modifier keys in vim

Hi,
I try to map the modifier keys in vim (under X, xterm), e.g or .

However it doesn't work at all.
also neither hitting Ctrl-k nor Ctrl-v helps, this just shows in the above
example j or .

But: it works in gvim.
And: yesterday it worked also in xterm.
Today not.
XXX

Is this problem known to someone ?
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