Uche Ogbuji discusses Python dictionaries and SAX on O'Reilly. "My pet description of XML's fundamental data model is "labeled strings in nested packages". The labeling and nesting are what differentiate XML from good old comma or tab-delimited value and tabular ("square") data models such as spreadsheets and classic SQL databases. This same labeling and nesting makes for a natural accommodation of data from XML in Python dictionaries."

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