XSD : 字符内容不允许，因为内容类型为空
XSD : Character content is not allowed, because the content type is empty
我遇到了错误，
Element 'item': Character content is not allowed, because the content type is empty
当我尝试验证我的 XML 文件时。我搜索了此错误，但没有找到与我的问题相匹配的内容。
当我删除 item 元素之间的文本时它起作用了，但我必须保留文本。
这是我的 XML :
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE comics SYSTEM "comics.dtd">
<comics xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="comics.xsd">
<collections>
<series name="XIII" scriptwriter="van-hamme" artist="vance" id="xiii">
<item year="1984">Le jour du soleil noir</item>
<item year="1985">Là où va l'indien</item>
<item year="1986">Toutes les larmes de l'enfer</item>
<item year="1987">SPADS</item>
<item year="1988">Rouge total</item>
<item year="1990">Le dossier Jason Fly</item>
<item year="1990">La nuit du 3 août</item>
<item year="1991">Treize contre un</item>
<item year="1992">Pour Maria</item>
<item year="1994">El Cascador</item>
<item year="1995">Trois montres d'argent</item>
<item year="1997">Le jugement</item>
<item year="1999">The XIII Mystery : l'enquête</item>
<item year="2000">Secret défense</item>
<item year="2002">Lâchez les chiens !</item>
<item year="2004" additional="true">Traquenards et sentiments</item>
<item year="2004">Opération Montecristo</item>
<item year="2005">L'or de Maximilien</item>
<item year="2007" artist="giraud">La version irlandaise</item>
<item year="2007">Le dernier round</item>
<item year="2011" scriptwriter="sente" artist="jigounov">
Le jour du Mayflower
</item>
<item year="2012" scriptwriter="sente" artist="jigounov">L'appât</item>
<item year="2013" scriptwriter="sente" artist="jigounov">
Retour à Greenfalls
</item>
<item year="2014" scriptwriter="sente" artist="jigounov">
Le message du martyr
</item>
<item year="2016" scriptwriter="sente" artist="jigounov">
L'héritage de Jason Mac Lane
</item>
</series>
<series name="XIII Mystery" derived-from="xiii">
<item year="2008" scriptwriter="dorison" artist="meyer">
La Mangouste
</item>
<item year="2009" scriptwriter="corbeyran" artist="berthet">Irina</item>
<item year="2010" scriptwriter="yann" artist="henninot">
Little Jones
</item>
<item year="2011" scriptwriter="alcante" artist="boucq">
Colonel Amos
</item>
<item year="2012" scriptwriter="nury" artist="guerineau">
Steve Rowland
</item>
<item year="2013" scriptwriter="bollee" artist="cuzor">
Billy Stockton
</item>
<item year="2014" scriptwriter="callede" artist="vallee">
Betty Barnowsky
</item>
<item year="2015" scriptwriter="giroud" artist="wilson">
Martha Shoebridge
</item>
<item year="2015" scriptwriter="matz" artist="rossi">
Felicity Brown
</item>
<item year="2016" scriptwriter="duval" artist="rouge">Calvin Wax</item>
<item year="2017" scriptwriter="brunschwig" artist="taduc">
Jonathan Fly
</item>
<item year="2018" scriptwriter="van-hamme" artist="grenson">
Judith Warner
</item>
</series>
<series name="Alix" scriptwriter="martin" artist="martin" id="alix">
<item year="1956">Alix l'intrépide</item>
<item year="1956">Le sphinx d'or</item>
<item year="1957">L'île maudite</item>
<item year="1958">La tiare d'Oribal</item>
<item year="1959">La griffe noire</item>
<item year="1965">Les légions perdues</item>
<item year="1967">Le dernier Spartiate</item>
<item year="1968">Le tombeau étrusque</item>
<item year="1970">Le dieu sauvage</item>
<item year="1972">Iorix le grand</item>
<item year="1974">Le Prince du Nil</item>
<item year="1975">Le fils de Spartacus</item>
<item year="1977">Le spectre de Carthage</item>
<item year="1978">Les proies du volcan</item>
<item year="1980">L'enfant grec</item>
<item year="1981">La Tour de Babel</item>
<item year="1983">L'Empereur de Chine</item>
<item year="1985">Vercingétorix</item>
<item year="1986">Le cheval de Troie</item>
<item year="1996" artist="martin morales henniquiau">Ô Alexandrie</item>
<item year="1998" artist="morales henniquiau">Les Barbares</item>
