I'm using the following xsl and I would like to know how do I use
multiple conditions in the same if statement.  If I pass multiple
conditions it does not return any results because if the first condition
matches and there is no match in the second condition I'm not getting
any results.  Ideally I would like not to perform the test at all if
there is no value in the $lname variable or $pubid varialbe or only use
the corresponding test if there is any value in the variables. Is there
anyway to do that?

<xsl:if test="
  ($pubid and Html/root/Publication = $pubid) or
  ($lname and Html/root[contains(AssocLawyers/a/text(), $lname)])">

          <xsl:if test ="Html/root/Publication = $pubid or
Html/root[contains(AssocLawyers/a/text(), $lname)]" >