Extracting data from .xml file

By loading Google Map Markers via XML, we can import large amounts of markers while keeping our Javascript (fairly) simple and clean. If you have an XML document containing locations that you want to display on a map, you can load this XML file and display each location as a marker in Google Maps. Here's how:

Before you can use Google Maps in your own application, you'll need to get an API key. An API key is a unique series of numbers and letters that a web service provider (such as Google) can use to keep track of who is using their services. Google Maps API keys are free, and use of Google Maps is free for developers.