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Google Visualization API Essentials by Traci L. Ruthkoski

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Architecture and data modification

Before an external data source can be visualized in a chart, a translation from the data source format to a Visualization API-compatible format must be performed. The Visualization API does not directly handle the modification of the values stored in the dataset itself. The intention is not to be a data management tool, instead, the API environment provides a handful of programmatic methods to load selected data into the application. Once in a format it can understand, the Visualization API can manipulate any aspect of the data structure and content. In this way, the Visualization API is able to store initial data and any permutations for visualization purposes, but not become a tool for data source management. ...

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