Research Article
Pipelined XPath Query Based on Cost Optimization
| Expression name | Syntax |
| Path expression | Path::= Step(‘/’ Step) | Query step | Step:: = Axis Tag | Axis Tag ‘[’ Pred ‘]’ | Axis | Axis::= PA | CH | AN | DS | AT | PS | FS | PP | FF | Tag for node test | Tag::= String | | Predicate | Pred::= Path | Pred ‘or’ Pred | Pred ‘and’ Pred | ‘not’ ‘(’ Pred ‘)’ | Num |
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