XML/XML Schema/import

import another XML schema

File: Data.xml
<?xml version="1.0"?>
<Books xmlns="http://www.wbex.ru"
           xmlns:xml="http://www.w3.org/XML/1998/namespace"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation=
                          "http://www.wbex.ru
                           Schema.xsd
                           http://www.w3.org/XML/1998/namespace
                           xml.xsd">
        <Book xml:lang="EN">
                <Title>title1</Title>
                <Author>author1</Author>
                <Date>1998</Date>
                <ISBN>1-11111-111-1</ISBN>
                <Publisher>publisher1</Publisher>
        </Book>
        <Book xml:lang="EN">
                <Title>title2</Title>
                <Author>author2</Author>
                <Date>1977</Date>
                <ISBN>2-222-22222-2</ISBN>
                <Publisher>publisher2</Publisher>
        </Book>
</Books>
File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.wbex.ru"
            xmlns="http://www.wbex.ru"
            elementFormDefault="qualified">
    <xsd:import namespace="http://www.w3.org/XML/1998/namespace"
                schemaLocation="xml.xsd"/>
    <xsd:element name="Books">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="Book" maxOccurs="unbounded">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="Title" type="xsd:string"/>
                            <xsd:element name="Author" type="xsd:string"/>
                            <xsd:element name="Date" type="xsd:string"/>
                            <xsd:element name="ISBN" type="xsd:string"/>
                            <xsd:element name="Publisher" type="xsd:string"/>
                        </xsd:sequence>
                        <xsd:attribute ref="xml:lang"/>
                    </xsd:complexType>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>

File:xml.xsd
<?xml version="1.0"?>
<xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace"
           xmlns:xs="http://www.w3.org/2001/XMLSchema" 
           xml:lang="en">
 <xs:attribute name="lang" type="xs:language">
 </xs:attribute>
 <xs:attribute name="space" default="preserve">
  <xs:simpleType>
   <xs:restriction base="xs:NCName">
    <xs:enumeration value="default"/>
    <xs:enumeration value="preserve"/>
   </xs:restriction>
  </xs:simpleType>
 </xs:attribute>
 <xs:attributeGroup name="specialAttrs">
  <xs:attribute ref="xml:lang"/>
  <xs:attribute ref="xml:space"/>
 </xs:attributeGroup>
</xs:schema>

import schema and elementFormDefault

File: Data.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="Books.xsl"?>
<Books xmlns="http://www.wbex.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation=
                          "http://www.wbex.ru
                           Books.xsd">
        <Book xmlns="http://www.java.org">
                <Title>title1</Title>
                <Author>author1</Author>
                <Date>1998</Date>
                <ISBN>1-11111-111-1</ISBN>
                <Publisher>publisher1</Publisher>
        </Book>
        <Book xmlns="http://www.wbex.org">
                <Title>title2</Title>
                <Author>author2</Author>
                <Date>1977</Date>
                <ISBN>2-222-22222-2</ISBN>
                <Publisher>publisher2</Publisher>
        </Book>
</Books>

File: Books.xsd
<?xml version="1.0"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
        targetNamespace="http://www.wbex.ru"
        xmlns:bk="http://www.demo2s.ru"
        elementFormDefault="qualified">
    <import namespace="http://www.demo2s.ru"
            schemaLocation="Book.xsd"/>
    <element name="Books">
        <complexType>
            <sequence>
                <element ref="bk:Book" maxOccurs="unbounded"/>
            </sequence>
        </complexType>
    </element>
</schema>
File: Book.xsd
<?xml version="1.0"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.demo2s.ru"
            elementFormDefault="qualified">
    <element name="Book">
        <complexType>
            <sequence>
                <element name="Title" type="string"/>
                <element name="Author" type="string"/>
                <element name="Date" type="gYear"/>
                <element name="ISBN" type="string"/>
                <element name="Publisher" type="string"/>
            </sequence>
        </complexType>
    </element>
</schema>

import with namespace

File: Data.xml
<?xml version="1.0"?>
<Unit xmlns="http://www.wbex.ru/unit"
      xmlns:xlink="http://www.w3.org/1999/xlink/namespace"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation=
                   "http://www.wbex.ru/unit
                    Schema.xsd">
    <myData>...</myData>
    <Mission xlink:href="https://www.wbex.ru"/>
</Unit>

File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.wbex.ru/unit"
            xmlns="http://www.wbex.ru/unit"
            xmlns:xlink="http://www.w3.org/1999/xlink/namespace"
            elementFormDefault="qualified">
    <xsd:import namespace="http://www.w3.org/1999/xlink/namespace"
                schemaLocation="xlink.xsd"/>
    <xsd:element name="Unit">
        <xsd:complexType>
             <xsd:sequence>
                 <xsd:element name="myData" type="xsd:string"/>
                 <xsd:element name="Mission"> 
                     <xsd:complexType>
                         <xsd:sequence/>
                         <xsd:attribute ref="xlink:href" use="required"/>
                     </xsd:complexType>
                 </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>

File: xlink.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.w3.org/1999/xlink/namespace"
            xmlns="http://www.w3.org/1999/xlink/namespace"
            elementFormDefault="qualified">
    <xsd:attribute name="href" type="xsd:anyURI"/>
</xsd:schema>