<item year="2001" artist="morales henniquiau">La chute d'Icare</item>
<item year="2003" artist="morales henniquiau">Le fleuve de jade</item>
<item year="2005" artist="morales henniquiau">Roma, Roma</item>
<item year="2006" scriptwriter="martin maingoval" artist="hervan simon">
C'était à Khorsabad
</item>
<item year="2007" scriptwriter="maingoval weber martin" artist="simon">
L'Ibère
</item>
<item year="2008" scriptwriter="weber martin" artist="simon">
Le démon du Pharos
</item>
<item year="2009" scriptwriter="weber martin" artist="ferry">
La cité engloutie
</item>
<item year="2010" scriptwriter="venanzi" artist="venanzi">
Le testament de César
</item>
<item year="2011" scriptwriter="lafon" artist="simon">
La conjuration de Baal
</item>
<item year="2012" scriptwriter="corteggiani"
artist="venanzi barthelemy robin">
L'ombre de Sarapis
</item>
<item year="2013" scriptwriter="ranouil" artist="jailloux billon">
La dernière conquête
</item>
<item year="2014" scriptwriter="breda" artist="jailloux">Britannia</item>
<item year="2015" scriptwriter="breda" artist="jailloux">
Par-delà le Styx
</item>
<item year="2016" scriptwriter="valmour" artist="venanzi">
L'or de Saturne
</item>
<item year="2017" scriptwriter="breda" artist="jailloux">
Le serment du gladiateur
</item>
<item year="2018" scriptwriter="david-b" artist="albertini">
Veni Vidi Vici
</item>
</series>
<series name="Alix Senator" scriptwriter="mangin" artist="demarez"
derived-from="alix">
<item year="2012">Les aigles de sang</item>
<item year="2013">Le dernier pharaon</item>
<item year="2014">La conjuration des rapaces</item>
<item year="2015">Les démons de Sparte</item>
<item year="2016">Le hurlement de Cybèle</item>
<item year="2017">La montagne des morts</item>
<item year="2018">La puissance et l'éternité</item>
</series>
</collections>
<people>
<person id="albertini" firstname="Giorgio" lastname="Albertini"/>
<person id="alcante" pseudonym="Alcante" firstname="Didier"
lastname="Swysen" born="1970"/>
<person id="barthelemy" firstname="Mathieu" lastname="Barthelémy"/>
<person id="berthet" firstname="Philippe" lastname="Berthet" born="1956"/>
<person id="billon" firstname="Corinne" lastname="Billon"/>
<person id="bollee" firstname="Laurent-Frédéric" lastname="Bollée"
born="1967"/>
<person id="boucq" firstname="François" lastname="Boucq" born="1955"/>
<person id="breda" firstname="Mathieu" lastname="Breda"/>
<person id="brunschwig" firstname="Luc" lastname="Brunschwig" born="1967"/>
<person id="callede" firstname="Joël" lastname="Callède" born="1972"/>
<person id="corbeyran" firstname="Éric" lastname="Corbeyran" born="1964"/>
<person id="corteggiani" firstname="François" lastname="Corteggiani"
born="1953"/>
<person id="cuzor" firstname="Steve" lastname="Cuzor" born="1971"/>
<person id="david-b" pseudonym="David B." firstname="Pierre-François"
lastname="Beauchard" born="1959"/>
<person id="demarez" firstname="Thierry" lastname="Démarez" born="1971"/>
<person id="dorison" firstname="Xavier" lastname="Dorison" born="1972"/>
<person id="duval" firstname="Fred" lastname="Duval" born="1965"/>
<person id="ferry" firstname="Paschalis" lastname="Van Vosselen"
pseudonym="Ferry" born="1944"/>
<person id="giraud" firstname="Jean" lastname="Giraud" born="1938"
dead="2012"/>
<person id="giroud" firstname="Frank" lastname="Giroud" born="1956"/>
<person id="grenson" firstname="Olivier" lastname="Grenson" born="1962"/>
<person id="guerineau" firstname="Richard" lastname="Guérineau"
born="1969"/>
<person id="henninot" firstname="Éric" lastname="Henninot" born="1974"/>
<person id="henniquiau" firstname="Marc" lastname="Henniquiau"/>
<person id="hervan" firstname="Cédric" lastname="Hervan" born="1981"/>
<person id="jailloux" firstname="Marc" lastname="Jailloux"/>
<person id="jigounov" firstname="Youri" lastname="Jigounov" born="1967"/>
<person id="lafon" firstname="Michel" lastname="Lafon"/>
