Mediator: XQL Engine + Persistent DOM

• XQL 98 Implementation

  • efficient recursive descent queries by signature-index

• + Joins

• + Multi Document Handling

  • extends XQL with external references (via http-get, http-post)
  • Multidocument DOM; for every node namespace and URI

• + User defined functions

  • input: context (reference-node-set, reference-node-pointer), parameters: constants, XQL-expressions (lazy evaluation)
  • output: node-functions, collection-functions (set of nodes), comparison-operatorscan attach base-URIs
  • variables

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