1
<!ELEMENT Scholars (Scholar)+>
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<!ELEMENT Scholar (((Firstname,Lastname)|Fullname),
3
Nationality,Birthplace,Age,Sex,Professions)>
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<!ATTLIST Scholar SID ID #REQUIRED type CDATA #FIXED 'Scientist'>
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<!ELEMENT Firstname (#PCDATA)>
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<!ELEMENT Lastname (#PCDATA)>
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<!ELEMENT Fullname (#PCDATA)>
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<!ELEMENT Nationality (#PCDATA)>
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<!ELEMENT Birthplace EMPTY>
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<!ELEMENT Age (#PCDATA)>
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<!ATTLIST Age Status (Alive|Dead) 'Alive'>
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<!ATTLIST Age Birsthdate CDATA #REQUIRED>
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<!ATTLIST Age Deathdate CDATA #IMPLIED>
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<!ELEMENT Sex (#PCDATA)>
15
<!ELEMENT Professions (Profession+)>
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<!ELEMENT Profession (#PCDATA)>

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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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<!DOCTYPE Scholars [
3
    <!ELEMENT Scholars (Scholar)+>
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    <!ELEMENT Scholar (((Firstname,Lastname)|Fullname),
5
            Nationality,Birthplace,Age,Sex,Professions)>
6
    <!ATTLIST Scholar SID ID #REQUIRED type CDATA #FIXED 'Scientist'>
7
    <!ELEMENT Firstname (#PCDATA)>
8
    <!ELEMENT Lastname (#PCDATA)>
9
    <!ELEMENT Fullname (#PCDATA)>
10
    <!ELEMENT Nationality (#PCDATA)>
11
    <!ELEMENT Birthplace EMPTY>
12
    <!ELEMENT Age (#PCDATA)>
13
    <!ATTLIST Age Status (Alive|Dead) 'Alive'>
14
    <!ATTLIST Age Birsthdate CDATA #REQUIRED>
15
    <!ATTLIST Age Deathdate CDATA #IMPLIED>
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    <!ELEMENT Sex (#PCDATA)>
17
    <!ELEMENT Professions (Profession+)>
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    <!ELEMENT Profession (#PCDATA)>
19
]>
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<Scholars>
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    <Scholar SID="S001">
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        <Firstname>Anka</Firstname>
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        <Lastname>Businiao</Lastname>
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        <Nationality>China</Nationality>
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        <Birthplace/>
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        <Age Status="Alive" Birsthdate="1987-01-20">38</Age>
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        <Sex>Male</Sex>
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        <Professions>
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            <Profession>Software Engineer</Profession>
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            <Profession>Professor</Profession>
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        </Professions>
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    </Scholar>
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    <Scholar SID="S002">
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        <Fullname>Bertand Yuen</Fullname>
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        <Nationality>USA</Nationality>
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        <Birthplace/>
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        <Age Status="Alive" Birsthdate="2005-03-14">20</Age>
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        <Sex>Female</Sex>
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        <Professions>
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            <Profession>Computer Scientist</Profession>
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        </Professions>
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    </Scholar>
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</Scholars>

1
<Events>
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    <Event>
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        <title>Registration Event</title>
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        <date>Oct 10, 2023</date>
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    </Event>
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</Events>

1
<Events>
2
    <Event>
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        <title>Books-Signing Event</title>
4
        <date>Oct 15, 2023</date>
5
    </Event>
6
</Events>

1
<?xml version="1.0" encoding="UTF-8"?>
2
<MergedEvents xmlns:f1="https://xml.anka2.top/file1"
3
              xmlns:f2="https://xml.anka2.top/file2">
4
    <f1:Events>
5
        <f1:Event>
6
            <f1:title>Registration Event</f1:title>
7
            <f1:date>Oct 10, 2023</f1:date>
8
        </f1:Event>
9
    </f1:Events>
10

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    <f2:Events>
12
        <f2:Event>
13
            <f2:title>Books-Signing Event</f2:title>
14
            <f2:date>Oct 15, 2023</f2:date>
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        </f2:Event>
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    </f2:Events>
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</MergedEvents>