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"Semantic Search on Linked Data Here you can search across more than 30 million resources contained in the thousands of semantically enriched Open Access Document Repositories and  Data Repositories included in the CHAIN Knowledge Base. Search results are ranked according to the Ranking Web or Repositories. Some exemplar keywords are: cardiology, cell, cornea, geology, linked data, natural gas."

"CTSAsearch is a federated search engine using Linked Open Data published by members of the CTSA Consortium and other interested parties. To try it out, use the form below or click on the "CTSA Search" entry in the menu on the left to see a ranked list of matching investigators. Check the "Display Map" box or click on the "CTSA Map" entry in the menu to visualize coauthorship amongst the matching investigators."

'Semantic Web search engines are applications for finding ontologies that require reasonable effort: queries are usually written as natural language keywords and results are ranked. Some additional information is often provided.'