xerces-c解析xml schema

一：方法名方法说明

Void SetDoSchema（const bool newState ）设置Parser是否处理xml文档中的schema，如果为true，则Parser还要处理xml中的schema，否则，parser不处理xml文档的schema。

Void setDoValidation ( const bool newState ) 此方法同setValidationScheme，不推荐使用。

Void setDoNamespaces ( const bool newState ) 设置Parser是否处理xml文档中的名域，如果为true,则Parser增强名域定义的约束和规则。

Void setValidationScheme (const ValSchemes newScheme ) 设置Parser利用定义的schema对xml文档进行有效性验证解析。NewScheme的值有Val_Never，Val_Auto，Val_Always，分别表示对xml文档不进行shema有效验证、自动选择是否验证、总是进行有效验证。

Usage


Here is an example how to turn on schema processing in DOMParser (default is off). Note that you must also turn on namespace support (default is off) for schema processing.

// Instantiate the DOM parser.
DOMParser parser;
parser.setDoNamespaces(true);
parser.setDoSchema(true);
parser.parse(xmlFile);

Usage in SAXParser is similar, please refer to the sample program 'samples/SAXCount/SAXCount.cpp' for further reference.

Here is an example how to turn on schema processing in SAX2XMLReader (default is on). Note that namespace must be on (default is on) as well.

SAX2XMLReader* parser = XMLReaderFactory::createXMLReader();
parser->setFeature(XMLUni::fgSAX2CoreNameSpaces, true);
parser->setFeature(XMLUni::fgXercesSchema, true);
parser->parse(xmlFile);

Review the sample file, 'samples/data/personal-schema.xml' and 'samples/data/personal.xsd' for an example of an XML Schema grammar.

Associating Schema Grammar with instance document


Schema grammars can be associated with instance documents in two ways.

Specifying Schema Grammar through method calls:


An application developer may associate schemas with instance documents through methodssetExternalSchemaLocation if they use namespaces, andsetExternalNoNamespaceSchemaLocation otherwise. (For SAX2XMLReader, use the properties: "http://apache.org/xml/properties/schema/external-schemaLocation" and "http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation")

Here is an example with no target namespace:

// Instantiate the DOM parser.
DOMParser parser;
parser.setDoNamespaces(true);
parser.setDoSchema(true);
parser.setExternalNoNamespaceSchemaLocation("personal.xsd");
parser.parse("test.xml");

// Instantiate the SAX2 XMLReader.
SAX2XMLReader* parser = XMLReaderFactory::createXMLReader();
XMLCh* propertyValue = XMLString::transcode("personal.xsd");
ArrayJanitor<XMLCh> janValue(propertyValue);

parser->setProperty(
       XMLUni::fgXercesSchemaExternalNoNameSpaceSchemaLocation,
       propertyValue);
parser.parse("test.xml");

Here is an example with a target namespace. Note that it is an error to specify a different namespace in setExternalSchemaLocation than the target namespace defined in the Schema.

// Instantiate the DOM parser.
DOMParser parser;
parser.setDoNamespaces(true);
parser.setDoSchema(true);
parser.setExternalSchemaLocation("http://my.com personal.xsd http://my2.com test2.xsd");
parser.parse("test.xml");

// Instantiate the SAX2 XMLReader.
SAX2XMLReader* parser = XMLReaderFactory::createXMLReader();
XMLCh* propertyValue = XMLString::transcode("http://my.com personal.xsd http://my2.com test2.xsd");
ArrayJanitor<XMLCh> janValue(propertyValue);

parser->setProperty(
       XMLCh XMLUni::fgXercesSchemaExternalSchemaLocation,
       propertyValue);
parser.parse("test.xml");

Specifying Schema Grammar through attributes in the instance document:


If schema grammar was not specified externally through methods, then each instance document that uses XML Schema grammars must specify the location of the grammars it uses by using an xsi:schemaLocation attribute if they use namespaces, and xsi:noNamespaceSchemaLocation attribute otherwise.

Here is an example with no target namespace:

<?xml version="1.0" encoding="UTF-8"?>
<personnel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation='personal.xsd'>
...
</personnel>

Here is an example with a target namespace. Note that it is an error to specify a different namespace in xsi:schemaLocation attribute than the target namespace defined in the Schema.

<?xml version="1.0" encoding="UTF-8"?>
<personnel xmlns="http://my.com"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://my.com personal.xsd http://my2.com test2.xsd">
...
</personnel>

摘自 w174504744

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