Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Organizations (hierarchy name)
4. organizations (groups)
5. services (organizations)
6. information services

Anotations

Scope note:

Automated information services which search for, locate, and retrieve data, either directly or in the form of citations to data sources, from electronically stored databases in response to users' queries. For specifically those services which provide direct answers to users' queries, or which provide direct access to sources of the needed information, prefer "online reference services."