How can I select an element with multiple classes with Xpath?

By padding the @class value with leading and trailing spaces, you can test for the presence of ” foo ” and ” bar ” and not worry about whether it was first, middle, or last, and any false positive hits on “food” or “barren” @class values:

/bookstore/book[contains(concat(' ',@class,' '),' foo ')
        and not(contains(concat(' ',@class,' '),' bar '))]

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