- Sortable tags -
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The crucial point to understand is that there is nothing special about
"cost" tag, except that it is a sortable tag. Sortable tags, unlike the
regular kind, have a name and a value, separated by a semicolon—where
the value can be a number or a string of text. When Tobu sees a
sortable tag, it inserts the value of the tag in the column under that
tag; when we're dealing with regular tags, an 'x' is inserted to
indicate that the tag is present in the record; an empty space
otherwise.
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We are not limited to just one sortable tag per item—we can have as
many as needed. In our shopping list we might have chosen to have an
additional sortable tag called "priority" and give the value of 1 for
high priority, 2 for medium and 3 for low. Let's try this right
now: click on each item, add priority tag, and hit save. You can now
sort items based on their priority, price or title. In fact, you can
sort items based on any standard tag as well—records that do not
have the tag will be sorted before the rest.
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Sortable tags will normally be sorted alphabetically if they are
textual and numerically if they are numeric. There are a few special
values that will be sorted in a different way: short month names (jul,
jan, ...), short day names (mon, tue, ...), and priority
descriptions—'low', 'medium', 'high', 'urgent'.