Þessi verslunarleið var ekki eins ábatasöm og varð einungis mikilvæg þegar umrót var í vestri, eins og meðan á innrásum Almóhada stóð.
Directive #/#/EEC envisages that in order to take account of different levels of protection for the construction works at national, regional or local levels, it may be necessary to establish in the interpretative documents classes corresponding to the performance of products in respect of each essential requirementWikiMatrix WikiMatrix