schema的详解

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/book"
    xmlns:tns="http://www.example.org/book" elementFormDefault="qualified">

    <element name="books">
        <!--复杂类型 -->
        <complexType>
            <!--序列 minOccurs:最少几个,maxOccurs:最多几个 -->
            <sequence minOccurs="1" maxOccurs="unbounded">
                <!--节点 -->
                <element name="book">
                    <complexType>
                        <sequence minOccurs="1" maxOccurs="unbounded">
                            <element name="bookname" type="string"></element>
                            <element name="price" type="int"></element>
                            <!-- 多个选一个 -->
                            <choice>
                                <element name="author" type="string"></element>
                                <element name="authors">
                                    <complexType>
                                        <sequence minOccurs="1" maxOccurs="unbounded">
                                            <element name="author" type="string"></element>
                                        </sequence>
                                    </complexType>
                                </element>
                            </choice>
                            <element name="authorinfo">
                                <complexType>
                                <!--使用all的话就不用考虑顺序的事情,但是只能出现一次  -->
                                    <all>
                                        <element name="authorname" type="string"></element>
                                        <element name="authorage" type="int"></element>
                                        <element name="address" type="string"></element>
                                    </all>
                                </complexType>
                            </element>
                        </sequence>
                        <!-- 定义属性,必须在complexType里 且sequence后-->
                        <attribute name="id" type="int" use="required" ></attribute>
                    </complexType>
                </element>
            </sequence>
        </complexType>
    </element>
</schema>