SRO meaning in Regional ?

Campidanese Sardinian (Sardinian: sardu campidanesu, Italian: sardo campidanese) is one of the two written standards of the Sardinian language, which is often considered one of the most, if not the most conservative of all the Romance languages. The orthography is based on the spoken dialects of central southern Sardinia, identified by certain attributes which are not found, or found to a lesser degree, among the Sardinian dialects centered on the other written form, Logudorese. Its ISO 639-3 code is sro.

Traditionally the name Campidanu (Campidano in Italian) refers to the fertile area located around the towns of Guspini and Villacidro. Campidanese dialects can be found across the entire Province of Cagliari and not just the Province of Medio Campidano area. Campidanese also extends into parts of the Province of Nuoro, notably the Ogliastra area and in the southern half of the Province of Oristano, the capital included. However, it is at this point that the dialects merge into Logudorese.