1. A method comprising: receiving, by a processing device, a document comprising a first topic to be imported into a content management system; calculating a first signature of the first topic in view of content associated with the first topic; determining whether the first topic of the document is substantially similar to at least one of a plurality of topics stored in the content management system by comparing the first signature with a respective signature of the plurality of topics stored in the content management system; and in response to a determination that the first topic of the document is not substantially similar to any of the plurality of topics stored in the content management system, adding the first topic and the content associated with the first topic to the content management system.