December 2015
Intermediate to advanced
762 pages
19h 13m
English
Content preview from XQuery, 2nd Edition
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Chapter 25. Implementation-Specific Features
XQuery can be used for a wide variety of XML processing needs. As such, different XQuery implementations provide customized functions and settings for specific use cases. This chapter looks at some of the implementation-specific aspects of XQuery.
Conformance
The XQuery specification consists of a core set of features that all implementations are required to support. Supporting these features is known as minimal conformance. In addition, there are a handful of optional features that are clearly defined and scoped. These optional features are listed in Table 25-1.
| Feature | Description | Chapter/Section |
|---|---|---|
| Module | Support for library modules and module imports | “Assembling Queries from Multiple Modules” |
| Schema Aware | Support for schema imports in the prolog and validate expressions | Chapter 14 |
| Typed Data | Support for typed element and attribute nodes | Chapter 14 |
| Static Typing | Detection of all static type errors in the analysis phase | Chapter 15 |
| Higher-Order Function | Support for function items, inline function expressions, and dynamic function calls | Chapter 23 |
| Serialization | Ability to serialize query results | “Serializing Output” |
In addition to these seven features, some aspects of the core language are either implementation-dependent or implementation-defined. Implementation-defined features are those where the implementer is required to document the choices she has made. For example, the list of supported collations or additional built-in ...
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