Generating SimpleType in SOAP using PHP

[alpha_gear]

I'm doing a project and our structure of our page should be based to a current XML. now i am having difficult to find out how to generate the simpleType SOAP value found in the XML.
and XML code looks like this.
...
<simpleType name="useraccount">
<xsd:restriction base="xsd:string">
<xsd:enumeration value="username"/>
<xsd:enumeration value="password"/>
<xsd:enumeration value="accounttype"/>
</xsd:restriction>
</simpleType>
...
and my code for the ComplexType in PHP is:

$this->__typedef = array( //NEEDED //OK
"username" => "string",
"password" => "string",
"firstName" => "string",
"lastName" => "string",
"organization" => "string",
"tel" => "string",
"email" => "string",
"country" => "string",
"city" => "string"
);

with an output:
...
<complexType name="userprofiles">
<sequence>
<element name="username" nillable="true" type="xsd:string"/>
<element name="password" nillable="true" type="xsd:string"/>
<element name="firstName" nillable="true" type="xsd:string"/>
<element name="lastName" nillable="true" type="xsd:string"/>
<element name="organization" nillable="true" type="xsd:string"/>
<element name="tel" nillable="true" type="xsd:string"/>
<element name="email" nillable="true" type="xsd:string"/>
<element name="country" nillable="true" type="xsd:string"/>
<element name="city" nillable="true" type="xsd:string"/>
</sequence>
</complexType>
...