*
     * @return the model identifier, or {@code null} if not available or not applicable
     * @since 4.0.0
     */
    @Nullable
    default String getModelId() {
        return null;
    }

    /**
     * Interface for locating POM files within a project structure.
     * Implementations of this interface provide the ability to find POM files

    public int getLineNumber() {
        return lineNumber;
    }

    @Override
    public int getColumnNumber() {
        return columnNumber;
    }

    @Override
    public String getModelId() {
        return modelId;
    }

    @Override
    public Exception getException() {
        return exception;
    }

    @Override
    public String getMessage() {
        String msg;

     * exception is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the POM or an empty string if not known, never {@code null}.
     */
    public String getModelId() {
        if (result == null || result.getModelIds().isEmpty()) {
            return "";
        }
        return result.getModelIds().get(0);
    }

    /**

     *
     * @return The identifier of the model from which the problem originated or an empty string if unknown, never
     *         {@code null}.
     */
    String getModelId();

    /**
     * Gets the exception that caused this problem (if any).
     *
     * @return The exception that caused this problem or {@code null} if not applicable.
     */
    Exception getException();

            InputLocation location = plugin.getLocation("");
            if (location != null && location.getSource() != null) {
                trackingData.add(indent + location.getSource().getModelId() + " (implicit)");
                indent.append("  ");
            }
        } else if (collectStepTrace != null) {
            if (collectStepTrace.getPath().get(0).getArtifact() == null) {
                return;

            this.modelId = modelId;
        }

        @Override
        public Path getPath() {
            return null;
        }

        @Override
        @Nullable
        public String getModelId() {
            return modelId;
        }

        @Override
        public Source resolve(String relative) {
            return null;
        }

        @Override
        @Nullable

                        && p.getLocation("version").getSource() != null
                        && defaulModelId.equals(
                                p.getLocation("version").getSource().getModelId()))
                .distinct()
                .map(Plugin::getArtifactId) // managed by us, groupId is always o.a.m.plugins
                .toList();

        if (!unversionedPlugins.isEmpty()) {

        if (inputLocation != null && inputLocation.getSource() != null) {
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append(inputLocation.getSource().getModelId());
            String location = inputLocation.getSource().getLocation();
            if (location != null) {
                if (location.contains("://")) {

                            && p.getLocation("version").getSource() != null
                            && defaulModelId.equals(
                                    p.getLocation("version").getSource().getModelId()))
                    .distinct()
                    .map(Plugin::getArtifactId) // managed by us, groupId is always o.a.m.plugins
                    .toList();
            if (!unversionedPlugins.isEmpty()) {

      </fields>
      <codeSegments>
        <codeSegment>
          <version>4.0.0+</version>
          <code>
            <![CDATA[
    @Override
    public String toString() {
        return getModelId() + " " + getLocation();
    }
            ]]>
          </code>
        </codeSegment>
      </codeSegments>
    </class>
  </classes>