All targets of forward hierarchical Referencesfrom a TypeDefinitionNodeshall have a BrowseNamethat is unique within the TypeDefinitionNode. The same restriction applies to the targets of forward hierarchical Referencesfrom any InstanceDeclaration. This means that any InstanceDeclarationwithin the InstanceDeclarationHierarchycan be uniquely identified by a sequence of BrowseNames. This sequence of BrowseNamesis called a BrowsePath.