# File lib/scrubyt/core/scraping/pattern.rb, line 124
    def generate_relative_XPaths(parent_xpaths)
      return if type != :tree
      raise ArgumentError.new if parent_xpaths.size != 1 && parent_xpaths.size != @filters.size #TODO: should be checked earlier with proper error message
      @filters.each_index do |index|
        @filters[index].generate_relative_XPath parent_xpaths[parent_xpaths.size == 1 ? 0 : index]
      end
    end