Pekka Kilpeläinen
ABSTRACT
XML Schema uses an extension of traditional regular expressions for describing allowed contents of document elements. Iteration is described through numeric attributes <b>minOccurs</b> and <b>maxOccurs</b> attached to content-describing elements such as <b>sequence</b>, <b>choice</b>, and <b>element</b>. These numeric occurrence indicators are a challenge to standard automata-based solutions. Straightforward solutions require space that is exponential with respect to the length of the expressions.We describe a strategy to implement unambiguous content model expressions as <i>counter automata</i>, which are of linear size only.
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Index Terms
- Towards efficient implementation of XML schema content models
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