[xmlblaster] =?gb2312?B?aG93IGNhbiBpIGJlIHB1Ymxpc2hlciBhbmQgc3Vic2NyaWJlciB0byBkaWZmZXJ0IHhtbGJsYXN0ZXIgaW5zdGFuY2U=?=

[zhang]

how can one client be subscriber of one xmlBlaster instance and
     publisher of another xmlBlaster instance?

I think client must specify their xmlBlaster instance at startup.