UI's for building queries or classification rules from XML trees

Do you know UI's for building "rules" or queries from a XML tree? In my application I need the user to:
  • Select a XML node from a subset of a huge XML tree
  • Select a condition (=,<,>,etc)
  • Select or write valid value(s)
  • Add the rule
since it will be part of a classifier, the constructed rule will be stored for later edition, removal, etc. My users do not want to write/learn in any programming language.I'm working in Smalltalk but if you may show examples in any other programming language it will be appreciated too.
 
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