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About schema : duplicate element definition or reference

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Could somebody tell me whether the use of duplicate element definition
or reference are permitted in XML schemas?

For example:

<complexType name="PurchaseOrderType">
<element name="shipTo" type="string"/>
<element name="shipTo" type="string"/>
<element name="billTo" type="ipo:Address"/>
<element ref="ipo:comment" minOccurs="0"/>
<element ref="ipo:comment" minOccurs="2"/>
<element name="Items" type="ipo:Items"/>
<attribute name="orderDate" type="date"/>

In XMLSpy 5.0 this schema fragment can pass the validation.
The element "shipTo" is duplicate defined, why it can pass the
And how can I distinguish the element "ipo:comment" in xml instance?
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