XML Query Requirements WD
- XML Query Functionality
- Operators on all data types
- Text operators across element boundaries
- Support for hierarchy and sequence
- Ability to combine data from different locs
- Aggregation and sorting
- Combination of operators including queries as operands
- Support for NULL/empty values
- Structural preservations
- Identity preservation
- Operations on names
- Operations on “schemas”
- Extensibility
- Closure
