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YnXGdd�dej �Z Gdd�dej!�Z"dd�Z#dS)a� A SAX2 driver for libxml2, on top of it's XmlReader API

USAGE
    # put this file (drv_libxml2.py) in PYTHONPATH
    import xml.sax
    reader = xml.sax.make_parser(["drv_libxml2"])
    # ...and the rest is standard python sax.

CAVEATS
    - Lexical handlers are supported, except for start/endEntity
      (waiting for XmlReader.ResolveEntity) and start/endDTD
    - Error callbacks are not exactly synchronous, they tend
      to be invoked before the corresponding content callback,
      because the underlying reader interface parses
      data by chunks of 512 bytes
    
TODO
    - search for TODO
    - some ErrorHandler events (warning)
    - some ContentHandler events (setDocumentLocator, skippedEntity)
    - EntityResolver (using libxml2.?)
    - DTDHandler (if/when libxml2 exposes such node types)
    - DeclHandler (if/when libxml2 exposes such node types)
    - property_xml_string?
    - feature_string_interning?
    - Incremental parser
    - additional performance tuning:
      - one might cache callbacks to avoid some name lookups
      - one might implement a smarter way to pass attributes to startElement
        (some kind of lazy evaluation?)
      - there might be room for improvement in start/endPrefixMapping
      - other?

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