考慮如下的XML.Schema示例
<xs:element name=”Price”>
<xs:complexType>
<xs:attribute name=”currency” type=”xs:string”/>
</xs:complexType>
</xs:element>
屬性currency聲明等同于下面選項(xiàng)的DTD聲明。()
A.<!ATTLISTPricecurrencyCDATA#REQUIRED>
B.<!ATTLISTPricecurrencyCDATA#FIXED>
C.<!ATTLISTPricecurrencyCDATA#IMPLIED>
D.<!ATTLISTPricecurrencyPCDATA#IMPLIED>