Every reference can have one or more tags. Tag is a single word or a short phrase which can be used to group several references by one or another property.
You can also search by tag(s) using the advanced search function for this purpose there are two search fields included:
- Search for references which include given tag(s). Here you can choose if you want to search for references where all specified tags are set or for references with at least one of the specified tag set.
- Search for references which doesn't include given tag(s). In this case only references where the specified tag(s) are not present will be found.