code: public void setPathClass(String aPath, Class aClass)
      {
          List pathClasses = new ArrayList();
          pathClasses.add(aClass);
          m_pathClasses.put(aPath, pathClasses);
      }
docs: Set the Class for a path. Used for relationships to extents.<br>
  SqlStatment will use this class when resolving the path.
  Without this hint SqlStatment will use the base class the
  relationship points to ie: Article instead of CdArticle.
  Using this method is the same as adding just one hint
  
  @param aPath the path segment ie: allArticlesInGroup
  @param aClass the Class ie: CdArticle
  @see org.apache.ojb.broker.QueryTest#testInversePathExpression()
  @see #addPathClass