The definition of the boundaries of the Spanish "Route of Santiago de Compostela" site was from the start and, as far as I am aware, still is, a "mess!!
This is the essence of the issue "the Route of Santiago WHC Nomination Documentation (UNESCO, 1993) indicates that the protected historical complex includes 30 meters to each side of the route and all the medieval areas of cities and towns crossed by it. Suarez-Inclan (2000) underlines that this protection was established with a temporal character and that the final delimitation was to be determined by planning instruments. Buffer zones should be formally indicated in a revised version of the UNESCO dossier for the Route of Santiago"
I am unable definitively to determine what "established with a temporal character"
really means in English!! Apparently it could mean "temporarily until something better was worked out"
Have a look at http://www.law.kyushu-u.ac.jp/programsinenglish/hiroshima/martorell.pdf
Search on "Compostela" to find the relevant case study - there are no page numbers. The 3rd "find" is the relevant one.
Also this download address
I have so far been unable to discover
a. The original nomination file. This is shame as it would throw some light on matters. The first document above states "For example, it has been determined that some of the towns formally included in the nomination dossier are not located on the historical route. On the other hand, some towns that were located on the historical path to Santiago were not included in the dossier (Martorell, 2005)."
b. The relevant "Retrospective Inventory". Its reference is apparently WHC/74/Esp/PST - but I can't (as yet) find it! A quote about it shows some of the issues - "The excerpt from the Inventory Forms concerning the Route of Santiago in Spain indicates that the specific problem identified in the case of the Route is related to the 1800 separate structures associated with the route, although not necessarily on the route or within the boundaries identified by the 1:50,000-scale maps or village plans included in the dossier for the route itself. The only locational information provided for these structures is the name of the municipality. It is not currently possible to know whether these separate structures are within the linear route, much less to map the properties or to know their precise size."
A final quote from the first document above"Regional governments have taken on the task of defining the path of the Route of Santiago in the territories of the Autonomous Communities that is crosses. Delimitation documents have been definitively approved in Navarre, La Rioja, Castile-Leon and Galicia. In Aragon the delimitation is still under discussion. Those documents do not necessarily contain the same route as the one included in the WH dossier."
Please let us know if you track down anything further!!!