Using SAXON 9.5 (nuget) with Schematron

Question

I am running this code:

        string path = AppDomain.CurrentDomain.BaseDirectory;

        // Uri schemaUri = new Uri(@"file:\\" + path + @"\sch\patient.sch");
        Uri totransformEE = new Uri(@"file:\\" + path + @"\po\po-schema.sch");
        Uri transformER = new Uri(@"file:\\" + path + @"\xsl\conformance1-5.xsl");

        ///////////////////////////////
        // Crate Schemtron xslt to be applied
        ///////////////////////////////
        // Create a Processor instance.
        Processor processor = new Processor();

        // Load the source document
        XdmNode input = processor.NewDocumentBuilder().Build(totransformEE);

        // Create a transformer for the stylesheet.
        XsltTransformer transformer = processor.NewXsltCompiler().Compile(transformER).Load();

        // Set the root node of the source document to be the initial context node
        transformer.InitialContextNode = input;

        // Create a serializer
        Serializer serializer = new Serializer();
        MemoryStream st = new MemoryStream();
        serializer.SetOutputStream(st);

        // Transform the source XML to System.out.
        transformer.Run(serializer);

        st.Position = 0;
        System.IO.StreamReader rd = new System.IO.StreamReader(st);
        string xsltSchematronStylesheet = rd.ReadToEnd();

        System.Diagnostics.Debug.WriteLine(xsltSchematronStylesheet);

        // Load the source document
        Uri transformEE2 = new Uri(@"file:\\" + path + @"\po\po-bad.xml");

        var documentbuilder2 = processor.NewDocumentBuilder();
        XdmNode input2 = documentbuilder2.Build(transformEE2);

        ////// Create a transformer for the stylesheet.
        StringReader sr2 = new StringReader(xsltSchematronStylesheet);
        XsltTransformer transformer2 = processor.NewXsltCompiler().Compile(sr2).Load();

        // Set the root node of the source document to be the initial context node
        transformer2.InitialContextNode = input2;

        // Create a serializer
        Serializer serializer2 = new Serializer();
        MemoryStream st2 = new MemoryStream();
        serializer.SetOutputStream(st2);

        transformer2.MessageListener = new MyMessageListener();
        // Transform the source XML to System.out.
        transformer2.Run(serializer2);

        st2.Position = 0;
        System.IO.StreamReader rd2 = new System.IO.StreamReader(st2);
        string xsltSchematronResult = rd2.ReadToEnd();
        System.Diagnostics.Debug.WriteLine(xsltSchematronResult);

I get what appears to be an XSLT file when examining xsltSchematronStylesheet. However the stream at the end st2 has 0 length. Also, MyMessageListener.Message receives no calls (I used a break point).

I am not sure if I have bad code, bad sample files, etc. I believe my sample files are correct, but maybe I have bad ones or am missing some.

Does anyone know why no data is returned to the stream st2. If not can you direct me to a good simple sample that has all the files and works?

Answer 1

My real underlying problem was finding simple complete sample code to do Schematron in .Net. So for the next guy here is the sample I was looking for. I have tried to make this as complete as possible. If I missed something, leave a comment.

1. Create a unit test project
2. Run the Nuget Command
3. Download the Schematron files
4. Use the included classes and sch, xml files.
5. Run the test program

Nuget Saxon Commandline:

Install-Package Saxon-HE 

Download Up to date Schematron Files http://www.schematron.com/tmp/iso-schematron-xslt2.zip

UnitTest:

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.IO;

namespace SOAPonFHIR.Test
{
    [TestClass]
    public class Schematron
    {
        [TestMethod]
        public void XSLT_SAXON_Simple_Schematron2()
        {

            ///////////////////////////////
            // Transform original Schemtron  
            ///////////////////////////////
            string path = AppDomain.CurrentDomain.BaseDirectory;

            Uri schematron = new Uri(@"file:\\" + path + @"\simple\input.sch");
            Uri schematronxsl = new Uri(@"file:\\" + path + @"\xsl_2.0\iso_svrl_for_xslt2.xsl");

            Stream schematrontransform = new Test.XSLTransform().Transform(schematron, schematronxsl);

            ///////////////////////////////
            // Apply Schemtron xslt 
            ///////////////////////////////
            FileStream xmlstream = new FileStream(path + @"\simple\input.xml", FileMode.Open, FileAccess.Read, FileShare.Read);
            Stream results = new Test.XSLTransform().Transform(xmlstream, schematrontransform);

            System.Diagnostics.Debug.WriteLine("RESULTS");
            results.Position = 0;
            System.IO.StreamReader rd2 = new System.IO.StreamReader(results);
            string xsltSchematronResult = rd2.ReadToEnd();
            System.Diagnostics.Debug.WriteLine(xsltSchematronResult);

