# File lib/scrubyt/core/scraping/filters/base_filter.rb, line 80
    def initialize(parent_pattern, example)
      case parent_pattern.example_type
      when :xpath
        @example_type = EXAMPLE_TYPE_XPATH        
      else
        @example_type = BaseFilter.determine_example_type(example)
      end        
      @parent_pattern = parent_pattern
      @example = example
      @xpath = nil                #The xpath to evaluate this filter
      @constraints = [] #list of constraints
    end