schema -name spaces doubt in wsdl

[padmagvs]

I have a wsdl something like this

<?xml version="1.0" ?>

<definitions targetNamespace="http://abc.com/namespace/wsif/samples/abc"
xmlns:tns="http://abc.com/namespace/wsif/samples/abc"
xmlns:typens="urn:xml-soap-address-demo"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns="http://schemas.xmlsoap.org/wsdl/">

<!-- type defs -->
<types>
<xsd:schema xmlns="urn:xml-soap-address-demo" targetNamespace="urn:xml-soap-address-demo" elementFormDefault="qualified">
<xsd:complexType name="phone">
<xsd:element name="areaCode" type="xsd:int"/>
<xsd:element name="exchange" type="xsd:string"/>
<xsd:element name="number" type="xsd:string"/>
</xsd:complexType>

<xsd:complexType name="address">
<xsd:element name="streetNum" type="xsd:int"/>
<xsd:element name="streetName" type="xsd:string"/>
<xsd:element name="city" type="xsd:string"/>
<xsd:element name="state" type="xsd:string"/>
<xsd:element name="zip" type="xsd:int"/>
<xsd:element name="phoneNumber" type="typens:phone"/>
</xsd:complexType>
</xsd:schema>
</types>
.......

</definitions>


My doubt is as elements declared in schema are in default name space is below delartion valid

<xsd:element name="phoneNumber" type="phone"/> instead of

<xsd:element name="phoneNumber" type="typens:phone"/>

Can any one please confirm me ?

Can we declare names spaces again (here declared in schema) apart from the one declared in root element here <definition> element