two line breaks before it. The abstract should be from the visual meta or from Scholarcy.
The tags are the same tags as are with the document in the Finder, and is assigned in exactly the same interaction as the ‘Tags’ dialog in the ‘Get Info’ dialog, including click to see current tags and the ability to type new tags:
If the user clicks ‘Edit Citation’ then the dialog opens to this view, which is exactly the same as the Universal Citation Dialog Edit mode, and hides the Tags and Notes. The ‘Variable Button’ will be ‘Delete Citation Information’, which, on clicking will produce a warning ‘Are you sure you want to permanently delete all the Visual-Meta citation Information?’.