Auto Tagging tools enable content to be marked up "on the fly". Works with controlled vocabularies loaded via a Raritan Search Source, XML Data sources such as SOAP or RSS feeds and with Entity Extraction tools such as Clear Forest or UIMA to insert highlighting or hyperlinking markup into text documents.

Tagging can be applied to full text document streams and to search result metadata using the TaggingStringFilter. For result metadata, the TaggingStringFilter is enclosed in a FormattingResultRenderer / StringFilterFormatter wrapper. Full text document streams can be tagged by wrapping a TaggingStringFilter in a StringFilterDocumentContentHandler.

The auto tagging modules are divided into two main functional areas: tag sources, which retrieve data to be used to generate tagged content, and tag writers which apply the tagged information to some data stream.