code: public Context locate(ILexNameToken name)
  	{
  		Value v = get(name);
  
  		if (v == null)
  		{
  			if (outer != null)
  			{
  				return outer.locate(name);
  			} else
  			{
  				return null;
  			}
  		} else
  		{
  			return this;
  		}
  	}
docs: Locate the Context in a chain that contains a name, if any.
  
  @param name
  @return