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The purpose of this appendix is to introduce you to XML. A knowledge of XML is essential if you wish to write SVG documents directly rather than having them generated by some graphics utility.
If you're already acquainted with XML, you don't need to read this appendix. If not, read on. The general overview of XML given in this appendix should be more than sufficient to enable you to work with the SVG documents that you will create. For further information about XML, the O'Reilly books, Learning XML by Erik T. Ray and XML in a Nutshell by Elliotte Rusty Harold and W. Scott Means, are invaluable guides, as is the weekly online magazine XML.com.