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Appendix: Mapping XSD to ABAP 
ABAP |
Simple XSD Data Types and Their Exact Equivalent in ABAP
XSD |
ABAP |
string (Length > 65535) |
STRING |
string (Length <= 65535) |
CHAR |
string with pattern="\d+" |
NUMC |
boolean |
Mapping to a character field of length 5 using the constants: sai_true and sai_false (Type Pool: sai) |
int |
INT4 |
short |
INT2 |
unsignedByte |
INT1 |
date |
DATS |
time |
TIMS |
decimal mit fractionDigits<=14, totalDigits<=31 |
DEC |
Binary (length <= 65535) |
RAW |
Binary (length <= 65535) |
RAWSTRING |
Tags Supported for Complex Data Types (in Alphabetical Order)
XSD |
Corresponding type in ABAP Dictionary |
<attribute> (local) |
Field of a structure |
<complexType> (global) |
Structure |
<complexType> (local) |
Structure |
<element maxOccurs="unbounded"> |
Field of a structure and a table type |
<attribute> (local) |
Field of a structure |

XSD Editor are listed.
Limitations for XSD Elements
XSD Element |
Note |
<extension> |
These elements cannot be converted. |
substitutionGroup
|
|
<redefine> |
|
Limitation of
value range |
These tags are not taken into consideration by the proxy runtime; checking these properties is part of the task for validating the schema. |
Key relationships, uniqueness (<key>, <keyref>, <unique>, and so on) |

For more information about the language elements in the XML schema supported by ABAP proxy generation, see SAP Service Marketplace at service.sap.com/xi ® Media Library ® Documentation: SAP XI 3.0 (SP11) – Supported XML Schema and WSDL (EN). The restrictions listed apply not only to WSDL documents from the Integration Repository but also to WSDL documents from other sources.