鉴于下面的 DTD 文件：
!ELEMENT hotels (address+)>
<!ELEMENT address (city,street,phone,hotelDetails)>
<!ELEMENT hotelDetails (hotel_code,hotel_rank,hotel_name)>
<!ELEMENT street (#PCDATA)>
<!ELEMENT city (#PCDATA)>
<!ELEMENT hotel_rank (#PCDATA)>
<!ELEMENT phone (#PCDATA)>
<!ELEMENT hotel_code (#PCDATA)>
<!ELEMENT hotel_name (#PCDATA)>
<!ELEMENT guests (id+)>
<!ELEMENT guestDetails (name,city,address,state)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT city (#PCDATA)>
<!ELEMENT address (#PCDATA)>
<!ELEMENT state (#PCDATA)>
如您所见，我有两个不同的表：hotels& guests，其中两个表都有city. 当我尝试保存文件时，XMLspy我得到：
Element 'city' has already been declared.
有没有办法为两个表声明该字段？
问候
罗恩