Abstract: Retrieving information from a database using an index of XML (eXtensible Markup Language) tags and metafiles. The index includes XML tags that correspond to domains and categories. The domains and categories are selected to facilitate searching of the database. An XML tag can have a corresponding metafile that includes XML tags for related domains and categories. The metafile can also establish a hierarchy for the tags within the metafile. Each record of the database includes an index component which lists the domain tags and category tags that are associated with the record. When a search request is received, the request is parsed to identify the terms in the request. The terms are predetermined and generally correspond to the domains and categories of the index. The terms are mapped to tags. Once the appropriate tags are identified, then the metafiles that correspond to those tags are identified. The metafiles can be used to identify additional tags that are relevant to the search.