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It is able to add line-breaks, indentation, sorts attributes, convert tag cases and wraps long comments. It recognizes tags, character data, comments, XML declarations, processing instructions and external entities and is able to format these tokens nicely.
The document is split into these tokens using the XML_Beautifier_Tokenizer class and the expat parser. Then a renderer is used to create the string representation of the document and formats it using the specified options.
Currently only one renderer is available, but as XML_Beautifier uses a driver-based architecture, other renderers (like syntax-highlighting) will follow soon.