JAXB beta optional attributes

I am evaluating JAXB beta release and I am wondering how to tell if an optional attribute was specified in the document. In particular, my attribute is of type xsd:int. The Impl class has a "protected boolean has_XXXXX" field, but I don't see a public method for accessing this value.
Hopefully, I am missing something obvious.
Thanks in advance.

Bhakti,
Thanks for your response. Here is the beginning of my xsd:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
jxb:version="1.0">
<xsd:annotation>
<xsd:appinfo>
<jxb:globalBindings
fixedAttributeAsConstantProperty="true"
collectionType="java.util.ArrayList"
typesafeEnumBase="xsd:NCName"
     choiceContentProperty="false"
     typesafeEnumMemberName="generateError"
     modelGroupAsClass="false"
     enableFailFastCheck="false"
     generateIsSetMethod="true"
underscoreBinding="asCharInWord"/>
<jxb:schemaBindings>
     <jxb:package name="com.limesoft.report.dictionaryxml"/>
</jxb:schemaBindings>
</xsd:appinfo>
</xsd:annotation>
I think I am setting "generateIsSetMethod" appropriately, but the methods are not generated.
Suggestions?

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Thanks,
Hank

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