1.
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I
have reviewed this quarterly report on Form 10-Q/A of XOMA
Ltd.;
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2.
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Based
on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this
report.
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Date: September
11, 2008
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/s/ STEVEN B.
ENGLE
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Steven
B. Engle
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Chairman,
Chief Executive Officer and
President
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