1. A computer system comprising at least one memory having stored therein computer executable components for facilitating document similarity measure and a processor that executes the computer executable components, the computer executable components comprising: a mapping component to map a suffix tree document model to a vector document model, wherein the vector document model is a vector with M elements, and M is the total number of nodes in the suffix tree document model; a weighting component to weight elements of the mapped vector document model; and a similarity component to determine the similarity between two or more weighted vector document models.