ex3-9.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE BookCatalog 
[<!ELEMENT BookCatalog  (Book)*>
<!ELEMENT Book          ((Title|BookCode), CoAuthor, Year, Summary, Price)>
<!--ATTLIST Book lang CDATA "kor"-->
<!--ATTLIST Book lang CDATA #FIXED "eng"-->
<!--ATTLIST Book lang CDATA #REQUIRED-->
<!ATTLIST Book lang CDATA #IMPLIED>
<!--ATTLIST Book code ID #REQUIRED-->
<!ATTLIST Book code ID #IMPLIED>
<!ELEMENT Title         (#PCDATA)>
<!ELEMENT BookCode      (#PCDATA)>
<!ELEMENT CoAuthor      (#PCDATA|Author)*>
<!ELEMENT Author        (#PCDATA)>
<!ELEMENT Year          (#PCDATA)>
<!ELEMENT Summary ANY>
<!ELEMENT Price         (#PCDATA)>
<!ATTLIST Price unit (원 | 달러 | 엔 | 프랑) #IMPLIED>
<!ENTITY rh "류현">
]>
<BookCatalog>
    <Book code="myBook1">
        <!--BookCode>ABC-1</BookCode-->
        <Title>new ideas from dead economists</Title>
        <CoAuthor>
            <Author>Todd G. Buchholz</Author>
            &rh;
        </CoAuthor>
        <Year>2007</Year>
        <Summary> 현대 경제사상의 이해를 위한 입문서 </Summary>
        <Price unit ="원"> 12000 </Price>
    </Book>
    <Book lang="eng" code="myBook2">
        <BookCode>ABC-2</BookCode>
        <!--Title>Pensées</Title-->
        <CoAuthor> 
            <Author>Blaise Pascal</Author>
            A.J 크라일 샤이머
            &rh;
        </CoAuthor>
        <Year>1670</Year>
        <Summary> 기독교의 논리적 철학적 변증서 </Summary>
        <Price unit ="원"> 5000 </Price>
    </Book>
    <Book lang="eng" code="myBook3">
        <BookCode>ABC-3</BookCode>
        <!--Title>Zero to One</Title-->
        <CoAuthor>
            blake masters
            <Author>Peter Thiel</Author>
        </CoAuthor>
        <Year>2014</Year>
        <Summary> 스탠퍼드 대학교 스타트업 최고 명강의 </Summary>
        <Price unit ="달러"> 12 </Price>
    </Book>
    <Book lang="eng" code="myBook4">
        <!--BookCode>ABC-4</BookCode-->
        <Title>Gang Leader for a Day</Title>
        <CoAuthor>
            <Author>Sudhir Venkatesh</Author>
            김영선
        </CoAuthor>
        <Year>2008</Year>
        <Summary> 통계와 연구실을 박차고 거리로 나선 괴짜 사회학자의 세상탐구 </Summary>
        <Price unit ="엔"> 1000 </Price>
    </Book>
</BookCatalog>