The description field in the WWWAnchor allows for a friendly prompt to be displayed as an alternative to the URL in the name field.
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Ideally, browsers will allow the user to choose the description, the URL or both to be displayed for a candidate WWWAnchor.
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The WWWAnchor's map field is an enumerated value that can be either NONE(the default) or POINT.
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If it is POINT then the object-space coordinates of the point on the object the user chose will be added to the URL in the name field, with the syntax "?x,y,z".
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