he founders of the data extraction and API creation service Dapper announced this week that their aim is to leverage Dapper in the service of ad networks and derive a semantic index of pages around the web from that activity. They will launch their ad powering product at Ad:Tech in April. Essentially, it will perform ad funded indexing of the semantic web.

Here's how it will work: Dapper lets users identify and tag particular fields on any page. It then extracts the value in that field and makes it available in XML. As a result of this advertising activity, Dapper believes a substantial quantity of pages around the web could have fields of interest delineated and tagged with relevant terms. Relationships between pages and fields and terms and tags can all be extracted and analyzed from this aggregated activity.

The company has already built a demonstration semantic search engine based on Dapper activity and its ability to parse search results by semantic meaning and detail is