Open Issues

• Combination with relational algebra

• Graphs/Multidocuments

  • DAGs: Multiple paths from root-context to node (serialization?)
  • Role of URIs in locators?

• Typing

  • Role of XSD (XML Schema Description)
  • Inference

• Constructors

  • attribute to element and vice versa….
  • Grouping, Skolems

• Details

  • Investigate conformance of locator concept to W3C Infoset
  • Constraints on locators/mappings to guarantee wellformedness

• Political

  • XQL-Implementations shipping:underlying semantics node-based, not locator-based

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