DSIS (Sistema de Indización de Estructura Profunda)

= Deep Structure Indexing System (DSIS), DISI (Deep Structure Indexing System).

Ex. Deep Structure Indexing System (DSIS) is a version of POPSI (Postulate-based Permuted Subject Indexing).

Ex. The most recent version of computerised POPSI is known as Deep Structure Indexing System (DSIS).