Keyphrases
- formal language
- visual languages
- closure properties
- grammatical inference
- databases
- xml documents
- formal languages
- context free grammars
- context free
- mildly context sensitive
- xml data
- xml files
- xml queries
- finite state automata
- interchange format
- data model
- metadata
- xml databases
- xml retrieval
- database
- parse tree
- object oriented databases
- xml schema
- expressive power
- xml format