| http://www.w3.org/ns/prov#value | - the wall is made of stone, brick, tamped earth, wood, and other materials.No, it isn't.Bungling workmen digging up a square at the foot of the wall have been blamed for triggering the disaster at Zhangjiakou, in Hebei province of northern China.Locals also say a recent deluge of rain and additional major roadworks in front of the walls may have been a factor in causing the 100ft section to fall a
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