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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. Using the IntelliScript Editor
  7. XMap
  8. Libraries
  9. Schema Object
  10. Command Line Interface
  11. Scripts
  12. Parsers
  13. Script Ports
  14. Document Processors
  15. Formats
  16. Data Holders
  17. Anchors
  18. Transformers
  19. Actions
  20. Serializers
  21. Mappers
  22. Locators, Keys, and Indexing
  23. Streamers
  24. Validators, Notifications, and Failure Handling
  25. Validation Rules
  26. Custom Script Components

XPath Predicates Reference

XPath Predicates Reference

XPath predicates find a matching node or sequence of nodes in a hierarchical document. A predicate expression defines the value of an Input, Condition, or Output field of a mapping statement. The XPath expression determines the context in which a mapping statement is run.
Use the following XPath expressions in predicates to select a node or sequence of nodes:
ancestor
Selects all ancestors, such as parent or grandparent, of the current node. For example, the predicate expression "ancestor::book" selects all book ancestors of the current node.
ancestor-or-self
Selects all ancestors, such as parent or grandparent, of the current node, as well as the current node. For example, the predicate expression "ancestor-or-self::book" selects all book ancestors of the current node, and the current node also.
attribute
Selects all attributes of the current node. For example, the predicate expression "attribute::lang" selects the lang attribute of the current node.
child
Selects all children of the current node. For example, the predicate expression "child::book" selects all book nodes that are children of the current node.
descendant
Selects all descendants, such as children or grandchildren, of the current node. For example, the predicate expression "descendant::book" selects all book descendants of the current node.
descendant-or-self
Selects all descendants, such as children or grandchildren, of the current node, as well as the current node. For example, the predicate expression "descendant-or-self::book" selects all book descendants of the current node, and the current node as well if it is a book node.
following
Selects everything in the document after the closing tag of the current node. For example, the predicate expression "following::book" selects everything in the document after the closing tag of the book node.
following-sibling
Selects all siblings following after the current node. For example, the predicate expression "following-sibling::book" selects all the siblings in the document after the book node.
namespace
Selects all namespace nodes of the current node.
parent
Selects the parent of the current node. For example, the predicate expression "parent::book" selects the lang attribute of the current node.
preceding
Selects all nodes that appear before the current node in the document, except ancestors, attribute nodes and namespace nodes. For example, the predicate expression "preceding::book" selects the nodes before the book node.
preceding-sibling
Selects all siblings that appear before the current node in the document. For example, the predicate expression "preceding-sibling::book" selects the sibling nodes before the book node.
self
Selects the current node. For example, the predicate expression "self::book" selects the current book node.