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第 190 頁
TRIPLES WALKED_BATTER
HOME_RUNS STRUCK_OUT_BATTER
WINS COMPLETE_GAMES
LOSSES SHUT_OUTS
SAVES
所編寫的DTD 要為每個元素作元素聲明。每一元素聲明列出元素名和它的子元素。例如，DTD 規定一個LEAGUE 元素有三個
DIVISION 子元素。還規定SURNAME 要放在PLAYER 之內而不能在它外面。還規定每個DIVISION 有不確定的TEAM 元素數目但
絕不能少于一個。
DTD 可要求PLAYER 只有一個GIVEN_NAME、SURNAME、POSITION 和GAMES 元素，但是否有RBI 和ERA 元素則任意。而且要求
GIVEN_NAME、SURNAME、POSITION 和GAMES 元素以特定的順序出現。例如，GIVEN_NAME、SURNAME、POSITION 和GAMES 只能
在PLAYER 元素內使用。
如果頭腦中有一份具體的結構完整的示例文檔，該文檔使用了想要出現在DTD 中所有的元素，那么開始就很容易了。第4
章中的例子在這里就可起這一作用。清單8-4 是經過整理的第4 章清單4-1 的簡化版。盡管它只有兩名球員，卻可以說明所
有基本的元素。
清單8-4：需要編寫DTD 結構完整的XML 文檔
<?xml version="1.0" standalone="yes"?>
<SEASON>
<YEAR>1998</YEAR>
<LEAGUE>
<LEAGUE_NAME>National</LEAGUE_NAME>
<DIVISION>
<DIVISION_NAME>East </DIVISION_NAME>
<TEAM>
<TEAM_CITY>Florida</TEAM_CITY>
<TEAM_NAME>Marlins</TEAM_NAME>
<PLAYER>
<SURNAME>Ludwick</SURNAME>
XML 實用大全
第 191 頁
<GIVEN_NAME>Eric</GIVEN_NAME>
<POSITION>Starting Pitcher</POSITION>
<WINS>1</WINS>
<LOSSES>4</LOSSES>
<SAVES>0</SAVES>
<GAMES>13</GAMES>
<GAMES_STARTED>6</GAMES_STARTED>
<COMPLETE_GAMES>0</COMPLETE_GAMES>
<SHUT_OUTS>0</SHUT_OUTS>
<ERA>7.44</ERA>
<INNINGS>32.2</INNINGS>
<HOME_RUNS>46</ HOME_RUNS>
<RUNS>7</RUNS>
<EARNED_RUNS>31</EARNED_RUNS>
<HIT_BATTER>27</ HIT_BATTER>
<WILD_PITCHES>0</WILD_PITCHES>
<WALKED_BATTER>0</WALKED_BATTER>
<STRUCK_OUT_BATTER>17</STRUCK_OUT_BATTER>
</PLAYER>
<PLAYER>
<SURNAME>Daubach</SURNAME>
<GIVEN_NAME>Brian</GIVEN_NAME>
<POSITION>First Base</POSITION>
<GAMES>10</GAMES>
XML 實用大全
第 192 頁
<GAMES_STARTED>3</GAMES_STARTED>
<AT_BATS>15</AT_BATS>
<RUNS>0</RUNS>
< HITS>3</HITS>
<DOUBLES>1</DOUBLES>
<TRIPLES>0</TRIPLES>
<HOME_RUNS>0</HOME_RUNS>
<RBI>3</RBI>
<STEALS>0</STEALS>
<CAUGHT_STEALING>0</CAUGHT_STEALING>
<SACRIFICE_ HITS>0</SACRIFICE_HITS>
<SACRIFICE_FLIES>0</SACRIFICE_FLIES>
<ERRORS>0</ERRORS>
<WALKS>1</WALKS>
<STRUCK_OUT>5</STRUCK_OUT>
<HIT_BY_PITCH>1</HIT_BY_PITCH >
</PLAYER>
</TEAM>
<TEAM>
<TEAM_CITY>Montreal</TEAM_CITY>
<TEAM_NAME>Expos</TEAM_NAME>
</TEAM>
<TEAM>
<TEAM_CITY>New York</TEAM_CITY>
XML 實用大全
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<TEAM_NAME>Mets</TEAM_NAME>
</TEAM>
<TEAM>
<TEAM_CITY>Philadelphia</TEAM_CITY>
<TEAM_NAME>Phillies</TEAM_NAME>
</TEAM>
</DIVISION>
<DIVISION>
<DIVISION_NAME>Central</DIVISION_NAME>
<TEAM>
<TEAM_CITY>Chicago</TEAM_CITY>
<TEAM_NAME>Cubs</TEAM_NAME>
</TEAM>
</DIVISION>
<DIVISION>
<DIVISION_NAME>West</DIVISION_NAME>
<TEAM>
<TEAM_CITY>Arizona</TEAM_CITY>
<TEAM_NAME>Diamondbacks</TEAM_NAME>
</TEAM>
</DIVISION>
</LEAGUE>
<LEAGUE>
<LEAGUE_NAME>American</LEAGUE_NAME>
XML 實用大全
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<DIVISION>
<DIVISION_NAME>East </DIVISION_NAME>
<TEAM>
<TEAM_CITY>Baltimore</TEAM_CITY>
<TEAM_NAME>Orioles</TEAM_NAME>
</TEAM>
</DIVISION>
<DIVISION>
<DIVISION_NAME>Central</DIVISION_NAME>
<TEAM>
<TEAM_CITY>Chicago</TEAM_CITY>
<TEAM_NAME>White Sox</TEAM_NAME>
</TEAM>
</DIVISION>
<DIVISION>
<DIVISION_NAME>West</DIVISION_NAME>
<TEAM>
<TEAM_CITY>Anaheim</TEAM_CITY>
<TEAM_NAME>Angels</TEAM_NAME>
</TEAM>
　
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