<person id="maingoval" firstname="François" lastname="Maingoval"
born="1975"/>
<person id="mangin" firstname="Valérie" lastname="Mangin" born="1973"/>
<person id="martin" firstname="Jacques" lastname="Martin" born="1921"
dead="2010"/>
<person id="matz" pseudonym="Matz" firstname="Alexis" lastname="Nolent"
born="1967"/>
<person id="meyer" firstname="Ralph" lastname="Meyer" born="1971"/>
<person id="morales" firstname="Rafael" lastname="Moralès"/>
<person id="nury" firstname="Fabien" lastname="Nury" born="1976"/>
<person id="ranouil" firstname="Géraldine" lastname="Ranouil"/>
<person id="robin" firstname="Véronique" lastname="Robin"/>
<person id="rossi" firstname="Christian" lastname="Rossi" born="1954"/>
<person id="rouge" firstname="Corentin" lastname="Rouge" born="1983"/>
<person id="sente" firstname="Yves" lastname="Sente" born="1964"/>
<person id="simon" firstname="Christophe" lastname="Simon" born="1974"/>
<person id="taduc" pseudonym="TaDuc" firstname="Olivier" lastname="Ta"
born="1962"/>
<person id="vallee" firstname="Sylvain" lastname="Vallée" born="1972"/>
<person id="valmour" firstname="Pierre" lastname="Valmour"/>
<person id="van-hamme" firstname="Jean" lastname="Van Hamme" born="1939"/>
<person id="vance" firstname="William" lastname="Vance" born="1935"/>
<person id="venanzi" firstname="Marco" lastname="Venanzi" born="1963"/>
<person id="weber" firstname="Patrick" lastname="Weber" born="1966"/>
<person id="wilson" firstname="Colin" lastname="Wilson" born="1949"/>
<person id="yann" pseudonym="Yann" firstname="Yann" lastname="Lepennetier"
born="1954"/>
</people>
</comics>
还有我的 XSD 文件：
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="comics">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="collections">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="series" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="item" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="year" type="xsd:gYear" use="required"/>
<xsd:attribute name="scriptwriter" type="xsd:string"/>
<xsd:attribute name="artist" type="xsd:string"/>
<xsd:attribute ref="additional"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
<xsd:attribute name="name" type="xsd:string" use="required"/>
<xsd:attribute name="scriptwriter" type="xsd:string"/>
<xsd:attribute name="artist" type="xsd:string"/>
<xsd:attribute name="id" type="xsd:string"/>
<xsd:attribute name="derived-from" type="xsd:string"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="people">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="person" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="id" type="xsd:string" use="required"/>
<xsd:attribute name="firstname" type="xsd:string" use="required"/>
<xsd:attribute name="lastname" type="xsd:string" use="required"/>
<xsd:attribute name="pseudonym" type="xsd:string"/>
<xsd:attribute name="born" type="xsd:gYear"/>
<xsd:attribute name="dead" type="xsd:gYear"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:attribute name="additional">
<xsd:simpleType>
<xsd:restriction base="xsd:boolean">
<xsd:pattern value="(true|false)"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:attribute>
</xsd:schema>
要允许 item 包含文本内容，请更改
<xsd:element name="item" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="year" type="xsd:gYear" use="required"/>
<xsd:attribute name="scriptwriter" type="xsd:string"/>
<xsd:attribute name="artist" type="xsd:string"/>
<xsd:attribute ref="additional"/>
</xsd:complexType>
</xsd:element>
到
<xsd:element name="item" maxOccurs="unbounded">
<xsd:complexType>
<xsd:simpleContent>
<xsd:extension base="xsd:string">
<xsd:attribute name="year" type="xsd:gYear" use="required"/>
<xsd:attribute name="scriptwriter" type="xsd:string"/>
<xsd:attribute name="artist" type="xsd:string"/>
<xsd:attribute ref="additional"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:complexType>
</xsd:element>
