Sybase PowerDesigner XML User Manual page 90

Defining groups
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Referencing groups are created in a diagram within an element, a
complex type or a global group. You must select a global group for their
Reference property (See the following table)
Groups in DTD and XDR files
In a model targeted with DTD or XDR language, there are no global or
referencing groups, although they appear on the diagram.
Groups are expanded within their parent element and their child elements
are declared individually as global elements. (See generated DTD and
XDR files in Defining a group of elements)
To display a group property sheet, double-click its symbol in a diagram.
The General page of a group property sheet displays the following properties:
Property Description
Name Name of the group. It must be a no-colon-name (See Glossary).
Required when the group is global
Code Code of the group. It must be a no-colon-name. Required when
the group is global
Comment Descriptive label for the group
Stereotype Sub-classification used to extend the semantics of an object
without changing its structure. It can be predefined or user-
defined
Reference Name of a group in the current model or another model opened in
the workspace. It must be a qualified name (See Glossary). A
reference allows you to reuse a group with all its properties
without having to define it again. Use the dropdown listbox to
select a group in the current model. Use the Browse tool to select
a group from any model opened in the workspace. If you select a
group from another model, a shortcut is created with the
referencing group. When a reference is defined, the name and
code properties are grayed. The name and code are those of the
target group
Group type Indicator that specifies how child elements are to be used within
the group. Select a group particle (all, choice or sequence)
Minimum Minimum number of times the group can occur. To specify that
the group is optional, set this attribute to zero
Maximum Maximum number of times the group can occur. For an unlimited
number of times, select unbounded
ID ID of the group. Its value must be of type ID and unique within
the model containing this group
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