我正在尝试通过列id属性创建一个包含行引用列的模式。以下xml和xsd将无法验证,因为无法找到该列
如何为以下XML创建架构,以便我可以从行元素引用列id:
<?xml version="1.0" encoding="ISO-8859-1" ?>
<mapping xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<rows>
<row>
<column id="123" />
<column id="124" />
</row>
<row>
<column id="123" />
<column id="124" />
</row>
</rows>
<columns>
<column id="123">
<name>Apple</name>
</column>
<column id="124">
<name>Banana</name>
</column>
</columns>
</mapping>
我的xsd看起来像这样,但它不起作用......它无法找到列引用:
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="mapping">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="rows" type="Rows" minOccurs="0" maxOccurs="1"/>
<xsd:element name="columns" type="Columns" minOccurs="0" maxOccurs="1"/>
</xsd:sequence>
</xsd:complexType>
<xsd:key name="PKeyColumn">
<xsd:selector xpath="columns/column"/>
<xsd:field xpath="@id"/>
</xsd:key>
<xsd:keyref name="FKeyColumn" refer="PKeyColumn">
<xsd:selector xpath="rows/row/column"/>
<xsd:field xpath="@id"/>
</xsd:keyref>
</xsd:element>
<xsd:complexType name="Row">
<xsd:sequence>
<xsd:element ref="column">
<xsd:complexType>
<xsd:attribute name="id" use="required" type="xsd:integer" />
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="Rows">
<xsd:sequence>
<xsd:element name="row" type="Row" minOccurs="1" maxOccurs="unbounded">
<xsd:unique name="UKeyColumn">
<xsd:selector xpath="column"/>
<xsd:field xpath="@id"/>
</xsd:unique>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="Columns">
<xsd:sequence>
<xsd:element name="column" type="Column" minOccurs="1" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="Column">
<xsd:sequence>
<xsd:element name="name" type="xsd:string" minOccurs="1" maxOccurs="1"/>
</xsd:sequence>
<xsd:attribute name="id" type="xsd:integer" />
</xsd:complexType>
</xsd:schema>
答案 0 :(得分:0)
您的架构存在一些小问题 - element ref="column"
类型中的Row
需要name
而不是ref
,而且需要maxOccurs
大于1(默认值)。
<xsd:complexType name="Row">
<xsd:sequence>
<xsd:element name="column" maxOccurs="unbounded">
一旦我修复了这些错误,这一切都会很好地验证,并且交叉引用要求(row
中提到的每个列ID必须与columns
部分中的列ID对应)才能满足key
和keyref
。