As schemas become larger, it is often desirable to divide their content among several schema documents for purposes such as ease of maintenance, reuse, and readability. XML schema defines two constructs to support this: include and import. The include element brings in definitions and declarations from the included schema into the current schema. It requires the included schema to be in the same target namespace as the including schema. The import element behaves in a similar way, with the exception that the imported schema can come from a different namespace.
In the XML schema editor, you can add an import element to an XML schema. Before you can do this, you must create an XML schema and open it in the XML schema editor (you can open an XML schema in the XML schema editor by double-clicking it).
You can add multiple import elements to an XML schema, however, prefixes and namespaces have to unique amongst the imported schemas.
An import element is always added to the top of the schema file, as it must appear as the first children of the schema element.
The following instructions were written for the Resource perspective, but they will also work in many other perspectives.
To add an import element, follow these steps:
Once you have added an import element to your XML schema, when you define new elements, attributes, complex types, or simple types where you can specify type information, any declarations from the included schema will be available in the Type list for the element, attribute, complex or simple type.
Related tasks
Adding an include element
Adding a redefine element
Related reference
XML namespaces
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