The OpenCalais Web Service: Overview

The OpenCalais Web Service allows you to automatically annotate your content with rich semantic metadata, including entities such as people and companies and events and facts such as acquisitions and management changes.

The following sections describe all aspects of the OpenCalais Web Service. Additional technical information is contained in the FAQs. If you have any questions, please drop us a note.

• Preprocessed Content
• Usage Quotas
• API Invocation
• Forming API Calls
• Semantic Metadata - English
• Semantic Metadata - French
• Semantic Metadata - Spanish
• Interpreting the API Response
• RDFS
• Error Messages
• Release Notes
• FAQ - Calais API