Valid reference to external namespace?

Hello,

Below, I have an example of an XSD file that is referencing a type defined in another schema, but I’m not positive that it’s doing it correctly.  Note that the CSTA namespace is defined as “csta”, and in the RegisterDevice type, I reference a type from that namespace: type=”csta:DeviceID”.  There is no explicit “include” statement.  Is this a legitimate way to reference that type?  Castor seems to think so, but I wanted to verify it anyway…

Thanks!

Joel Ezell

Avaya Inc.

<?xml version="1.0" encoding="UTF-8"?>

<xsd:schema targetNamespace="http://www.avaya.com/csta"

  xmlns:xsd="http://www.w3.org/2001/XMLSchema"

  xmlns:csta="http://www.ecma.ch/standards/ecma-323/csta/ed2"

  elementFormDefault="qualified" attributeFormDefault="qualified">

  <xsd:include schemaLocation="ip-address.xsd"/>

  <xsd:include schemaLocation="login-info.xsd"/>

  <!-- RegisterDevice -->

  <xsd:element name="RegisterDevice">

    <xsd:complexType>

      <xsd:sequence>

        <xsd:element name="device"      type="csta:DeviceID"/>

        <xsd:element name="loginInfo"   type="acx:LoginInfo" minOccurs="0"/>

        <xsd:element name="localMediaInfo"   type="acx:MediaInfo" minOccurs="0"/>

        <xsd:element ref="csta:extensions" minOccurs="0"/>

      </xsd:sequence>

    </xsd:complexType>

  </xsd:element>