        }
    }
}

Transform Class:

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
using Saxon.Api;
using System.IO;
using System.Xml.Schema;
using System.Collections.Generic;

namespace SOAPonFHIR.Test
{
    public class XSLTransform
    {
        public Stream Transform(Uri xmluri, Uri xsluri)
        {


            // Create a Processor instance.
            Processor processor = new Processor();

            // Load the source document
            XdmNode input = processor.NewDocumentBuilder().Build(xmluri);

            // Create a transformer for the stylesheet.
            var compiler = processor.NewXsltCompiler();
            compiler.ErrorList = new System.Collections.Generic.List<Exception>();

            XsltTransformer transformer = compiler.Compile(xsluri).Load();

            if (compiler.ErrorList.Count != 0)
                throw new Exception("Exception loading xsl!");

            // Set the root node of the source document to be the initial context node
            transformer.InitialContextNode = input;

            // Create a serializer
            Serializer serializer = new Serializer();
            MemoryStream results = new MemoryStream();
            serializer.SetOutputStream(results);

            // Transform the source XML to System.out.
            transformer.Run(serializer);

            //get the string
            results.Position = 0;
            return results;


        }

        public System.IO.Stream Transform(System.IO.Stream xmlstream, System.IO.Stream xslstream)
        {

            // Create a Processor instance.
            Processor processor = new Processor();

            // Load the source document
            var documentbuilder = processor.NewDocumentBuilder();
            documentbuilder.BaseUri = new Uri("file://c:/" );
            XdmNode input = documentbuilder.Build(xmlstream);

            // Create a transformer for the stylesheet.
            var compiler = processor.NewXsltCompiler();
            compiler.ErrorList = new System.Collections.Generic.List<Exception>();
            compiler.XmlResolver = new XmlUrlResolver();
            XsltTransformer transformer = compiler.Compile(xslstream).Load();

            if (compiler.ErrorList.Count != 0)
                throw new Exception("Exception loading xsl!");

            // Set the root node of the source document to be the initial context node
            transformer.InitialContextNode = input;

            // Create a serializer
            Serializer serializer = new Serializer();
            MemoryStream results = new MemoryStream();
            serializer.SetOutputStream(results);

            // Transform the source XML to System.out.
            transformer.Run(serializer);

            //get the string
            results.Position = 0;
            return results;


        }

    }
}

Schematron File

<?xml version="1.0" encoding="utf-8"?>
<iso:schema
  xmlns="http://purl.oclc.org/dsdl/schematron" 
  xmlns:iso="http://purl.oclc.org/dsdl/schematron"
  xmlns:dp="http://www.dpawson.co.uk/ns#"
  queryBinding='xslt2'
  schemaVersion='ISO19757-3'>

  <iso:title>Test ISO schematron file. Introduction mode</iso:title>
  <iso:ns prefix='dp' uri='http://www.dpawson.co.uk/ns#'/> 

  <iso:pattern>
    <iso:rule context="chapter">

      <iso:assert
         test="title">A chapter should have a title</iso:assert>  
    </iso:rule>
  </iso:pattern>


</iso:schema>

XML File

<?xml version="1.0" encoding="utf-8" ?>
<doc>
  <chapter id="c1">
    <title>chapter title</title>  
    <para>Chapter content</para>
  </chapter>

  <chapter id="c2">
    <title>chapter 2 title</title>
    <para>Content</para>           
  </chapter>

  <chapter id="c3">
    <title>Title</title>
    <para>Chapter 3 content</para>
  </chapter>
</doc>

Results:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<svrl:schematron-output xmlns:svrl="http://purl.oclc.org/dsdl/svrl"
                        xmlns:xs="http://www.w3.org/2001/XMLSchema"
                        xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                        xmlns:saxon="http://saxon.sf.net/"
                        xmlns:schold="http://www.ascc.net/xml/schematron"
                        xmlns:iso="http://purl.oclc.org/dsdl/schematron"
                        xmlns:xhtml="http://www.w3.org/1999/xhtml"
                        xmlns:dp="http://www.dpawson.co.uk/ns#"
                        title="Test ISO schematron file. Introduction mode"
                        schemaVersion="ISO19757-3"><!--   
           
           
         -->
   <svrl:ns-prefix-in-attribute-values uri="http://www.dpawson.co.uk/ns#" prefix="dp"/>
   <svrl:active-pattern document="file:///c:/"/>
   <svrl:fired-rule context="chapter"/>
   <svrl:fired-rule context="chapter"/>
   <svrl:fired-rule context="chapter"/>
</svrl:schematron-output>

Answer 2

Resolution:

serializer.SetOutputStream(st2);

should be

serializer2.SetOutputStream(st2);