Sybase PowerDesigner XML User Manual page 52

Defining elements
Element detail properties
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Example of an XDR file:
The Detail page of an element property sheet displays the following
properties:
Property Description
Minimum Minimum number of times the element can occur. To
specify that the element is optional, set this attribute to zero
Maximum Maximum number of times the element can occur. For an
unlimited number of times, select unbounded
Substitution group Name of a global element for which the current element can
be substituted. It must have the same type or a derived type.
Its value must be a qualified name (See Glossary)
Default Default value of the element if its content is a simple type
or text-only. Enter a default value only if there is no fixed
value
Fixed Predetermined, unchangeable value of the element if its
content is a simple type or text-only. Enter a fixed value
only if there is no default value
Block Property to prevent another element with the same type of
derivation from being used in place of the current element
Final Property to prevent derivation of the current element.
Prohibited if the element is not a global element
Form Form of the element. Used to specify the target namespace
of the element. If you select Qualified, a namespace prefix
is required to qualify the element. If you select
Unqualified, a namespace prefix is not required to qualify
the element
ID ID of the element. Its value must be of type ID and unique
within the model containing the element
Abstract Property defining if the element can appear in the instance
document or not. If selected, the element cannot appear in
the instance document
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