Fix <xs:all> to use MinMaxOccurs

lib/xsd/objects/all.rb

@@ -7,16 +7,7 @@ module XSD
   # extension (both simpleContent and complexContent)
   # https://www.w3schools.com/xml/el_all.asp
   class All < BaseObject
+    include MinMaxOccurs
     include ElementContainer
-
-    # Optional. Specifies the minimum number of times the element can occur. The value can be 0 or 1. Default value is 1
-    # @!attribute min_occurs
-    # @return Integer
-    property :minOccurs, :integer, default: 1
-
-    # Optional. Specifies the maximum number of times the element can occur. The value must be 1.
-    # @!attribute max_occurs
-    # @return Integer
-    property :maxOccurs, :integer, default: 1
   end
 end