I include the below xsd file:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns="http://www.xxxx.com/schemas/2005/06/messages" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.xxxx.com/schemas/2005/06/messages" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:include schemaLocation="xxxxCommonTypes.xsd" />
  <xs:element name="HotelDetailRQ">
    <xs:annotation>
      <xs:documentation>Request data to obtain detailed information for the specified hotel product.</xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent mixed="false">
        <xs:extension base="CoreRequest">
          <xs:sequence>
            <xs:element name="HotelCode">
              <xs:annotation>
                <xs:documentation>Hotel code to obtain detailed inormation.</xs:documentation>
              </xs:annotation>
              <xs:simpleType>
                <xs:restriction base="xs:string">
                  <xs:minLength value="1" />
                  <xs:maxLength value="10" />
                </xs:restriction>
              </xs:simpleType>
            </xs:element>
          </xs:sequence>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
</xs:schema>

to a wsdl file via;

<xsd:schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://axis.frontend.hydra.xxxx.com">
      <xsd:import schemaLocation="C:\Users\xxxx\HotelDetailRQ.xsd" namespace="http://www.xxxx.com/schemas/2005/06/messages" />
</xsd:schema>

The problem is when I add the wsdl file to visual studio as a web reference, it does not generate the HotelDetailRQ proxy class in reference.cs file. So I am unable to use a generated HotelDetailRQ class.

I am not experienced in using xsd files or wsdl files. Can you point me to where I might be making mistake here?