Runtime Instance Validation Against Structure Definitions - 6.3

Talend Data Mapper User Guide

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Structure validation is the act of checking the values of an instance document against the element specifications defined by the structure, such as checking that the number of characters inside of an element does not exceed its size constraints. Custom validation checks are possible using the validation expression.

Because the additional checks associated with structure validation can add significant processing time, especially in large structures, structure validation is turned off by default. You can use the preferences to enable structure validation.