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				@@ -6,33 +6,37 @@ Votre programme doit, à partir d'un nom d'auteur donné en argument, extraire l 
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				 On souhaite extraire les "article" et les "inproceedings" concernant l'auteur, ainsi que la liste de ses coauteurs. Le document résultat devra ressembler à: 
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				-    <extract> 
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				-        <name>Totor le Castor</name> 
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				-        <coauthors> 
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				-            <author>Toto</author> 
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				-            <author>Titi</author> 
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				-        </coauthors> 
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				-	<article key="abcdef"> 
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				-		<author>Totor le Castor</author> 
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				-		<author>Toto</author> 
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				-		<author>Titi</author> 
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				-		<title>Un article</title> 
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				-		<year>2018</year> 
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				-	</article> 
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				-    </extract> 
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				+```xml 
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				+<extract> 
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				+    <name>Totor le Castor</name> 
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				+    <coauthors> 
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				+        <author>Toto</author> 
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				+        <author>Titi</author> 
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				+    </coauthors> 
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				+<article key="abcdef"> 
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				+	<author>Totor le Castor</author> 
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				+	<author>Toto</author> 
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				+	<author>Titi</author> 
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				+	<title>Un article</title> 
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				+	<year>2018</year> 
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				+</article> 
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				+</extract> 
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				+``` 
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				 Le document doit respecter la DTD suivante: 
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				-    <!ELEMENT extract (name, coauthors, article*, inproceedings*)> 
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				-    <!ELEMENT name (#PCDATA)> 
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				-    <!ELEMENT coauthors (author*)> 
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				-    <!ELEMENT article (author+,title,year)*> 
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				-    <!ATTLIST article key CDATA #REQUIRED> 
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				-    <!ELEMENT inproceedings (author+,title,year)*> 
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				-    <!ATTLIST inproceedings key CDATA #REQUIRED> 
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				-    <!ELEMENT author (#PCDATA)> 
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				-    <!ELEMENT title (#PCDATA)> 
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				-    <!ELEMENT year (#PCDATA)> 
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				+```dtd 
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				+<!ELEMENT extract (name, coauthors, article*, inproceedings*)> 
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				+<!ELEMENT name (#PCDATA)> 
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				+<!ELEMENT coauthors (author*)> 
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				+<!ELEMENT article (author+,title,year)*> 
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				+<!ATTLIST article key CDATA #REQUIRED> 
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				+<!ELEMENT inproceedings (author+,title,year)*> 
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				+<!ATTLIST inproceedings key CDATA #REQUIRED> 
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				+<!ELEMENT author (#PCDATA)> 
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				+<!ELEMENT title (#PCDATA)> 
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				+<!ELEMENT year (#PCDATA)> 
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				+``` 
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				 Notez que le contenu des éléments "article" et "inproceedings" est un sous-ensemble des éléments d'origine. 
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