Methods and apparatus, including computer program products, for mapping deep structured data structures. Statements defining a mapping of source elements formatted in accordance with a first hierarchical structure to a target formatted in accordance with a second hierarchical structure are received. The first and second hierarchical structures may be different. A mapping of the source elements to the target in accordance with the statements may be performed, where the statement may be defined in accordance with a mapping language. The mapping language may define that a single statement may represent an iterative approach to mapping elements from the source to the target. The mapping language may support selection of source elements using a format that allows for navigation through a hierarchy of the source. The mapping language may also support nested statements which may allow for nested iterations in which to perform mappings.
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