Keyphrases
- tree automata
- ordered trees
- regular expressions
- finite automata
- query language
- finite state
- data streams
- pattern matching
- xml documents
- query evaluation
- syntactic pattern recognition
- context free grammars
- markov chain
- tree languages
- machine learning
- xml data
- xml schema
- information retrieval
- context free
- semi structured data
- markov decision processes