then:
        format(result.docbook) == '''<para><UNHANDLED-ELEMENT>&lt;unknown&gt;text&lt;/unknown&gt;</UNHANDLED-ELEMENT><UNHANDLED-ELEMENT>&lt;inheritdoc&gt;<UNHANDLED-TAG>{@unknown text}</UNHANDLED-TAG><UNHANDLED-TAG>{@p text}</UNHANDLED-TAG><UNHANDLED-TAG>{@ unknown}</UNHANDLED-TAG>&lt;/inheritdoc&gt;</UNHANDLED-ELEMENT></para>'''
    }

    def handlesMissingStartTags() {

                </project>
                """;

            Document document = new Parser().parse(pomXml);
            ModelVersionUtils.updateModelVersion(document, targetVersion);
            Element root = document.root();
            Element modelVersionElement = root.child("modelVersion").orElse(null);
            assertEquals(targetVersion, modelVersionElement.textContentTrimmed());
        }

     *
     * @return int
     */
    public int getLineNumber() {
        return this.lineNumber;
    } // -- int getLineNumber()

    /**
     * Gets the InputLocation for a specific nested element key.
     *
     * @param key the key to look up
     * @return the InputLocation for the specified key, or null if not found
     */
    @Override
    public InputLocation getLocation(Object key) {

        return setConfiguration(configuration, null);
    }

    @Override
    public DefaultBeanConfigurationRequest setConfiguration(Object configuration, String element) {
        this.configuration = configuration;
        this.configurationElement = element;
        return this;
    }

    /**
     * Sets the configuration to the configuration taken from the specified build plugin in the POM. First, the build

	</li>
	<li>An element list that does not contain any keys must
	    list an element for each struct field in the
	    order in which the fields are declared.
	</li>
	<li>If any element has a key, every element must have a key.
	</li>
	<li>An element list that contains keys does not need to
	    have an element for each struct field. Omitted fields

    </default>
  </defaults>
  <classes>
    <class rootElement="true" xml.tagName="extension">
      <name>ExtensionDescriptor</name>
      <version>1.0.0</version>
      <description><![CDATA[Root element of the <code>extension.xml</code> file.]]></description>
      <fields>
        <field>
          <name>exportedPackages</name>
          <version>1.0.0</version>
          <association>
            <type>String</type>

    /**
     * Returns {@code true} if reported problem count exceeded allowed count, and issues were lost. When this
     * method returns {@code true}, it means that element count of stream returned by method {@link #problems()}
     * and the counter returned by {@link #totalProblemsReported()} are not equal (latter is bigger than former).
     *

    </default>
  </defaults>
  <classes>
    <class rootElement="true" xml.tagName="remoteResourcesBundle">
      <name>RemoteResourcesBundle</name>
      <version>1.1.0</version>
      <description>Root element of the remote-resources.xml file.</description>
      <fields>
        <field>
          <name>remoteResources</name>
          <version>1.1.0</version>
          <description>

import java.util.stream.Collectors;

import org.apache.maven.api.cli.cisupport.CIInfo;

/**
 * CI detector helper: it uses service discovery to discover {@link CIDetector}s. If resulting list has more than
 * one element, it will remove the {@link GenericCIDetector} result, assuming a more specific one is also present.
 */
public final class CIDetectorHelper {
    private CIDetectorHelper() {}

    public static List<CIInfo> detectCI() {

import javax.xml.transform.dom.DOMSource
import javax.xml.transform.stream.StreamResult
import org.w3c.dom.Document
import org.w3c.dom.Element
import org.w3c.dom.Node

class XIncludeAwareXmlProvider {

    Document root

    Element parse(File sourceFile) {
        root = parseSourceFile(sourceFile)
        root.documentElement
    }

    Node emptyDoc() {