Sybase PowerDesigner XML User Manual page 21

XSM User's Guide
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Caution
A group particle (sequence, choice, all) cannot be created from scratch in
a diagram.
It must be the child element of an element, a group or a complex type.
For more information, see sections How to link a child object to an
element, How to link a child object to a group particle, How to link a child
object to a group of elements, How to link a child object to a complex type,
in chapter Building an XML model.
Chapter 1 XML Model Basics
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