Converting xsd to php nuSoap

hello guys,
im new in wsdl so i don't really know all about xsd's or wsdl's.
i have some client xsd who told me to build the webservice using the xsd schema. As i am familiar with php i started using nusoap as it seems to be much easier to start.
I am told that i must use first contract method, my understanding is that the web servise i build would have the same methods and classes the client xsd explains, and the client with send messages to my WS using the methods in it. Am i right ?

so my first xsd looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:np="path_here" targetNamespace="path_here" elementFormDefault="unqualified" attributeFormDefault="unqualified">
	<xs:include schemaLocation="types.xsd"/>
	<xs:element name="systemup">
		<xs:annotation>
			<xs:documentation>some text here</xs:documentation>
		</xs:annotation>
		<xs:complexType>
			<xs:sequence>
				<xs:element name="version" type="np:version"/>
				<xs:element name="idnumber" type="np:idnumber"/>
				<xs:element name="datetime" type="xs:dateTime"/>
			</xs:sequence>
		</xs:complexType>
	</xs:element>
</xs:schema>

Code (markup):

and my php code for this:

$server->wsdl->addSimpleType('version','xsd:string','SimpleType','struct',array());
$server->wsdl->addSimpleType('idnumber','xsd:string','SimpleType','struct');

$server->wsdl->addComplexType('systemup','complexType','struct','all','',
    array(
		'version' => array('name' => 'version', 'type' => 'tns:version'),
		'idnumber' => array('name' => 'idnumber', 'type' => 'tns:idnumber'),
		'datetime' => array('name' => 'datetime', 'type' => 'xsd:dateTime')
    )
);

$server->register('systemup', array(
    'version' => 'tns:version', 
	'idnumber' => 'tns:idnumber',
	'datetime' => 'xsd:dateTime'), array(), $namespace, $soapaction."/systemup", 'rpc', 'encoded','Check if the system is up'); 

PHP:

Is this the way how it is done ? Do you have any suggestions or anything to add ?

what about SimpleTypes that has more than one property as:

<xs:simpleType name="testid">
		<xs:restriction base="xs:string">
			<xs:minLength value="1"/>
			<xs:maxLength value="4"/>
		</xs:restriction>
</xs:simpleType>

Code (markup):

how it can be defined in nuSoap ??

Any help would be very precious. Thank you in advance.