The first is semantic inconsistency, a fancy way of saying that information is not structured in a standard form.

FORBES: The Web Services Dilemma

To provide answers that aren't already in Google's ever-expanding database, the company will blend new semantic-search technology with its current system to better recognize the value of information on websites and figure out which ones to show in search results.

WSJ: Google Gives Search a Refresh

Powerset, the search engine that Pell created in 2003 and plans to open to the public in 2008, is one of a new crop of "semantic search" start-ups that aim to introduce natural language to the process of finding information on the Web.

FORBES: Magazine Article