False Unique Particle Attribution (UPA)

Given the following two schemas

(Root)

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:someNs="first" xmlns:someOtherNs="second"
    xmlns:xsd="http://ift.tt/tphNwY" elementFormDefault="unqualified"
    attributeFormDefault="unqualified" version="1.0" targetNamespace="first">
    <xsd:import namespace="second" schemaLocation="./child.xsd" />
    <xsd:element name="employee" type="someNs:fullpersoninfo" />

    <xsd:complexType name="personinfo">
        <xsd:sequence>
            <xsd:element name="firstname" type="xsd:string" />
            <xsd:element name="lastname" type="xsd:string" />
        </xsd:sequence>
    </xsd:complexType>

    <xsd:complexType name="fullpersoninfo">
        <xsd:complexContent>
            <xsd:extension base="someNs:personinfo">
                <xsd:sequence>
                    <xsd:element name="address" type="xsd:string" />
                    <xsd:element name="city" type="xsd:string" />
                    <xsd:element name="country" type="xsd:string" />
                    <xsd:group ref="someOtherNs:Child" />
                </xsd:sequence>
            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>
</xsd:schema>

and (child)

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="someId-1" targetNamespace="second"
    elementFormDefault="qualified" xmlns:someOtherNs="second"
    xmlns:xs="http://ift.tt/tphNwY" xmlns="second">

    <xs:element name="ChildElement" type="ChildElement"
        nillable="false" />

    <xs:complexType name="ChildElement">
        <xs:sequence>
            <xs:element name="firstname" type="xs:string" />
            <xs:element name="lastname" type="xs:string" />
        </xs:sequence>
    </xs:complexType>

    <xs:group name="Child">
        <xs:sequence>
            <xs:element ref="ChildElement" minOccurs="0" maxOccurs="1" />
            <xs:any processContents="lax" minOccurs="0" maxOccurs="unbounded"
                namespace="##other" />
        </xs:sequence>
    </xs:group>

</xs:schema>

a Unique particle attribution should not be present as the child uses elementFormDefault="qualified" and the root uses elementFormDefault="unqualified". However, when run through Java's xjc, it is not possible to use the generated classes as the annotations on the classes seems to be insufficient - at least it seems. How can the UPA be avoided?