然后您的 XML 将根据您的 XSD 成功验证。
是否根据引用但未包含的 DTD 进行验证是另一回事。
我遇到了错误，
Element 'item': Character content is not allowed, because the content type is empty
当我尝试验证我的 XML 文件时。我搜索了此错误，但没有找到与我的问题相匹配的内容。
当我删除 item 元素之间的文本时它起作用了，但我必须保留文本。
这是我的 XML :
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE comics SYSTEM "comics.dtd">
<comics xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="comics.xsd">
<collections>
<series name="XIII" scriptwriter="van-hamme" artist="vance" id="xiii">
<item year="1984">Le jour du soleil noir</item>
<item year="1985">Là où va l'indien</item>
<item year="1986">Toutes les larmes de l'enfer</item>
<item year="1987">SPADS</item>
<item year="1988">Rouge total</item>
<item year="1990">Le dossier Jason Fly</item>
<item year="1990">La nuit du 3 août</item>
<item year="1991">Treize contre un</item>
<item year="1992">Pour Maria</item>
<item year="1994">El Cascador</item>
<item year="1995">Trois montres d'argent</item>
<item year="1997">Le jugement</item>
<item year="1999">The XIII Mystery : l'enquête</item>
<item year="2000">Secret défense</item>
<item year="2002">Lâchez les chiens !</item>
<item year="2004" additional="true">Traquenards et sentiments</item>
<item year="2004">Opération Montecristo</item>
<item year="2005">L'or de Maximilien</item>
<item year="2007" artist="giraud">La version irlandaise</item>
<item year="2007">Le dernier round</item>
<item year="2011" scriptwriter="sente" artist="jigounov">
Le jour du Mayflower
</item>
<item year="2012" scriptwriter="sente" artist="jigounov">L'appât</item>
<item year="2013" scriptwriter="sente" artist="jigounov">
Retour à Greenfalls
</item>
<item year="2014" scriptwriter="sente" artist="jigounov">
Le message du martyr
</item>
<item year="2016" scriptwriter="sente" artist="jigounov">
L'héritage de Jason Mac Lane
</item>
</series>
<series name="XIII Mystery" derived-from="xiii">
<item year="2008" scriptwriter="dorison" artist="meyer">
La Mangouste
</item>
<item year="2009" scriptwriter="corbeyran" artist="berthet">Irina</item>
<item year="2010" scriptwriter="yann" artist="henninot">
Little Jones
</item>
<item year="2011" scriptwriter="alcante" artist="boucq">
Colonel Amos
</item>
<item year="2012" scriptwriter="nury" artist="guerineau">
Steve Rowland
</item>
<item year="2013" scriptwriter="bollee" artist="cuzor">
Billy Stockton
</item>
<item year="2014" scriptwriter="callede" artist="vallee">
Betty Barnowsky
</item>
<item year="2015" scriptwriter="giroud" artist="wilson">
Martha Shoebridge
</item>
<item year="2015" scriptwriter="matz" artist="rossi">
Felicity Brown
</item>
<item year="2016" scriptwriter="duval" artist="rouge">Calvin Wax</item>
<item year="2017" scriptwriter="brunschwig" artist="taduc">
Jonathan Fly
</item>
<item year="2018" scriptwriter="van-hamme" artist="grenson">
Judith Warner
</item>
</series>
<series name="Alix" scriptwriter="martin" artist="martin" id="alix">
<item year="1956">Alix l'intrépide</item>
<item year="1956">Le sphinx d'or</item>
<item year="1957">L'île maudite</item>
<item year="1958">La tiare d'Oribal</item>
<item year="1959">La griffe noire</item>
<item year="1965">Les légions perdues</item>
<item year="1967">Le dernier Spartiate</item>
<item year="1968">Le tombeau étrusque</item>
<item year="1970">Le dieu sauvage</item>
<item year="1972">Iorix le grand</item>
<item year="1974">Le Prince du Nil</item>
<item year="1975">Le fils de Spartacus</item>
<item year="1977">Le spectre de Carthage</item>
<item year="1978">Les proies du volcan</item>
<item year="1980">L'enfant grec</item>
<item year="1981">La Tour de Babel</item>
<item year="1983">L'Empereur de Chine</item>
<item year="1985">Vercingétorix</item>
<item year="1986">Le cheval de Troie</item>
<item year="1996" artist="martin morales henniquiau">Ô Alexandrie</item>
<item year="1998" artist="morales henniquiau">Les Barbares</item>
<item year="2001" artist="morales henniquiau">La chute d'Icare</item>
