如何在 saxon api (.net) 中启用模式验证
How to enable schema validation in saxon api (.net)
我已经为 dotnet 下载了最新的 9ee 版本的 saxon api。
我有一个简单的程序可以从 xslt 转换 xml。
它适用于简单的 xslts,但我似乎看不到如何启用模式验证(xslt 文档)。
这是我的 C#(感谢 )
public static string TransformXml(string xmlData, string xslData)
{
var xsltProcessor = new Processor(true);
var documentBuilder = xsltProcessor.NewDocumentBuilder();
documentBuilder.BaseUri = new Uri("file://");
var xdmNode = documentBuilder.Build(new StringReader(xmlData));
var xsltCompiler = xsltProcessor.NewXsltCompiler();
var xsltExecutable = xsltCompiler.Compile(new StringReader(xslData));
var xsltTransformer = xsltExecutable.Load();
xsltTransformer.InitialContextNode = xdmNode;
var results = new XdmDestination();
xsltTransformer.Run(results);
return results.XdmNode.OuterXml;
}
这是我的 xslt(主要取自“掌握 xslt”Doug Tidwell)
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0">
<xsl:output method="text" />
<xsl:import-schema schema-location="file:///C:/Users/m_r_n/source/repos/SaxonEEExample/ValidateXslt/po1.xsd" />
<xsl:template match="schema-element(PurchaseOrder)">
<xsl:for-each select="item">
<xsl:value-of select="@id" />: <xsl:value-of select="title" />
<xsl:text>
</xsl:text>
</xsl:for-each>
</xsl:template>
<xsl:template match="*">
<xsl:message terminate="yes">Source document is not a purchase order
</xsl:message>
</xsl:template>
</xsl:stylesheet>
当我 运行 它时,我得到
“源文件不是采购订单”......
如果我删除“模式元素”功能,那么我会得到所需的
100: Water for Elephants
101: Glass Castle: A Memoir
200: 5 Amp Electric plug
我的直觉是 xslt 是正确的,但我在 API 上遗漏了一些设置(为了公平起见,撒克逊示例,不包括此类内容)
编辑
实际上,老实说,我希望能够做两件事,1 根据输入模式(导入模式)验证 xslt 并使用这些构造针对 xslt 执行 XSLT,作为 2 个单独的操作。
编辑
所以在评论中采纳 Michael Kay 的反馈。
我已经回到撒克逊示例,并借用了验证器示例。
我没有验证实例文档,而是尝试验证 XSLT 本身。
var samplesDir = new Uri(AppDomain.CurrentDomain.BaseDirectory);
Processor processor = new Processor(true);
processor.SetProperty("http://saxon.sf.net/feature/timing", "true");
processor.SetProperty("http://saxon.sf.net/feature/validation-warnings", "false"); //Set to true to suppress the exception
SchemaManager manager = processor.SchemaManager;
manager.XsdVersion = "1.1";
manager.ErrorList = new List<StaticError>();
Uri schemaUri = new Uri(samplesDir, "po1.xsd");
try
{
manager.Compile(schemaUri);
}
catch (Exception e)
{
Console.WriteLine(e);
Console.WriteLine("Schema compilation failed with " + manager.ErrorList.Count + " errors");
foreach (StaticError error in manager.ErrorList)
{
Console.WriteLine("At line " + error.LineNumber + ": " + error.Message);
}
return;
}
// Use this to validate an instance document
SchemaValidator validator = manager.NewSchemaValidator();
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Ignore;
String inputFileName = new Uri(samplesDir, "po.xsl").ToString();
XmlReader xmlReader = XmlReader.Create(inputFileName, settings);
validator.SetSource(xmlReader);
Console.WriteLine("Validating input file " + inputFileName);
validator.ErrorList = new List<ValidationFailure>();
XdmDestination psvi = new XdmDestination();
validator.SetDestination(psvi);
try
{
validator.Run();
}
catch (Exception e)
{
Console.WriteLine(e);
Console.WriteLine("Instance validation failed with " + validator.ErrorList.Count + " errors");
foreach (ValidationFailure error in validator.ErrorList)
{
Console.WriteLine("At line " + error.GetLineNumber() + ": " + error.GetMessage());
}
return;
}
控制台上的结果是
Loading schema document file:///C:/Users/m_r_n/source/repos/SaxonEEExample/ValidateXslt/bin/Debug/po1.xsd
Using parser org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser
Found registry key at HKEY_LOCAL_MACHINE\Software\Saxonica\SaxonEE-N\Settings
Software installation path: c:\Program Files\Saxon\SaxonEE9.9N
Finished loading schema document file:///C:/Users/m_r_n/source/repos/SaxonEEExample/ValidateXslt/bin/Debug/po1.xsd
Validating input file file:///C:/Users/m_r_n/source/repos/SaxonEEExample/ValidateXslt/bin/Debug/po.xsl
One validation error was reported: Cannot validate <Q{.../Transform}stylesheet>: no element declaration available
Instance validation failed with 1 errors
At line 2: Cannot validate <Q{.../Transform}stylesheet>: no element declaration available
有两种方法。
您可以使用 xsl:import-schema
来加载架构,但是只有 XSLT 处理器知道架构,因此需要在 XSLT 的控制下构建和验证输入文档。如果您在 XsltTransformer
上设置 SchemaValidationMode
,并将输入作为未解析的 Stream
提供给 XsltTransformer
,那么它将使用架构验证进行解析。
另一种方法是像您一样使用 DocumentBuilder
,并确保它进行验证。为此,您需要使用 SchemaManager.Compile 加载架构,然后从该架构创建一个 SchemaValidator
,并将其提供给 DocumentBuilder
.
