*   <li>Description: {@code <memory>} or {@code <database>}</li>
     * </ul>
     *
     * @return a non-null string describing the source location
     */
    @Nonnull
    String getLocation();

    /**
     * Resolves a new source relative to this one.
     * <p>
     * The resolution strategy depends on the source type:
     * <ul>
     *   <li>File sources resolve against their parent directory</li>

        </field>
      </fields>
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        <codeSegment>
          <version>1.2.0+</version>
          <code>
    @Override
    public String toString() {
        return getLocation();
    }
          </code>
        </codeSegment>
      </codeSegments>
    </class>
  </classes>

        </field>
      </fields>
      <codeSegments>
        <codeSegment>
          <version>2.0.0+</version>
          <code>
    @Override
    public String toString() {
        return getLocation();
    }
          </code>
        </codeSegment>
      </codeSegments>
    </class>
  </classes>

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