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[xsl] simplify XPath expression

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hi,
i was thinking the following xpath could be simplified as it has redundant infos. but somehow i cannot bring this to work:

combilist/item/head[1][not(../date)]
[not(../image) and count(../description)=1]					|
combilist/item/head[2][not(../price)]
[not(../image) and count(../description)=1]

the second line in each member of the above union is the same so i think it must be possible to combine these. i tried

(
	combilist/item/head[1][not(../date)]
	|
	combilist/item/head[2][not(../price)]
)
[not(../image) and count(../description)=1]

but this does not work...

thanks for any suggestions.
chris

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