You can derive an element or simple type by list to define it as a list of values of a specified data type.
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Open the property sheet of an element or simple type, and select List in the Derivation list.
For elements, the Embedded type field is set to Simple.
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Click the Properties tool to the right of the Derivation box to open the list property sheet:

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Enter an ID and a type for the list.
If you select Embedded type, the type disappears and a simple type is created in the schema within the current simple type. Click Apply, and then the Properties tool beside the Embedded type box, to define a derivation and a type for the embedded simple type.
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Click OK to close the list property sheet and return to the element or simple type.