diff --git a/Lab 2/library.dtd b/Lab 3/library.dtd
similarity index 100%
rename from Lab 2/library.dtd
rename to Lab 3/library.dtd
diff --git a/Lab 2/library.xml b/Lab 3/library.xml
similarity index 67%
rename from Lab 2/library.xml
rename to Lab 3/library.xml
index 8aafa2a..d69bf71 100644
--- a/Lab 2/library.xml	
+++ b/Lab 3/library.xml	
@@ -1,15 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?xml-stylesheet type="text/xsl" href="library.xslt"?>
 <?xml-model href="library.dtd" type="applecation/xml-dtd"?>
-
-<library>
-  <book ISBN="978-3-16-148410-0" available="yes" publisher="Penguin" language="English">
+<library xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="library.xsd">
+    <book ISBN="978-3-16-148410-0" author="Leo Tolstoy" publisher="Penguin" language="English" available="yes">
         <title>War and Peace</title>
         <author>Leo Tolstoy</author>
         <genre>Historical</genre>
         <year>1869</year>
     </book>
-    <book ISBN="978-5-17-085410-0" available="no" language="Russian">
+    <book ISBN="978-5-17-085410-0" author="Alexander Pushkin" publisher="AST" language="Russian">
         <title>The Captain's Daughter</title>
         <author>Alexander Pushkin</author>
         <genre>Novel</genre>
@@ -21,5 +20,4 @@
         <genre>Historical novel</genre>
         <year>1844</year>
     </book>
-    <!-- Остальные книги... -->
 </library>
\ No newline at end of file
diff --git a/Lab 3/library.xsd b/Lab 3/library.xsd
new file mode 100644
index 0000000..2cbae4d
--- /dev/null
+++ b/Lab 3/library.xsd	
@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+
+    <!-- Определение элемента "library", который содержит один или более элементов "book" -->
+    <xs:element name="library">
+        <xs:complexType>
+            <xs:sequence>
+                <xs:element name="book" maxOccurs="unbounded" minOccurs="1">
+                    <xs:complexType>
+                        <xs:sequence>
+                            <xs:element name="title">
+                                <xs:simpleType>
+                                    <xs:restriction base="xs:string">
+                                        <xs:minLength value="5"/>
+                                    </xs:restriction>
+                                </xs:simpleType>
+                            </xs:element>
+                            
+                            <xs:element name="author">
+                                <xs:simpleType>
+                                    <xs:restriction base="xs:string">
+                                        <xs:minLength value="5"/>
+                                    </xs:restriction>
+                                </xs:simpleType>
+                            </xs:element>
+                          
+                           <xs:element name="genre">
+                                <xs:simpleType>
+                                    <xs:restriction base="xs:string">
+                                        <xs:enumeration value="Fiction"/>
+                                        <xs:enumeration value="Non-Fiction"/>
+                                        <xs:enumeration value="Fantasy"/>
+                                        <xs:enumeration value="Mystery"/>
+                                        <xs:enumeration value="History"/>
+                                    </xs:restriction>
+                                </xs:simpleType>
+                            </xs:element>
+                            
+                            <!-- Описание для year -->
+                            <xs:element name="year" type="xs:gYear"/>
+                            <xs:element name="era">
+                                <xs:simpleType>
+                                    <xs:restriction base="xs:string">
+                                        <xs:enumeration value="BC"/> <!-- До нашей эры -->
+                                        <xs:enumeration value="AD"/> <!-- Наша эра -->
+                                    </xs:restriction>
+                                </xs:simpleType>
+                            </xs:element>
+
+                        </xs:sequence>
+                        <xs:attribute name="ISBN">
+                            <xs:simpleType>
+                                <xs:restriction base="xs:string">
+                                    <xs:pattern value="(\d{10}|\d{13})"/> <!-- Шаблон для ISBN-10 или ISBN-13 -->
+                                </xs:restriction>
+                            </xs:simpleType>
+                        </xs:attribute>
+                        
+                        <xs:attribute name="available" type="xs:boolean" use="required" />
+                        <xs:attribute name="publisher" type="xs:string" use="optional" />
+                        <xs:attribute name="language" type="xs:string" use="optional" />
+                    </xs:complexType>
+                </xs:element>
+            </xs:sequence>
+        </xs:complexType>
+    </xs:element>
+
+</xs:schema>
\ No newline at end of file
diff --git a/Lab 2/library.xslt b/Lab 3/library.xslt
similarity index 100%
rename from Lab 2/library.xslt
rename to Lab 3/library.xslt