title: maven-jaxb2-plugin fails with JAXB version attribute must be present
body: <p>I have the following configuration for <code>maven-jaxb2-plugin</code>:</p>
  
  <pre><code>            &lt;!-- https://mvnrepository.com/artifact/org.jvnet.jaxb2.maven2/maven-jaxb2-plugin --&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.jvnet.jaxb2.maven2&lt;/groupId&gt;
                  &lt;artifactId&gt;maven-jaxb2-plugin&lt;/artifactId&gt;
                  &lt;version&gt;0.13.2&lt;/version&gt;
                  &lt;executions&gt;
                      &lt;execution&gt;
                          &lt;goals&gt;
                              &lt;goal&gt;generate&lt;/goal&gt;
                          &lt;/goals&gt;
                      &lt;/execution&gt;
                  &lt;/executions&gt;
                  &lt;configuration&gt;
                      &lt;strict&gt;false&lt;/strict&gt;
                      &lt;schemaLanguage&gt;WSDL&lt;/schemaLanguage&gt;
                      &lt;generatePackage&gt;com.mycompany.project.domain.wsdl&lt;/generatePackage&gt;
                      &lt;schemas&gt;
                          &lt;schema&gt;
                              &lt;url&gt;url or file&lt;/url&gt;
                          &lt;/schema&gt;
                      &lt;/schemas&gt;
                  &lt;/configuration&gt;
              &lt;/plugin&gt;
  </code></pre>
  
  <p>and it is failing with:</p>
  
  <pre><code>[ERROR] Error while parsing schema(s).Location [ file:/home/hasancansaral/workspace/company/domain/src/main/xsd/delivery.wsdl{2,366}].
  </code></pre>
  
  <p>org.xml.sax.SAXParseException; systemId: file:/home/hasancansaral/workspace/company/domain/src/main/xsd/delivery.wsdl; lineNumber: 2; columnNumber: 366; JAXB version attribute must be present</p>
  
  <p>It doesn't make a difference if I run the plugin through IntelliJ IDEA or do a simple <code>mvn clean jax2b:generate</code>. However, the action is successful with the schema that can be found <a href="http://www.webservicex.com/stockquote.asmx?WSDL" rel="noreferrer">here</a>, so I am suspecting of my wsdl schema being actually malformed, which I cannot make public for the moment, but can provide via messages (I know that it is not much help to public as is, but if the problem is in the schema I will post the related problematic part of it here).</p>
  
  <p><strong>Note:</strong>
  SOAP UI validates the schema as well.</p>
  
  <p><strong>Note2:</strong>
  Same error is present with both <code>jax2b-maven-plugin</code> and <code>maven-jax2b-plugin</code>.</p>