<item year="2003" artist="morales henniquiau">Le fleuve de jade</item>
<item year="2005" artist="morales henniquiau">Roma, Roma</item>
<item year="2006" scriptwriter="martin maingoval" artist="hervan simon">
C'était à Khorsabad
</item>
<item year="2007" scriptwriter="maingoval weber martin" artist="simon">
L'Ibère
</item>
<item year="2008" scriptwriter="weber martin" artist="simon">
Le démon du Pharos
</item>
<item year="2009" scriptwriter="weber martin" artist="ferry">
La cité engloutie
</item>
<item year="2010" scriptwriter="venanzi" artist="venanzi">
Le testament de César
</item>
<item year="2011" scriptwriter="lafon" artist="simon">
La conjuration de Baal
</item>
<item year="2012" scriptwriter="corteggiani"
artist="venanzi barthelemy robin">
L'ombre de Sarapis
</item>
<item year="2013" scriptwriter="ranouil" artist="jailloux billon">
La dernière conquête
</item>
<item year="2014" scriptwriter="breda" artist="jailloux">Britannia</item>
<item year="2015" scriptwriter="breda" artist="jailloux">
Par-delà le Styx
</item>
<item year="2016" scriptwriter="valmour" artist="venanzi">
L'or de Saturne
</item>
<item year="2017" scriptwriter="breda" artist="jailloux">
Le serment du gladiateur
</item>
<item year="2018" scriptwriter="david-b" artist="albertini">
Veni Vidi Vici
</item>
</series>
<series name="Alix Senator" scriptwriter="mangin" artist="demarez"
derived-from="alix">
<item year="2012">Les aigles de sang</item>
<item year="2013">Le dernier pharaon</item>
<item year="2014">La conjuration des rapaces</item>
<item year="2015">Les démons de Sparte</item>
<item year="2016">Le hurlement de Cybèle</item>
<item year="2017">La montagne des morts</item>
<item year="2018">La puissance et l'éternité</item>
</series>
</collections>
<people>
<person id="albertini" firstname="Giorgio" lastname="Albertini"/>
<person id="alcante" pseudonym="Alcante" firstname="Didier"
lastname="Swysen" born="1970"/>
<person id="barthelemy" firstname="Mathieu" lastname="Barthelémy"/>
<person id="berthet" firstname="Philippe" lastname="Berthet" born="1956"/>
<person id="billon" firstname="Corinne" lastname="Billon"/>
<person id="bollee" firstname="Laurent-Frédéric" lastname="Bollée"
born="1967"/>
<person id="boucq" firstname="François" lastname="Boucq" born="1955"/>
<person id="breda" firstname="Mathieu" lastname="Breda"/>
<person id="brunschwig" firstname="Luc" lastname="Brunschwig" born="1967"/>
<person id="callede" firstname="Joël" lastname="Callède" born="1972"/>
<person id="corbeyran" firstname="Éric" lastname="Corbeyran" born="1964"/>
<person id="corteggiani" firstname="François" lastname="Corteggiani"
born="1953"/>
<person id="cuzor" firstname="Steve" lastname="Cuzor" born="1971"/>
<person id="david-b" pseudonym="David B." firstname="Pierre-François"
lastname="Beauchard" born="1959"/>
<person id="demarez" firstname="Thierry" lastname="Démarez" born="1971"/>
<person id="dorison" firstname="Xavier" lastname="Dorison" born="1972"/>
<person id="duval" firstname="Fred" lastname="Duval" born="1965"/>
<person id="ferry" firstname="Paschalis" lastname="Van Vosselen"
pseudonym="Ferry" born="1944"/>
<person id="giraud" firstname="Jean" lastname="Giraud" born="1938"
dead="2012"/>
<person id="giroud" firstname="Frank" lastname="Giroud" born="1956"/>
<person id="grenson" firstname="Olivier" lastname="Grenson" born="1962"/>
<person id="guerineau" firstname="Richard" lastname="Guérineau"
born="1969"/>
<person id="henninot" firstname="Éric" lastname="Henninot" born="1974"/>
<person id="henniquiau" firstname="Marc" lastname="Henniquiau"/>
<person id="hervan" firstname="Cédric" lastname="Hervan" born="1981"/>
<person id="jailloux" firstname="Marc" lastname="Jailloux"/>
<person id="jigounov" firstname="Youri" lastname="Jigounov" born="1967"/>
<person id="lafon" firstname="Michel" lastname="Lafon"/>
<person id="maingoval" firstname="François" lastname="Maingoval"
