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    copied!<p><strong>import vs. include</strong></p> <p>The primary purpose of an import is to import a <em>namespace</em>. A more common use of the XSD import statement is to import a <em>namespace</em> which appears in another file. You might be gathering the namespace information from the file, but don't forget that it's the <strong>namespace</strong> that you're importing, <strong>not the file</strong> (don't confuse an <code>import</code> statement with an <code>include</code> statement).</p> <p>Another area of confusion is how to specify the location or path of the included <code>.xsd</code> file: An XSD import statement has an optional attribute named <code>schemaLocation</code> but it is not necessary <strong>if</strong> the namespace of the import statement is at the same location (in the same file) as the import statement itself.</p> <p>When you do chose to use an external <code>.xsd</code> file for your WSDL, the <code>schemaLocation</code> attribute becomes necessary. Be very sure that the <em>namespace</em> you use in the import statement is the same as the targetNamespace of the schema you are importing. That is, all 3 occurrences must be identical:</p> <p><strong>WSDL:</strong></p> <pre><code>xs:import namespace="urn:listing3" schemaLocation="listing3.xsd"/&gt; </code></pre> <p><strong>XSD:</strong></p> <pre><code>&lt;xsd:schema targetNamespace="urn:listing3" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt; </code></pre> <p>Another approach to letting know the WSDL about the XSD is through Maven's pom.xml:</p> <pre><code>&lt;plugin&gt; &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt; &lt;artifactId&gt;xmlbeans-maven-plugin&lt;/artifactId&gt; &lt;executions&gt; &lt;execution&gt; &lt;id&gt;generate-sources-xmlbeans&lt;/id&gt; &lt;phase&gt;generate-sources&lt;/phase&gt; &lt;goals&gt; &lt;goal&gt;xmlbeans&lt;/goal&gt; &lt;/goals&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;version&gt;2.3.3&lt;/version&gt; &lt;inherited&gt;true&lt;/inherited&gt; &lt;configuration&gt; &lt;schemaDirectory&gt;${basedir}/src/main/xsd&lt;/schemaDirectory&gt; &lt;/configuration&gt; &lt;/plugin&gt; </code></pre> <p>You can read more on this in this <a href="http://www.ibm.com/developerworks/webservices/library/ws-tip-imports/" rel="noreferrer">great IBM article</a>. It has typos such as <code>xsd:import</code> instead of <code>xs:import</code> but otherwise it's fine.</p>
 

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