How can i build a java parser/interpreter

How can i build a java parser/interpreter
i know java offers a tokenizer, how can i use it for build a parser or interpreter that recognize tags like this:
<query db="db1" select="row1, row2">
and then perform some actions

how can i use it for build a parser or interpreter that recognize tags like this:A compiler design class would help understand the issues involved.
Or as suggested if you are merely trying to parse XML then there are variety of existing solutions.
Of if not XML and you already understand the principles of compiler design (formally or perhaps with experience with lexx/yacc) then you could use JavaCC
http://www.webgain.com/products/java_cc/

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