You define mapping collections of value type as follows:
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Create an entity type class.
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Create another class for value type.
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Open the property sheet of the class, click the Detail tab, and select the Value type radio button.
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Create an association between the value type class and an entity type class. On the value type side, set the multiplicity to one and the navigability to true.

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Generate the PDM with O/R mapping.
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Open the property sheet of the entity class and click the Preview tab.
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Verify the mapping file.
A composite entity class may contain components, using the <nested-composite-element> declaration.