A system includes reception of first data content, generation of a first semantic representation of the first data content, determination of whether the first semantic representation is similar to a second semantic representation of second data content, generation of a third semantic representation based on the first semantic representation and on the second semantic representation, and association of the third semantic representation with the first data content and with the second data content if the first semantic representation is similar to the second semantic representation, and association of the first semantic representation with the first data content if the first semantic representation is not similar to the second semantic representation.