“XML” as subscription language

• XML document is a tree

• queries are operators on this tree, express

  • sequences of elements with attributes
  • specific content, functions on content, attributes etc.

listofcities

city

city

city

publication

listofattractions

object

object

price

• express subscription with Xpath

city[name=paris]

city[language=fr]

city/*/listofattractions

object/price[val < 50]

...

...

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