solaris native binary ...querry

In a solaris 8 machine the native binaries
are mainly kept under /bin and /usr/bin
but some binaries i found in /usr/xpg4/bin

please can anyone tell me in a little detail what is the reason to keep the binaries in different locations

i mean /bin /usr/bin /usr/xpg4/bin

      ---whats the significance of these binary paths while building external packages on solaris-8

See answers to the other thread you started related to this. http://www.unix.com/sun-solaris/78605-significance-library-locations-solaris8-please-help.html\#post302228992