2 - Policies Regarding CREDIBILITY of the World Heritage List
2.7 - Types of World Heritage properties
2.7.3 - Serial properties
“Serial properties will include two or more component parts related by clearly defined links:
a) Component parts should reflect cultural, social or functional links over time that provide, where relevant, landscape, ecological, evolutionary or habitat connectivity.
b) Each component part should contribute to the Outstanding Universal Value of the property as a whole in a substantial, scientific, readily defined and discernible way, and may include, inter alia, intangible attributes. The resulting Outstanding Universal Value should be easily understood and communicated.
c) Consistently, and in order to avoid an excessive fragmentation of component parts, the process of nomination of the property, including the selection of the component parts, should take fully into account the overall manageability and coherence of the property (see paragraph 114).
and provided it is the series as a whole – and not necessarily the individual parts of it – which are of Outstanding Universal Value.”