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By default, tags are added to the default Grails namespace and are used with the `g:` prefix in GSP pages. However, you can specify a different namespace by adding a static property to your `TagLib` class:

[source,groovy]
----
class SimpleTagLib {
    static namespace = "my"

    def example(Map attrs) {
        out << attrs.name
    }
}
----

Here we have specified a `namespace` of `my` and hence the tags in this tag lib must then be referenced from GSP pages like this:

[source,xml]
----
<my:example name="..." />
----

where the prefix is the same as the value of the static `namespace` property. Namespaces are particularly useful for plugins.

Tags within namespaces can be invoked as methods using the namespace as a prefix to the method call:

[source,groovy]
----
out << my.example(name:"foo")
----

This works from GSP, controllers or tag libraries
