DOCBOOK-APPS: long strings

[Tim =?iso-8859-15?q?Terleg=E5rd?= <tim@se.linux.org>]

If I have a very long string it won't be broken down to two or more lines, 
the last part just dissapears outside the paper (or pdf). I have this:

<userinput>$ snmpwalk hostname communitystring 
host.hrSWInstalled.hrSWInstalledTable.hrSWInstalledEntry.hrSWInstallName</userinput>

The last part in the last string will be cut out from the document. How 
should I solve this? I thought of SBR, but it doesn't seem to be available in 
<para> or <userinput>.

I'm using DSSSL 1.72

Thanks,

Tim