}
        } finally {
            getInterpolator().clearAnswers();
        }
    }

    protected Interpolator createInterpolator() {
        StringSearchInterpolator interpolator = new StringSearchInterpolator();
        interpolator.setCacheAnswers(true);

        return interpolator;
    }

    private static final class InterpolateObjectAction implements PrivilegedAction<ModelInterpolationException> {

  </description>

  <properties>
    <overridden>PARENT</overridden>
    <!-- Test the effective value of this property in the child when "overridden" is defined by child as well -->
    <interpolated>${overridden}</interpolated>
  </properties>

  </description>

  <properties>
    <overridden>PARENT</overridden>
    <!-- Test the effective value of this property in the child when "overridden" is defined by child as well -->
    <interpolated>${overridden}</interpolated>
  </properties>

  <profiles>
    <profile>
      <id>it-parent</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
    </profile>
  </profiles>

    interface Transformer {
        /**
         * Interpolate the value read from the xml document
         *
         * @param source    The source value
         * @param fieldName A description of the field being interpolated. The implementation may use this to
         *                  log stuff.
         * @return the interpolated value
         */
        String transform(String source, String fieldName);
    }

      <releases>
        <!-- That's the boolean POM field we would like to interpolate -->
        <enabled>${releasesEnabled}</enabled>
      </releases>
    </repository>
  </repositories>

  <build>
    <resources>
      <resource>
        <directory>src/main/resources</directory>
        <!-- That's the boolean POM field we would like to interpolate -->
        <filtering>${filter.resources}</filtering>
      </resource>

  <name>Maven Integration Test :: MNG-3822</name>
  <description>
    Verify that POM interpolation uses basedir-aligned build directories.
  </description>

  <properties>
    <!-- this is where we collect all the interpolated values for the POM dump -->
    <buildMainSrc>${project.build.sourceDirectory}</buildMainSrc>
    <buildTestSrc>${project.build.testSourceDirectory}</buildTestSrc>

            }
        }

        Model tmpModel = lineage.get(0);

        // inject interpolated activations
        List<Profile> interpolated = interpolateActivations(tmpModel.getProfiles(), profileActivationContext, problems);
        if (interpolated != tmpModel.getProfiles()) {
            tmpModel = tmpModel.withProfiles(interpolated);
        }

        // inject external profile into current model

public interface ModelInterpolator {

    /**
     * Interpolates expressions in the specified model. Note that implementations are free to either interpolate the
     * provided model directly or to create a clone of the model and interpolate the clone. Callers should always use
     * the returned model and must not rely on the input model being updated.
     *
     * @param model The model to interpolate, must not be {@code null}.

  <name>Maven Integration Test :: MNG-3760</name>
  <description>
    Test interpolation of ${project.baseUri}
  </description>

  <properties>
    <!-- this is where we collect all the interpolated values for the POM dump -->
    <prop1>${project.baseUri}</prop1>
  </properties>

  <description>
    Test that interpolation of ${basedir} works for a POM that is not named "pom.xml"
  </description>

  <properties>
    <!-- this is where we collect all the interpolated values for the POM dump -->
    <prop0>${basedir}</prop0>
    <prop1>${project.basedir}</prop1>
  </properties>