How do I create a java map from xsd

Hi experts,

I am trying to use xsd to create java class. For example I have class A as followings:

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<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.xxx.com/AAA/entities"
    targetNamespace="http://www.xxx.com/AAA/entities" elementFormDefault="qualified">

    <xs:element name="classA">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="namer" />
                <xs:element ref="value />
                <xs:element ref="myMap" type="xs:string" maxOccurs="unbounded" /> ---> line 00
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

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 How do I modify line 00 so that I can have a hash map in my class? Thanks!