public Iterator getAllValueConstraint() {
    return allValueConstraints.iterator();
  }
Returns an <code>Iterator</code> of the <code>valueConstraint</code>s (as <code>String</code>s)
over all instances of this snapshot's <code>Region</code>.
geode-core/src/main/java/org/apache/geode/internal/admin/CompoundRegionSnapshot.java