Schema Questions

hi all,

i just read the pgsql manual schema section

http://www.postgresql.org/docs/8.1/interactive/ddl-schemas.html

and i have a couple questions.

1. the first reason listed for using schemas is...

"To allow many users to use one database without
interfering with each other."

i don't quite understand this statement. does this
assume that users will be divided between schemas,
thereby reducing the load on a given schema? i'd
appreciate it if someone could clarify what is meant
here.

2. would using schemas be a good approach to separate
out public data from private data? for example, does
it make sense to create a schema for private data and
another for public data (with a different user)?

tia...

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