for (Repository repository : repositories) {
            validateStringNotEmpty(
                    prefix, prefix2, "id", problems, Severity.ERROR, Version.V20, repository.getId(), null, repository);

            if (validateStringNotEmpty(
                    prefix,
                    prefix2,
                    "[" + repository.getId() + "].url",
                    problems,

        for (Repository repository : repositories) {
            validateStringNotEmpty(
                    prefix, prefix2, "id", problems, Severity.ERROR, Version.V20, repository.getId(), null, repository);

            if (validateStringNotEmpty(
                    prefix,
                    prefix2,
                    "[" + repository.getId() + "].url",
                    problems,

      <name>Maven Integration Test Plugin</name>
      <prefix>clean</prefix>
      <artifactId>maven-clean-plugin</artifactId>
    </plugin>
    <plugin>
      <name>Maven Integration Test Plugin</name>
      <prefix>deploy</prefix>
      <artifactId>maven-deploy-plugin</artifactId>
    </plugin>
    <plugin>
      <name>Maven Integration Test Plugin</name>
      <prefix>install</prefix>
      <artifactId>maven-install-plugin</artifactId>

import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.apache.maven.plugin.prefix.DefaultPluginPrefixRequest;
import org.apache.maven.plugin.prefix.NoPluginFoundForPrefixException;
import org.apache.maven.plugin.prefix.PluginPrefixRequest;
import org.apache.maven.plugin.prefix.PluginPrefixResolver;
import org.apache.maven.plugin.prefix.PluginPrefixResult;
import org.apache.maven.plugin.version.DefaultPluginVersionRequest;

            writeThrowable(se, stream, "Suppressed", prefix + "    ");
        }
        Throwable cause = t.getCause();
        if (cause != null && t != cause) {
            writeThrowable(cause, stream, "Caused by", prefix);
        }
    }

    private void writeThrowable(Throwable t, PrintStream stream, String caption, String prefix) {
        MessageBuilder builder =

                }

                String prefix = "profiles.profile[" + profile.getId() + "].";

                validateRepositories(problems, profile.getRepositories(), prefix + "repositories.repository");
                validateRepositories(
                        problems, profile.getPluginRepositories(), prefix + "pluginRepositories.pluginRepository");
            }
        }

    }

    public XmlNodeImpl(
            String prefix,
            String namespaceUri,
            String name,
            String value,
            Map<String, String> attributes,
            List<XmlNode> children,
            Object location) {
        this.prefix = prefix == null ? "" : prefix;
        this.namespaceUri = namespaceUri == null ? "" : namespaceUri;

<?xml version="1.0" encoding="UTF-8"?>
<metadata>
  <plugins>
    <plugin>
      <name>Maven Integration Test Plugin</name>
      <prefix>it</prefix>
      <artifactId>maven-it-plugin</artifactId>
    </plugin>
  </plugins>

            Other values define only the prefix of classes/resources being exposed. Their binary name must be equal to the prefix or starting with the prefix (followed by "." or "$").

        }
    }

    private void append(MessageBuilder buffer, MojoExecution me) {
        String prefix = me.getMojoDescriptor().getPluginDescriptor().getGoalPrefix();
        if (prefix == null || prefix.isEmpty()) {
            prefix = me.getGroupId() + ":" + me.getArtifactId();
        }
        buffer.mojo(prefix + ':' + me.getVersion() + ':' + me.getGoal());
        if (me.getExecutionId() != null) {