query_posts and tag_slug__or

  • According to the post here it is possible to filter posts by specified tags inside a specific category with tag_slug__and

    I tried to do the same with tag_slug__or without success: all posts get listed.

    Is tag_slug__or valid?
    If no, how to define a tag pool from which at least one tag must be true to get the post listed (in a specified cat)?

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