You can mark events or sections with distinct tags which, when combined with event filtering, lets you quickly focus in on a subset of your document.
A tag is just a word or short phrase which can be easily applied to one or more things.
For one example, you may want to tag tasks in a project plan by priority: low, medium, and high. Having done so, you can then activate the Event Filter and type #high to see only high-priority tasks, or you can type ~#low to see all tasks which aren’t tagged as low-priority (~ means not).
Tagging can be used for any other similar little bit of text you want to attach and later search for.
When one or more sections or events are selected, the Inspector now presents a “Tags” field (below Description).
To add a tag to the selected items, just start typing in that field. As you type, if any existing tags are already found in the document, a list of suggestions will show, offering quick completion; however, you are free to type in any tag you wish.
Press Return or the comma key to add the typed-in tag.
To remove a tag, just select it and press Delete.
(Note that if you select multiple events or sections with different tags, this field shows all of their tags. So if Event 1 is tagged with A and B, and Event 2 is tagged with B and C, and you select both events, the field will show A, B, and C. If you type in a new tag, it adds it to all selected events; if you delete an existing tag, it deletes it from any selected items which already have it.)
Instead of using the Tags field, you can also just type a tag directly into a title or description.
If the tag contains no spaces, punctuation, or other special characters, and doesn’t start with a digit, just prefix it with #, like a hashtag on social media. Examples include: #good, #好, and #AssignedToMe.
If you want to include spaces, you can wrap the tag in brackets: #[Assigned to Me].
Hashtags are treated exactly the same as entries in the Tags field. The main reasons to choose one or the other are:
To see tagging in action, open the Exploration of Mars example timeline (File > Open Example Document > The Exploration of Mars). This document captures the history of successful or partly-successful missions to Mars, and uses tagging to distinguish the country or agency of origin. For example, type #ESA in the Event Filter to limit display to missions managed by the European Space Agency.