Locates Nameloc elements, which in turn locates the actual anchors.
Used to locate Nameloc elements, through their ID-attributes.The content of this element must be identical to the values of the located nameloc elements' ID-attributes. At least one ID is required as content. ID's are separated with a comma or blanks. Referenced nameloc elements must recide in the same instance as this element, or in module named in attribute "docorsub".
For further explanations, see the HyTime standard (ISO 10744), clause 8.3.2.2.