Sybase PowerDesigner XML User Manual page 34

Defining an XML model
Model Namespaces page
22
A namespace is a URI indicating a location where objects are declared. The
prefix of a namespace, followed by a colon (:) and the name of an object,
indicates that this object is declared in that namespace. Namespaces are not
supported by DTDs.
You can use the following tools to attach namespaces from other models or
schema files to the current model:
Tool Tooltip
Add Namespaces
from XML Models
Add Namespaces
from XML schema
files
In the case of a model targeted with XSD, the namespace of the W3C
XML Schema Recommendation is predefined in the list of namespaces.
Description
Adds namespaces of other XML models. These
are source namespaces for the current model
Adds namespaces of other schema files
available on your machine. These are source
namespaces for the current model
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