import com.sun.org.apache.xpath.internal.axes.UnionPathIterator; //导入依赖的package包/类
/**
 * Compile a location path union. The UnionPathIterator itself may create
 * {@link com.sun.org.apache.xpath.internal.axes.LocPathIterator} children.
 *
 * @param opPos The current position in the m_opMap array.
 *
 * @return reference to {@link com.sun.org.apache.xpath.internal.axes.LocPathIterator} instance.
 *
 * @throws TransformerException if a error occurs creating the Expression.
 */
protected Expression union(int opPos) throws TransformerException
{
  locPathDepth++;
  try
  {
    return UnionPathIterator.createUnionIterator(this, opPos);
  }
  finally
  {
    locPathDepth--;
  }
}
 

import com.sun.org.apache.xpath.internal.axes.UnionPathIterator; //导入依赖的package包/类
/**
 * Visit a UnionPath.
 * @param owner The owner of the expression, to which the expression can
 *              be reset if rewriting takes place.
 * @param path The UnionPath object.
 * @return true if the sub expressions should be traversed.
 */
public boolean visitUnionPath(ExpressionOwner owner, UnionPathIterator path)
{
        return true;
}