Open Calais Blog

Open Calais – What’s in it for me?

Open Calais metadata: – Helps me find what I am looking for – Helps consistently combine my firm’s content with 3rd party content into a meaningful view – Enables me to build intelligent alerting on topics and entities I am interested – Is used to generate a view of – what’s trending now. What seems […]

Glossary of Semantic Technology Terms

Here is a useful glossary of semantic web terms. It provides basic definitions for common terms. Open Calais uses quite a few technologies mentioned here like RDF, entity, Geonames, Natural Language Processing, ontology, OWL. I also enables capabilities  like RDFa, SPARQL, and more. Enjoy. Ofer Harari

Open Calais PermID and DBPedia IDs

I have been asked by one of our users what is the relationship between PermID and DBpedia IDs. The answer is – there is no one to one mapping that we provide. However I proposed the following options: The metadata types called SocialTags are links to Wikipedia. So you can take a SocialTag and use […]

Latest updates (release 9.0)

Have you used the new option to submit PDF to the online viewer? You can use now the option to remove the original text from Open Calais’s response. Look for omitOutputtingOriginalText in the documentation. We are adding optimizations for Broker Research reports. Try broker research report documents and let us know any feedback you have […]

Questions and forums Please use this developers link to post questions about Open Calais. We’ll do our best to respond. Thank you.

The Python Library for the CalaisModel Abstraction Layer is Available!

The CalaisModel Abstraction Layer package now includes a Python library, in addition to the Java and .NET libraries. The CalaisModel Abstraction Layer provides a client API that maps RDF/XML entities to Java objects. The package includes the CalaisModelCreator, a tool used to automatically generate an instance of the CalaisModel, populated with your data. This instance […]

Develop a New Drupal Module, Get a Basic Package for FREE for One Year

As you know, there are several third-party solutions which leverage Calais and make its capabilities even better. A Drupal module, which integrates the powers of the Calais Web Service with Drupal, is one of them. This solution integrates the semantic meta-tagging of content through Calais. Unfortunately, with the introduction of our new and improved API […]

Introducing the Tagaroo Plugin

Tagaroo is a WordPress plugin gives you an integration between your WordPress blog and the Calais web service. It leverages the Calais web service to fetch semantic data and return that data as suggested tags. We think it is a great way for bloggers to leverage Calais and we invite you to give it a […]


This is a reminder that the legacy Open Calais API will be retired tomorrow, September 30, 2015 in favor of a new and improved service. The new and improved service offers many advantages, such as enhanced through-put and metadata capabilities. The new service is not fully backward compatible with the legacy Open Calais and will […]