best practice use schema

Hello, What is the best practice on the use of schema ? S hould we always create a schema , or is can I use the " sys" schema by default ? Pierre Coustillas -- 1G6 52 route de bischwiller 67300 Schiltigheim Société de Services et de Formations en Logiciels Libres http://1g6.biz Tél : 06 64 63 70 35 // 09 54 38 70 90