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Items in the list are accessed on the basis of an ordinal index . " This is accomplished by invoking the method named item on the NamedNodeMap object , passing an ordinal index as a parameter . I will use an ordinal index in this program , as shown in Listing 18 . " Therefore , references to objects representing attribute nodes can be accessed in a NamedNodeMap object either on the basis of the attribute name , or on the basis of an ordinal index . He is able also to call some user defined functions like pre-defined indexes or native methods . A visual index system assists the viewer in relocating information within the tape . " The code in Listing 28 takes advantage of the fact that " Objects contained in an object implementing NamedNodeMap may also be accessed by an ordinal index , ... See Thesaurus of psychological index terms for subject headings used in PsycINFO .