XS:键,为什么当键值不是密钥参考的成员时验证传递?
-
30-09-2019 - |
题
我有兴趣定义XSD中的关键约束。 我的理解是使用 xs:key
应将用于参考值列表成员的值限制。
假设我们正在使用示例XSD,
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="namespace1"
xmlns:r="namespace1"
elementFormDefault="qualified">
<xs:element name="root">
<xs:complexType>
<xs:sequence>
<xs:element name="A" type="r:A" maxOccurs="unbounded">
<xs:keyref name="dummy" refer="r:pNumKey">
<xs:selector xpath="part"/>
<xs:field xpath="@ref-number"/>
</xs:keyref>
</xs:element>
<xs:element name="B" type="r:B"/>
</xs:sequence>
</xs:complexType>
<xs:key name="pNumKey">
<xs:selector xpath="r:B/r:part"/>
<xs:field xpath="@key-number"/>
</xs:key>
</xs:element>
<xs:complexType name="A">
<xs:sequence>
<xs:element name="part" maxOccurs="unbounded">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="ref-number" type="xs:integer"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="B">
<xs:sequence>
<xs:element name="part" maxOccurs="unbounded">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="key-number" type="xs:integer"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:schema>
样品XML,
<root xmlns="namespace1">
<A>
<!--
if the ref-number is not equal to one of the key-number,
the validation will give error
-->
<part ref-number="1"/>
</A>
<A>
<!--
if the ref-number is not equal to one of the key-number,
the validation will give error
-->
<part ref-number="2"/>
</A>
<B>
<part key-number="1"/>
<part key-number="2"/>
<part key-number="3"/>
</B>
</root>
而且,一些简单的验证
[TestMethod]
public void Test_Schema()
{
string schemaFileName = @"sampleSchema.xsd";
string xmlFileName = @"sampleXml.xml";
XmlReaderSettings settings = new XmlReaderSettings
{
ValidationType = ValidationType.Schema,
ValidationFlags =
XmlSchemaValidationFlags.ProcessInlineSchema |
XmlSchemaValidationFlags.ProcessSchemaLocation |
XmlSchemaValidationFlags.ReportValidationWarnings,
};
settings.Schemas.Add (schema);
settings.ValidationEventHandler +=
(o, e) => { throw new Exception("CRASH"); };
XmlSchema schema =
XmlSchema.Read (
File.OpenText (schemaFileName),
(o, e) => { throw new Exception ("BOOM"); });
XmlReader reader = XmlReader.Create (xmlFileName, settings);
while (reader.Read ()) { }
}
如何使用不良值 A/part[@ref-number]
?
<root xmlns="namespace1">
<A>
<!-- doesn't go CRASH BOOM bang! why not? :( -->
<part ref-number="5"/>
</A>
<B>
<part key-number="1"/>
<part key-number="2"/>
<part key-number="3"/>
</B>
</root>
上方是否有任何一个或全部XSD,XML或验证?还是我误解了预期的目的 xs:key
?
解决方案
像往常 2个错误 在这个练习中。
- 第一个错误,验证身份约束是一个明确的过程,通过
XmlSchemaValidationFlags.ProcessIdentityConstraints
通过设置XmlReaderSettings.ValidationFlag
, , 和 - 第二个错误, MSDN样本 包含模式中的错误,
<xs:selector xpath="part"/>
应该读<xs:selector xpath="r:part"/>
.
完整的工作样本如下,
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="namespace1"
xmlns:r="namespace1"
elementFormDefault="qualified">
<xs:element name="root">
<xs:complexType>
<xs:sequence>
<xs:element name="A" type="r:A" maxOccurs="unbounded">
<xs:keyref name="dummy" refer="r:pNumKey">
<!-- without 'r:' below, key was not recognized, boo-urns msdn! -->
<xs:selector xpath="r:part"/>
<xs:field xpath="@ref-number"/>
</xs:keyref>
</xs:element>
<xs:element name="B" type="r:B"/>
</xs:sequence>
</xs:complexType>
<xs:key name="pNumKey">
<xs:selector xpath="r:B/r:part"/>
<xs:field xpath="@key-number"/>
</xs:key>
</xs:element>
<xs:complexType name="A">
<xs:sequence>
<xs:element name="part" maxOccurs="unbounded">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="ref-number" type="xs:integer"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="B">
<xs:sequence>
<xs:element name="part" maxOccurs="unbounded">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="key-number" type="xs:integer"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:schema>
XML样本
<root xmlns="namespace1">
<A>
<!-- goes CRASH BOOM bang! failure for the win! -->
<part ref-number="5"/>
</A>
<B>
<part key-number="1"/>
<part key-number="2"/>
<part key-number="3"/>
</B>
</root>
简单验证器
[TestMethod]
public void Test_Schema()
{
string schemaFileName = @"sampleSchema.xsd";
string xmlFileName = @"sampleXml.xml";
XmlSchema schema =
XmlSchema.Read(
File.OpenText(schemaFileName),
(o, e) => { throw new Exception("BOOM"); });
XmlReaderSettings settings = new XmlReaderSettings
{
ValidationType = ValidationType.Schema,
ValidationFlags =
XmlSchemaValidationFlags.ProcessInlineSchema |
XmlSchemaValidationFlags.ProcessSchemaLocation |
XmlSchemaValidationFlags.ReportValidationWarnings |
// d'oh! explicit flag for processing identity constraints!
XmlSchemaValidationFlags.ProcessIdentityConstraints,
};
settings.Schemas.Add(schema);
settings.ValidationEventHandler +=
(o, e) => { throw new Exception("CRASH"); };
XmlReader reader = XmlReader.Create(xmlFileName, settings);
while (reader.Read()) { }
}
其他提示
我想您应该使用验证eventhandler:
settings.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
private static void ValidationCallBack (object sender, ValidationEventArgs args) {}
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