用xerces-c来进行xml schema校验

在xerces-c的官方站点上有文章指引说明是怎样进行xml schema校验。

http://xerces.apache.org/xerces-c/schema-3.html

给出的样例代码：

// Instantiate the DOM parser.

XercesDOMParser parser;

parser.setDoNamespaces(true);

parser.setDoSchema(true);

parser.parse(xmlFile);

但。样例代码根本不起不论什么作用。

在调用XercesDOMParser::parse之前,还有两件事情要做：

１.调用XercesDOMParser::setValidationScheme来设置校验计划

parser.setValidationScheme( XercesDOMParser::Val_Auto);

或

parser.setValidationScheme( XercesDOMParser::Val_Always);

２.要调用XercesDOMParser::setErrorHandler，　当中參数必须是ErrorHandler类或子类的对象。

看以下样例

address.xml:

<?xml version="1.0" encoding="utf-8"?

>

<Address xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

 xsi:noNamespaceSchemaLocation="address.xsd">

	<Recipient>Mr. Walter C. Brown</Recipient>

	<House>good</House>

	<Street>Featherstone Street</Street>

	<Town>LONDON</Town>

	<PostCode>EC1Y 8SY</PostCode>

	<Country>UK</Country>

</Address>

address.xsd:

<?xml version="1.0" encoding="utf-8"?

>

<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">

	<xs:element name="Address">

		<xs:complexType>

			<xs:sequence>

				<xs:element name="Recipient" type="xs:string" />

				<xs:element name="House" type="xs:string" />

				<xs:element name="Street" type="xs:string" />

				<xs:element name="Town" type="xs:string" />

				<xs:element name="County" type="xs:string" minOccurs="0" />

				<xs:element name="PostCode" type="xs:unsignedInt" />

				<xs:element name="Country" minOccurs="0">

					<xs:simpleType>

						<xs:restriction base="xs:string">

							<xs:enumeration value="IN" />

							<xs:enumeration value="DE" />

							<xs:enumeration value="ES" />

							<xs:enumeration value="UK" />

							<xs:enumeration value="US" />

						</xs:restriction>

					</xs:simpleType>

				</xs:element>

			</xs:sequence>

		</xs:complexType>

	</xs:element>

</xs:schema>

new_address.cpp:

#include <stdio.h>

#include <xercesc/parsers/XercesDOMParser.hpp>

#include <xercesc/sax/SAXException.hpp>

#include <xercesc/dom/DOMException.hpp>

#include <xercesc/dom/DOMElement.hpp>

#include <xercesc/dom/DOMLSException.hpp>

#include <xercesc/sax2/DefaultHandler.hpp>

using namespace XERCES_CPP_NAMESPACE;

class SchemaErrorHandler : public DefaultHandler

{

	public:

		SchemaErrorHandler() {}

		~SchemaErrorHandler() {}

	void warning(const SAXParseException& exc)

	{

		printf( "warn in line:%lu, col:%lu, %s\n",

				exc.getLineNumber(), exc.getColumnNumber(),

				XMLString::transcode( exc.getMessage()) );

	}

    void error(const SAXParseException& exc)

	{

		printf( "error in line:%lu, col:%lu, %s\n",

				exc.getLineNumber(), exc.getColumnNumber(),

				XMLString::transcode( exc.getMessage()) );

	}

    void fatalError(const SAXParseException& exc)

	{

		printf( "fatal in line:%lu, col:%lu, %s\n",

				exc.getLineNumber(), exc.getColumnNumber(),

				XMLString::transcode( exc.getMessage()) );

	}

    void resetErrors()

	{

		printf( "nothing\n" );

	}

};

int main(int argc, char* argv[] )

{

	if ( argc < 2 )

	{

		printf( "must specify a file\n" );

		return -1;

	}

	XMLPlatformUtils::Initialize();

	XercesDOMParser parser;

	SchemaErrorHandler handler;

	try

	{

		parser.setErrorHandler( &handler );

		parser.setDoNamespaces(true);

		parser.setDoSchema(true);

		//parser.setValidationScheme( XercesDOMParser::Val_Auto);

		parser.parse( argv[1] );

	} catch ( SAXException& e )

	{

		printf( "msg:%s\n", XMLString::transcode(e.getMessage() ) );

		return -2;

	}

	catch ( XMLException& e )

	{

		printf( "code:%d, msg:%s\n", e.getCode(), XMLString::transcode( e.getMessage() ) );

		return -3;

	}

	catch (	DOMException& e )

	{

		printf( "code:%d, msg:%s\n", e.code, e.msg );

		return -4;

	}

	return 0;

}

能够看到这里的代码凝视掉了这一行：

//parser.setValidationScheme( XercesDOMParser::Val_Auto);

编译执行：

[xuzhina@localhost sample]$ g++ -g -o new_address new_address.cpp -lxerces-c

[xuzhina@localhost sample]$ ./new_address address.xml

[xuzhina@localhost sample]$ 

把

//parser.setValidationScheme( XercesDOMParser::Val_Auto);

打开，但凝视掉

parser.setErrorHandler( &handler );

编译执行：

[xuzhina@localhost sample]$ g++ -g -o new_address new_address.cpp -lxerces-c

[xuzhina@localhost sample]$ ./new_address address.xml

[xuzhina@localhost sample]$ 

把

parser.setErrorHandler( &handler );

打开，编译执行：

[xuzhina@localhost sample]$ ./new_address address.xml

error in line:8, col:31, value 'EC1Y 8SY' does not match regular expression facet '[+\-]?[0-9]+'

执行一下xmllint，对照一下结果：

[xuzhina@localhost sample]$ xmllint --schema address.xsd address.xml

<?xml version="1.0" encoding="utf-8"?>

<Address xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="address.xsd">

	<Recipient>Mr. Walter C. Brown</Recipient>

	<House>good</House>

	<Street>Featherstone Street</Street>

	<Town>LONDON</Town>

	<PostCode>EC1Y 8SY</PostCode>

	<Country>UK</Country>

</Address>

address.xml:8: element PostCode: Schemas validity error : Element 'PostCode': 'EC1Y 8SY' is not a valid value of the atomic type 'xs:unsignedInt'.

address.xml fails to validate

PS：

在xml schema中，string是兼容其他类型，比方在House标签的内容写上数字，比方４９，不管xmllint, 还是xerces都不会报这个标签的值有问题。

以前为这个问题折腾一个下午。