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Hi Folks, I dug out my old compiler "Dragon book" and started rereading it. Chapter 1 lists some of the tools that employ compiler techniques. This one caught my attention: Query interpreters: A query interpreter translates a predicate containing relational and boolean operators into commands to search a database of records satisfying that predicate. An XPath expression is a query. Not against a database, but against an XML document. Are XPath expressions parsed using compiler parsing algorithms? Is a syntax tree constructed for an XPath expression? Is the syntax tree traversed? /Roger
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