问题描述
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(xslt文档的)模式验证。
这是我的C#(感谢How to use XSLT 3.0 using Saxon-HE 9.8 in .NET)
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(主要来自“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 “源单据不是采购单”。...
如果我删除了“ schema-element”功能,那么我得到了想要的
100: Water for Elephants
101: Glass Castle: A Memoir
200: 5 Amp Electric plug
我的直觉是xslt是正确的,但是我缺少API上的一些设置(公平地讲,撒克逊人的例子,不要包括这种东西)
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
因此请迈克尔·凯(Michael Kay)在评论中提供反馈。
我回到了saxon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
解决方法
有两种方法。
您可以使用xsl:import-schema
加载架构,但是只有XSLT处理器知道该架构,因此需要在XSLT的控制下构建和验证输入文档。如果您在SchemaValidationMode
上设置XsltTransformer
,并将输入作为未解析的XsltTransformer
提供给Stream
,则将使用架构验证对其进行解析。
另一种方法是在执行操作时使用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SchemaValidator
,并将其提供给DocumentBuilder
。
为了公平起见,Michael Kay回答了这个问题,我只是为了完整起见,这几乎是最小的例子。
如果XSLT引用架构中未引用的无效(我使用“ PurchaseOrder1”)节点,则在“编译”期间这将失败(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);