Game Programming using Qt 5 Beginner's Guide - Second Edition

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The code you just wrote implements a full top-down parser of the XML data. First, the data goes through a tokenizer, which returns identifiers that are much easier to handle than strings. Then, each method can easily check whether the token it receives is an acceptable input for the current parsing stage. Based on the child token, the next parsing function is determined and the parser descends to a lower level until there is nowhere to descend to. Then, the flow goes back up one level and processes the next child. If, at any point, an unknown tag is found, it gets ignored. This approach supports a situation when a new version of software introduces new tags to the file format specification, but an old version of software ...