1. Kiểm tra tài liệu XML
ThS. Trần Minh Triết

2. XmlValidatingReader Lớp đối tượng XmlValidatingReader: Ví dụ:
public XmlValidatingReader(XmlReader);
public XmlValidatingReader(Stream, XmlNodeType, XmlParserContext);
public XmlValidatingReader(string, XmlNodeType, XmlParserContext);
Ví dụ:
XmlTextReader _coreReader = new XmlTextReader (fileName);
XmlValidatingReader reader=new XmlValidatingReader (_coreReader);

3. Kiểm tra toàn bộ tài liệu XML
private bool ValidateDocument (string fileName) {
// Initialize the validating reader
XmlTextReader _coreReader = new XmlTextReader(fileName);
XmlValidatingReader reader = new XmlValidatingReader(_coreReader);
// Prepare for validation
reader.ValidationType = ValidationType.Auto;
reader.ValidationEventHandler += new
ValidationEventHandler(MyHandler);
// Parse and validate all the nodes in the document
while (reader.Read()) {}
// Close the reader
reader.Close();
return true; }

4. Kiểm tra toàn bộ tài liệu XML (tt)
private void MyHandler ( object sender, ValidationEventArgs e) {
// Logs the error that occurred
PrintOut(e.Exception.GetType().Name, e.Message); }

5. Các loại kiểm tra
Validation Type
None
Auto
DTD
Schema
XDR

6. Phân tích cách xác định loại kiểm tra phù hợp
string GetActualValidationType
(XmlValidatingReader reader, string filename)
{ string realValidationType = "";
if (reader.ValidationType == ValidationType.Auto)
{ if (reader.NodeType == XmlNodeType.DocumentType)
realValidationType = "Auto.DTD";
else
{ if(reader.SchemaType is XmlSchemaType)
{ XmlSchemaType xst = (XmlSchemaType)
reader.SchemaType;
string xsd = Path.GetFileName(xst.SourceUri);
string doc = Path.GetFileName(filename);
if (xsd == doc)
realValidationType = "Auto.Schema.Inline";
realValidationType = "Auto.Schema.Ref ("+ xsd + ")"; }
return realValidationType;

7. Quy trình kiểm tra

8. Kiểm tra một đoạn XML public XmlValidatingReader
(Stream, XmlNodeType, XmlParserContext);
(string, XmlNodeType, XmlParserContext);

9. Giới thiệu về DTD <?xml version="1.0" ?>
<!DOCTYPE class SYSTEM "class.dtd">
<!-- Sample XML document (data_dtd.xml) using a DTD -->
<class title="Applied XML Programming for .NET"
company="DinoEsposito's Own Company"
author="Dino Esposito">
<days total="5" expandable="true">
<day id="1">XML Core Classes</day>
<day id="2">Related Technologies</day>
<day id="3">XML and ADO.NET</day>
<day id="4" optional="true">XML and Applications</day>
<day id="5" optional="true">XML Interoperability</day>
</days>
</class>

10. Giới thiệu về DTD <!ELEMENT class (days)>
<!ATTLIST class title CDATA #REQUIRED
author CDATA #IMPLIED
company CDATA #IMPLIED>
<!ENTITY % Boolean "true | false">
<!ELEMENT days (day*)>
<!ATTLIST days total CDATA #REQUIRED
expandable (%Boolean;) #REQUIRED>
<!ELEMENT day (#PCDATA)>
<!ATTLIST day id CDATA #REQUIRED
optional (%Boolean;) #IMPLIED>

11. Kiểm tra với DTD
XmlTextReader _coreReader = new XmlTextReader("data_dtd.xml");
XmlValidatingReader reader = new XmlValidatingReader(_coreReader);
reader.ValidationType = ValidationType.DTD;
reader.ValidationEventHandler += new ValidationEventHandler(MyHandler);
while (reader.Read());
private void MyHandler(object sender, ValidationEventArgs e)
{ if (e.Severity == XmlSeverityType.Error)
{ // Handle the schema exception }

12. Giới thiệu về XDR <?xml version="1.0" ?>
<!-- Sample XML document (data_xdr.xml) using XDR -->
<class xmlns="x-schema:Schema.xml"
title="Applied XML Programming for .NET"
company="Wintellect"
author="DinoE">
<days total="5" expandable="true">
<day id="1">XML Core Classes</day>
<day id="2">Related Technologies</day>
<day id="3">XML and ADO.NET</day>
<day id="4" optional="true">XML and Applications</day>
<day id="5" optional="true">XML Interoperability</day>
</days>
</class>

13. Giới thiệu về XDR <?xml version="1.0"?>
<Schema name="MyClass"
xmlns="urn:schemas-microsoft-com:xml-data"
xmlns:dt="urn:schemas-microsoft-com:datatypes">
<!-- Attribute Types -->
<AttributeType name="title" dt:type="string" />
<AttributeType name="company" dt:type="string" />
<AttributeType name="author" dt:type="string" />
<AttributeType name="total" dt:type="int" />
<AttributeType name="expandable" dt:type="enumeration"
dt:values="true false" />
<AttributeType name="optional" dt:type="enumeration"
<AttributeType name="id" dt:type="int" />

14. Giới thiệu về XDR <!-- Element Types --> <!-- CLASS -->
<ElementType name="class" content="eltOnly" model="closed" order="seq">
<element type="days" minOccurs="1" maxOccurs="1" />
<attribute type="title" required="yes" />
<attribute type="author" required="no" />
<attribute type="company" required="no" />
</ElementType>

15. Giới thiệu về XDR <!-- DAYS -->
<ElementType name="days" content="eltOnly">
<element type="day" minOccurs="1" maxOccurs="*" />
<attribute type="total" required="yes" />
<attribute type="expandable" required="no" />
</ElementType>
<!-- DAY -->
<ElementType name="day" content="textOnly">
<attribute type="id" required="yes" />
<attribute type="optional" required="no" />
</Schema>

16. Kiểm tra với XDR
XmlTextReader _coreReader = new XmlTextReader("data_xdr.xml");
XmlValidatingReader reader = new XmlValidatingReader(_coreReader);
reader.ValidationType = ValidationType.XDR;
reader.ValidationEventHandler += new ValidationEventHandler(MyHandler);
while (reader.Read());
private void MyHandler(object sender, ValidationEventArgs e)
{ if (e.Severity == XmlSeverityType.Error)
{ // Handle the schema exception }

17. Giới thiệu về Schema <?xml version="1.0"?>
<xs:schema xmlns:xs="
<xs:element name="address" type="AddressType" />
<xs:complexType name="AddressType">
<xs:sequence>
<xs:element name="street" type="xs:string" />
<xs:element name="number" type="xs:string" />
<xs:element name="city" type="xs:string" />
<xs:element name="state" type="xs:string" />
<xs:element name="zip" type="xs:string" />
</xs:sequence>
<xs:attribute name="country" type="xs:string" />
</xs:complexType>
</xs:schema>

18. Kiểm tra với Schema
XmlTextReader _coreReader = new XmlTextReader("data_xdr.xml");
XmlValidatingReader reader = new XmlValidatingReader(_coreReader);
reader.ValidationType = ValidationType.Schema;
reader.ValidationEventHandler += new ValidationEventHandler(MyHandler);
while (reader.Read());
private void MyHandler(object sender, ValidationEventArgs e)
{ if (e.Severity == XmlSeverityType.Error)
{ // Handle the schema exception }