Link feature classes or individual features to external data stores.
If you specify a link for an entire feature class, all features in that class will use the same link definition. If you specify a different link for one feature in that feature class, that feature's link will override the feature class link setting.
If you link a feature to a map (for example, using the link string from Google Maps), you must substitute the feature's latitude/longitude properties for the ones in the string. Otherwise, the differences in the coordinate systems will result in an inaccurate location.