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86 The XML Files: Development of XML/XSL Applications Using WebSphere Studio
Figure 5-5 XML Schema Editor
In order to handle the contents of a schema file, you can use the Outline view to
add, remove, or rearrange components of your schema. When you select an
object in the Outline view, the Design view will display the properties that are
associated with that schema component object. you can use the Design view to
enter values for the selected object. You can switch to the Source view to edit the
schema source directly. The XML Schema editor also uses the Task view from
the workbench for errors reporting.
Using the Outline view to add schema components
The XML Schema specification defines a large number of components such as
schema, complexType, simpleType, group, annotation, include, import, element,
and attribute, etc. To create a valid schema, you must understand the
containment relationships between these components. For example, an attribute
can only be added to a complex type, but not a simple type. A group can only be
defined at the schema level, but can be referenced by a complex type, etc.
The XML Schema editor removes the burden to remember all these details for
you. You can use the Outline view to add schema components via the pop-up
menu, as shown in Figure 5-6 on page 87. The pop-up menu will only display the
list of objects that are relevant for the selected object. It will also add the object at
the correct location in the XML Schema.