Table of Contents

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  1. Preface
  2. Introduction to Data Transformation
  3. Data Processor Transformation
  4. Wizard Input and Output Formats
  5. Relational Input and Output
  6. XMap
  7. Libraries
  8. Schema Object
  9. Command Line Interface
  10. Scripts
  11. Parsers
  12. Script Ports
  13. Document Processors
  14. Formats
  15. Data Holders
  16. Anchors
  17. Transformers
  18. Actions
  19. Serializers
  20. Mappers
  21. Locators, Keys, and Indexing
  22. Streamers
  23. Validators, Notifications, and Failure Handling
  24. Validation Rules
  25. Custom Script Components

Data Transformation User Guide

Data Transformation User Guide

Predicates

Predicates

A predicate is an expression that you configure to find a node in a hierarchical document. You can configure the expression to find a specific value. Create a predicate in an Input, Condition, or Output field of a mapping statement.
When you define a predicate, enclose the expression in square brackets [ ] after the node.
/<node>[expression]
For example, the following expression selects the book elements that are children of bookstore and have a price element with a value greater than 55.00:
/bookstore/book[price>55.00]
The following expression selects the title elements of the book elements that are children of bookstore with a price element value greater than 55.00:
/bookstore/book[price>55.00]/title
The following expression selects the title elements that have an attribute lang with a value of "eng":
//title[@lang="eng"]
The Data Processor transformation cannot accept all XPath statements in the Output field when you configure a mapping statement with the Add mode or the Match or Add mode.