<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns="http://www.oracolo.it/i-ching"
    targetNamespace="http://www.oracolo.it/i-ching"
    elementFormDefault="qualified"
    > <!-- poichè vi è un namespace di default in i-ching, vuol dire che i child di i-ching sono tutti
        qualificati, quindi devo qualificarli con elementFormDefault -->

<xsd:element name="i-ching">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element ref="predizione" minOccurs="2" maxOccurs="64"/>
            <!-- minOccurs sarebbe 64 -->
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

<xsd:element name="predizione">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element ref="esagramma"  minOccurs="1" maxOccurs="1"/>
            <xsd:element ref="significato"  minOccurs="1" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

 <xsd:element name="esagramma">
     <xsd:complexType>
         <xsd:sequence>
             <xsd:element ref="trigramma" minOccurs="2" maxOccurs="2"/>
         </xsd:sequence>
         <xsd:attribute name="nome" type="xsd:string"/>
     </xsd:complexType>
 </xsd:element>

<xsd:element name="trigramma">
    <xsd:complexType>
        <!-- metto i bound nella sequence perchè dentro vi è una choice, allora ripeto la sequence -->
        <xsd:sequence minOccurs="3" maxOccurs="3">
            <xsd:choice>
                <xsd:element ref="yin"/>
                <xsd:element ref="yang"/>
            </xsd:choice>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

<xsd:element name="yin"/>
<xsd:element name="yang"/>

<xsd:element name="significato">
    <xsd:complexType mixed="true">
        <xsd:sequence>
            <xsd:element ref="enfasi" minOccurs="0" maxOccurs="unbounded"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

<xsd:element name="enfasi">
    <xsd:complexType mixed="true">
        <xsd:sequence>
            <xsd:element ref="enfasi" minOccurs="0" maxOccurs="unbounded"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

</xsd:schema>