[XSLT]des condition dans xsl

bonjour

comment on peut utiliser des "and" et "or" dans des conditions de xsl??

Code:

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<xsl:if test="plusieurs conditions">

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j'ai trouvé cette explication dans le site de W3C...

Citation:

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Booleans

An object of type boolean can have one of two values, true and false.

An or expression is evaluated by evaluating each operand and converting its value to a boolean as if by a call to the boolean function. The result is true if either value is true and false otherwise. The right operand is not evaluated if the left operand evaluates to true.

An and expression is evaluated by evaluating each operand and converting its value to a boolean as if by a call to the boolean function. The result is true if both values are true and false otherwise. The right operand is not evaluated if the left operand evaluates to false.

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mais je ne comprends toujours pas comment faire

Code:

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test=" 'test1'!='test2' and 'test3'!='test4' "

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