The AtoZ provides a pluggable letter paginated listing of topics and optionally items with a topic com.arsdigita.london.atoz.ui.AtoZPane This type is a base for an element containing child entries, either topics or items. . A provider is a module which generates A-Z entries. A category provider may generate a list of items corresponding to navigation categories. An atomic entry is a leaf-node in the A-Z, representing a single item (or page of content) in the A-Z. As such it has a URL pointing to the location of the item. A compound entry can be thought of as a topic, with a title and description. It will contain a number of child entries, representing either sub-topics or items.