Integration Server supports the majority of the features available in XML Schema 1.0. However, Integration Server does not support the following identity-constraint definition components:

If just the internal schema parser is used when creating an IS schema from an XML Schema definition that contains the above components, Integration Server skips the above components during compilation. If the Xerces schema parser is used as well, Xerces validates the components but Integration Server skips them during compilation. In both cases, the unsupported components will not be used during validation.