Don't do it with xmodmap, since that won't change the locking behaviour of CAPS LOCK. Edit $OPENWINHOME/etc/keytables/US5.kt. There are two places where keys 119 (CapsLock) and 76 (Control) should be swapped: the MODMAP section and the KEYSYMMAP section.
The latter is most important, because that's where the "Pseudo-Lock" function (which controls the locking behaviour of the key) is defined. More.
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