  Temporal text, i.e., time-stamped text data are found abundantly in a variety
of data sources like newspapers, blogs and social media posts. While today's
data management systems provide facilities for searching full-text data, they
do not provide any simple primitives for performing analytical operations with
text. This paper proposes the temporal term histograms (TTH) as an intermediate
primitive that can be used for analytical tasks. We propose an algebra, with
operators and equivalence rules for TTH and present a reference implementation
on a relational database system.
