jaxb xjc generate @XmlSchemaType

I would like to use xjc to generate JAXB objects while using an XmlJavaTypeAdapter

I'm currently using the following in global bindings:

<xjc:javaType name="java.lang.Boolean" 
                      xmlType="xsd:boolean" 
                      adapter="path.to.my.CustomBooleanAdapter"/>

It generates the following code:

 @XmlJavaTypeAdapter(CustomBooleanAdapter.class)
    @XmlElement(type=String.class)
    private Boolean finished;

However I would like the code to have the @XmlSchemaType of boolean and without the @XmlElement type String

@XmlJavaTypeAdapter(BooleanAdapter.class)
@XmlSchemaType(name = "boolean")
private Boolean finished;

Is there a way to tell xjc to generate the @XmlSchemaType annotation and remove the @XmlElement of type String