born="1975"/>
<person id="mangin" firstname="Valérie" lastname="Mangin" born="1973"/>
<person id="martin" firstname="Jacques" lastname="Martin" born="1921"
dead="2010"/>
<person id="matz" pseudonym="Matz" firstname="Alexis" lastname="Nolent"
born="1967"/>
<person id="meyer" firstname="Ralph" lastname="Meyer" born="1971"/>
<person id="morales" firstname="Rafael" lastname="Moralès"/>
<person id="nury" firstname="Fabien" lastname="Nury" born="1976"/>
<person id="ranouil" firstname="Géraldine" lastname="Ranouil"/>
<person id="robin" firstname="Véronique" lastname="Robin"/>
<person id="rossi" firstname="Christian" lastname="Rossi" born="1954"/>
<person id="rouge" firstname="Corentin" lastname="Rouge" born="1983"/>
<person id="sente" firstname="Yves" lastname="Sente" born="1964"/>
<person id="simon" firstname="Christophe" lastname="Simon" born="1974"/>
<person id="taduc" pseudonym="TaDuc" firstname="Olivier" lastname="Ta"
born="1962"/>
<person id="vallee" firstname="Sylvain" lastname="Vallée" born="1972"/>
<person id="valmour" firstname="Pierre" lastname="Valmour"/>
<person id="van-hamme" firstname="Jean" lastname="Van Hamme" born="1939"/>
<person id="vance" firstname="William" lastname="Vance" born="1935"/>
<person id="venanzi" firstname="Marco" lastname="Venanzi" born="1963"/>
<person id="weber" firstname="Patrick" lastname="Weber" born="1966"/>
<person id="wilson" firstname="Colin" lastname="Wilson" born="1949"/>
<person id="yann" pseudonym="Yann" firstname="Yann" lastname="Lepennetier"
born="1954"/>
</people>
</comics>
还有我的 XSD 文件：
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="comics">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="collections">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="series" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="item" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="year" type="xsd:gYear" use="required"/>
<xsd:attribute name="scriptwriter" type="xsd:string"/>
<xsd:attribute name="artist" type="xsd:string"/>
<xsd:attribute ref="additional"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
<xsd:attribute name="name" type="xsd:string" use="required"/>
<xsd:attribute name="scriptwriter" type="xsd:string"/>
<xsd:attribute name="artist" type="xsd:string"/>
<xsd:attribute name="id" type="xsd:string"/>
<xsd:attribute name="derived-from" type="xsd:string"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="people">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="person" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="id" type="xsd:string" use="required"/>
<xsd:attribute name="firstname" type="xsd:string" use="required"/>
<xsd:attribute name="lastname" type="xsd:string" use="required"/>
<xsd:attribute name="pseudonym" type="xsd:string"/>
<xsd:attribute name="born" type="xsd:gYear"/>
<xsd:attribute name="dead" type="xsd:gYear"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:attribute name="additional">
<xsd:simpleType>
<xsd:restriction base="xsd:boolean">
<xsd:pattern value="(true|false)"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:attribute>
</xsd:schema>
要允许 item 包含文本内容，请更改
<xsd:element name="item" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="year" type="xsd:gYear" use="required"/>
<xsd:attribute name="scriptwriter" type="xsd:string"/>
<xsd:attribute name="artist" type="xsd:string"/>
<xsd:attribute ref="additional"/>
</xsd:complexType>
</xsd:element>
到
<xsd:element name="item" maxOccurs="unbounded">
<xsd:complexType>
<xsd:simpleContent>
<xsd:extension base="xsd:string">
<xsd:attribute name="year" type="xsd:gYear" use="required"/>
<xsd:attribute name="scriptwriter" type="xsd:string"/>
<xsd:attribute name="artist" type="xsd:string"/>
<xsd:attribute ref="additional"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:complexType>
</xsd:element>
然后您的 XML 将根据您的 XSD 成功验证。
是否根据引用但未包含的 DTD 进行验证是另一回事。