The Zorba XQuery Processor

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Zorba is a general purpose XQuery processor implementing in C++ the W3C family of specifications. It is not an XML database. The query processor has been designed to be embeddable in a variety of environments such as other programming languages extended with XML processing capabilities, browsers, database servers, XML message dispatchers, or smartphones. Its architecture employes a modular design, which allows customizing the Zorba query processor to the environment’s needs. In particular the architecture of the query processor allows a pluggable XML store (e.g. main memory, DOM stores, persistent disk-based large stores, S3 stores). Zorba runs on most platforms and is available under the Apache license v2.

The following functionalities are implemented:

• XQuery 1.0 and XPath 2.0 (as in the W3C recommendation) with only limited support for schema validation.
• XQuery Update Facility 1.0 (as in the evolving W3C recommendation).
• An in-memory replaceable XML store implementing the XQuery Data Model (XDM) W3C recommendation.
• Group By (as in the evolving W3C XQuery 1.1 recommendation).
• Try-Catch (as in the evolving W3C recommendation).
• Eval Facility to dynamically evaluate a string and execute it as a query.
• APIs in various programming languages (i.e. C++, C, Python, and Ruby).
• Basic schema validation (without post schema validation and substitution groups).

• The User Guide
  • Build Instructions
  • Installation
  • Feature Description
    • Group By - XQuery 1.1
    • General FLWOR - XQuery 1.1
    • Try-Catch
    • Eval
    • REST
    • Additional Function Libraries
      • node-reference() and node-by-reference()
      • Math functions
      • Input and Output
      • The "Zorba util" functions
  • The Zorba Command Line Utility
  • Debugger
  • Application Programming Interfaces (APIs)
    • C++ API
    • C API
    • Python API
    • Ruby API
    • PHP API
  • MS DOM Store