公平地说,Michael Kay 回答了这个问题,我只是为了完整性而提出这个问题,这几乎是最小的例子。
如果 XSLT 引用了架构中未引用的无效节点(我使用了“PurchaseOrder1”),这将在“编译”期间失败(有例外)。
var samplesDir = new Uri(AppDomain.CurrentDomain.BaseDirectory);
// Create a Processor instance.
Processor processor = new Processor(true);
// Create a transformer for the stylesheet.
//Xslt30Transformer transformer = processor.NewXsltCompiler().Compile(new Uri(samplesDir, "poNoValidation.xsl")).Load30();
Xslt30Transformer transformer = processor.NewXsltCompiler().Compile(new Uri(samplesDir, "po.xsl")).Load30();
// Create a serializer, with output to the standard output stream
Serializer serializer = processor.NewSerializer();
serializer.SetOutputWriter(Console.Out);
// Transform the source XML and serialize the result document
transformer.SchemaValidationMode = SchemaValidationMode.Strict;
transformer.ApplyTemplates(File.OpenRead("po.xml"), serializer);
我已经为 dotnet 下载了最新的 9ee 版本的 saxon api。 我有一个简单的程序可以从 xslt 转换 xml。 它适用于简单的 xslts,但我似乎看不到如何启用模式验证(xslt 文档)。
这是我的 C#(感谢
public static string TransformXml(string xmlData, string xslData)
{
var xsltProcessor = new Processor(true);
var documentBuilder = xsltProcessor.NewDocumentBuilder();
documentBuilder.BaseUri = new Uri("file://");
var xdmNode = documentBuilder.Build(new StringReader(xmlData));
var xsltCompiler = xsltProcessor.NewXsltCompiler();
var xsltExecutable = xsltCompiler.Compile(new StringReader(xslData));
var xsltTransformer = xsltExecutable.Load();
xsltTransformer.InitialContextNode = xdmNode;
var results = new XdmDestination();
xsltTransformer.Run(results);
return results.XdmNode.OuterXml;
}
这是我的 xslt(主要取自“掌握 xslt”Doug Tidwell)
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0">
<xsl:output method="text" />
<xsl:import-schema schema-location="file:///C:/Users/m_r_n/source/repos/SaxonEEExample/ValidateXslt/po1.xsd" />
<xsl:template match="schema-element(PurchaseOrder)">
<xsl:for-each select="item">
<xsl:value-of select="@id" />: <xsl:value-of select="title" />
<xsl:text>
</xsl:text>
</xsl:for-each>
</xsl:template>
<xsl:template match="*">
<xsl:message terminate="yes">Source document is not a purchase order
</xsl:message>
</xsl:template>
</xsl:stylesheet>
当我 运行 它时,我得到 “源文件不是采购订单”......
