simpleType extension doesn't generate select element options

My XSD:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="/xsd2html2xml/xsd2html2xml.xsl"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

    <xs:simpleType name="size">
        <xs:restriction base="xs:string">
            <xs:enumeration value="small"/>
            <xs:enumeration value="medium"/>
            <xs:enumeration value="large"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="jeans">
        <xs:simpleContent>
            <xs:extension base="size">
                <xs:attribute name="sex">
                    <xs:simpleType>
                        <xs:restriction base="xs:string">
                            <xs:enumeration value="male"/>
                            <xs:enumeration value="female"/>
                        </xs:restriction>
                    </xs:simpleType>
                </xs:attribute>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:element name="MY JEANS" type="jeans"/>

</xs:schema>

sex attribute select element options are correctly generated, but the inherited size attribute select element does'n contain options. This is the HTML generated:

<html>
<body>
    <form action="javascript:void(0);" class="xsd2html2xml" onsubmit="myFunction(htmlToXML(this));">
        <section>
            <fieldset data-xsd2html2xml-namespace="" data-xsd2html2xml-type="element" data-xsd2html2xml-name="MY JEANS"
                data-xsd2html2xml-xpath="/MY JEANS">
                <legend>MY JEANS</legend>
                <label data-xsd2html2xml-namespace="" data-xsd2html2xml-type="content" data-xsd2html2xml-name="MY JEANS"
                    data-xsd2html2xml-xpath="/MY JEANS"><select
                        onchange="this.childNodes.forEach(function(o) { if (o.nodeType == Node.ELEMENT_NODE) o.removeAttribute(&quot;selected&quot;); }); this.children[this.selectedIndex].setAttribute(&quot;selected&quot;,&quot;selected&quot;);"
                        required="required" data-xsd2html2xml-description="MY JEANS"
                        data-xsd2html2xml-primitive="string"></select><span>MY JEANS</span></label>
                <label data-xsd2html2xml-namespace="" data-xsd2html2xml-type="attribute" data-xsd2html2xml-name="sex"
                    data-xsd2html2xml-xpath="/MY JEANS/@sex"><select
                        onchange="this.childNodes.forEach(function(o) { if (o.nodeType == Node.ELEMENT_NODE) o.removeAttribute(&quot;selected&quot;); }); this.children[this.selectedIndex].setAttribute(&quot;selected&quot;,&quot;selected&quot;);"
                        data-xsd2html2xml-description="sex" data-xsd2html2xml-primitive="string">
                        <option value="male">male</option>
                        <option value="female">female</option>
                    </select><span>sex</span></label>
            </fieldset>
        </section><button type="submit"></button>
    </form>
</body>
<html>

Is it an error or is there some concept in the xsd extensions that I have misinterpreted?

MichielCM / xsd2html2xml

simpleType extension doesn't generate select element options #43