In version 2.76 of Google's Map API the GGeoXml overlay type is added. This overlay type takes a link to a KML, KMZ or GeoRSS file and displays the contents as overlays on the map, pretty much like Google Earth does. You can read about the new overlay type in the official Map API blog. The cool thing about this overlay type is that you are not limited to displaying your own KML files but. You are free to display contents from any publicly available link.
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