如果我删除“模式元素”功能,那么我会得到所需的
100: Water for Elephants
101: Glass Castle: A Memoir
200: 5 Amp Electric plug
我的直觉是 xslt 是正确的,但我在 API 上遗漏了一些设置(为了公平起见,撒克逊示例,不包括此类内容)
编辑
实际上,老实说,我希望能够做两件事,1 根据输入模式(导入模式)验证 xslt 并使用这些构造针对 xslt 执行 XSLT,作为 2 个单独的操作。
编辑
所以在评论中采纳 Michael Kay 的反馈。
我已经回到撒克逊示例,并借用了验证器示例。
我没有验证实例文档,而是尝试验证 XSLT 本身。
var samplesDir = new Uri(AppDomain.CurrentDomain.BaseDirectory);
Processor processor = new Processor(true);
processor.SetProperty("http://saxon.sf.net/feature/timing", "true");
processor.SetProperty("http://saxon.sf.net/feature/validation-warnings", "false"); //Set to true to suppress the exception
SchemaManager manager = processor.SchemaManager;
manager.XsdVersion = "1.1";
manager.ErrorList = new List<StaticError>();
Uri schemaUri = new Uri(samplesDir, "po1.xsd");
try
{
manager.Compile(schemaUri);
}
catch (Exception e)
{
Console.WriteLine(e);
Console.WriteLine("Schema compilation failed with " + manager.ErrorList.Count + " errors");
foreach (StaticError error in manager.ErrorList)
{
Console.WriteLine("At line " + error.LineNumber + ": " + error.Message);
}
return;
}
// Use this to validate an instance document
SchemaValidator validator = manager.NewSchemaValidator();
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Ignore;
String inputFileName = new Uri(samplesDir, "po.xsl").ToString();
XmlReader xmlReader = XmlReader.Create(inputFileName, settings);
validator.SetSource(xmlReader);
Console.WriteLine("Validating input file " + inputFileName);
validator.ErrorList = new List<ValidationFailure>();
XdmDestination psvi = new XdmDestination();
validator.SetDestination(psvi);
try
{
validator.Run();
}
catch (Exception e)
{
Console.WriteLine(e);
Console.WriteLine("Instance validation failed with " + validator.ErrorList.Count + " errors");
foreach (ValidationFailure error in validator.ErrorList)
{
Console.WriteLine("At line " + error.GetLineNumber() + ": " + error.GetMessage());
}
return;
}
控制台上的结果是
Loading schema document file:///C:/Users/m_r_n/source/repos/SaxonEEExample/ValidateXslt/bin/Debug/po1.xsd
Using parser org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser
Found registry key at HKEY_LOCAL_MACHINE\Software\Saxonica\SaxonEE-N\Settings
Software installation path: c:\Program Files\Saxon\SaxonEE9.9N
Finished loading schema document file:///C:/Users/m_r_n/source/repos/SaxonEEExample/ValidateXslt/bin/Debug/po1.xsd
Validating input file file:///C:/Users/m_r_n/source/repos/SaxonEEExample/ValidateXslt/bin/Debug/po.xsl
One validation error was reported: Cannot validate <Q{.../Transform}stylesheet>: no element declaration available
Instance validation failed with 1 errors
At line 2: Cannot validate <Q{.../Transform}stylesheet>: no element declaration available
有两种方法。
您可以使用 xsl:import-schema
来加载架构,但是只有 XSLT 处理器知道架构,因此需要在 XSLT 的控制下构建和验证输入文档。如果您在 XsltTransformer
上设置 SchemaValidationMode
,并将输入作为未解析的 Stream
提供给 XsltTransformer
,那么它将使用架构验证进行解析。
另一种方法是像您一样使用 DocumentBuilder
,并确保它进行验证。为此,您需要使用 SchemaManager.Compile 加载架构,然后从该架构创建一个 SchemaValidator
,并将其提供给 DocumentBuilder
.
公平地说,Michael Kay 回答了这个问题,我只是为了完整性而提出这个问题,这几乎是最小的例子。
如果 XSLT 引用了架构中未引用的无效节点(我使用了“PurchaseOrder1”),这将在“编译”期间失败(有例外)。
var samplesDir = new Uri(AppDomain.CurrentDomain.BaseDirectory);
// Create a Processor instance.
Processor processor = new Processor(true);
// Create a transformer for the stylesheet.
//Xslt30Transformer transformer = processor.NewXsltCompiler().Compile(new Uri(samplesDir, "poNoValidation.xsl")).Load30();
Xslt30Transformer transformer = processor.NewXsltCompiler().Compile(new Uri(samplesDir, "po.xsl")).Load30();
// Create a serializer, with output to the standard output stream
Serializer serializer = processor.NewSerializer();
serializer.SetOutputWriter(Console.Out);
// Transform the source XML and serialize the result document
transformer.SchemaValidationMode = SchemaValidationMode.Strict;
transformer.ApplyTemplates(File.OpenRead("po.xml"), serializer);