A complex type can contain either:
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simple content – character data or a simple type (but no elements), or
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complex content – elements or elements and character data
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Open the property sheet of a complex type and select either simple or complex in the Content list.
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Click Apply to make available the Properties tool to the right of the list.
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[optional] Click the Properties tool to open the property sheet of the content, and specify an ID and, in the case of complex content, whether the content can be mixed.
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Click OK to return to the diagram.