
This part of the tutorial discusses CDATA as well as XML entities, declarations and comments. As we have already said, it is a pretty good rule of thumb to consider anything outside of tags to be character data and anything inside of tags to be considered markup. But alas, in one case this is not true. In the special case of CDATA blocks, all tags and entity references are ignored by an XML processor that treats them just like any old character data.
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