Simples Assim

As discussed here, XPath expressions don’t reset streams in 1.6.0, causing any evaluations but the first to succeed.

https://issues.apache.org/jira/browse/CAMEL-1337

If you are using FUSE 4.1.0.0, upgrading to 4.1.0.1 fixes the issue.

You can work around it, though:

from("jbi:endpoint:http://www.fernandoribeiro.eti.br/SampleService/SamplePort").convertBodyTo(Document.class).choice().when().xpath("/Root/Element1 = 'Value1'").to("direct:Route1").when().xpath("/Root/Element1 = 'Value2'").to("direct:Route2");

When using it, you may need to iterate through several element lists:

import org.apache.xmlbeans.XmlCursor;
...
final XmlCursor cur = el.newCursor();

cur.selectPath("declare namespace simplesassim='http://fernandoribeiro.eti.br'; simplesassim:Element1 | simplesassim:Element2");

while (cur.toNextSelection()) {
  final Object obj = cur.getObject();
  ...
}

http://xmlbeans.apache.org/docs/2.0.0/guide/conSelectingXMLwithXQueryPathXPath.html

Even though it was introduced in 2007, it ain’t supported by Apache Xalan (and therefore the JRE) yet. The only alternative seems to be Saxon-SA.

Document.xml (not pointing to the schema)

<?xml version="1.0" encoding="UTF-8"?>
<Root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <Element xsi:nil="true"/>
</Root>

Document.xml (pointing to the schema)

<?xml version="1.0" encoding="UTF-8"?>
<Root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="Schema.xsd">
    <Element xsi:nil="true"/>
</Root>

Schema.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Root">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Element" nillable="true">
          <xs:complexType/>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

Stylesheet.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/Root">
    <Root>
      <Element>
        <xsl:choose>
          <xsl:when test="nilled(Element)">0</xsl:when>
          <xsl:otherwise>1</xsl:otherwise>
        </xsl:choose>
      </Element>
    </Root>
  </xsl:template>
</xsl:stylesheet>

SaxonSASample1.java

• Doesn’t require the document to point to the location of the schema.
• Uses a transformer.

import java.io.FileReader;

import net.sf.saxon.FeatureKeys;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.xml.sax.InputSource;

import static java.lang.System.out;

import com.saxonica.SchemaAwareTransformerFactory;

public final class SaxonSample {

  public static void main(final String[] args) throws Exception {
    final SchemaAwareTransformerFactory factory = (SchemaAwareTransformerFactory) TransformerFactory.newInstance(); // ensure javax.xml.transform.TransformerFactory system property is set to com.saxonica.SchemaAwareTransformerFactory

    factory.addSchema(new StreamSource("Schema.xsd"));

    factory.setAttribute(FeatureKeys.SCHEMA_VALIDATION_MODE, "strict");

    final Transformer transformer = factory.newTransformer(new StreamSource(new FileReader("Stylesheet.xsl")));

    transformer.transform(new SAXSource(new InputSource(new FileReader("Document.xml"))), new StreamResult(out));
  }

}

SaxonSASample2.java

• Requires the document to point to the location of the schema.
• Uses a transformer.

import java.io.FileReader;

import net.sf.saxon.FeatureKeys;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.xml.sax.InputSource;

import static java.lang.System.out;

public final class SaxonSASample2 {

  public static void main(final String[] args) throws Exception {
    final TransformerFactory factory = TransformerFactory.newInstance(); // ensure javax.xml.transform.TransformerFactory system property is set to com.saxonica.SchemaAwareTransformerFactory

    factory.setAttribute(FeatureKeys.SCHEMA_VALIDATION_MODE, "strict");

    final Transformer transformer = factory.newTransformer(new StreamSource(new FileReader("Stylesheet.xsl")));

    transformer.transform(new SAXSource(new InputSource(new FileReader("Document.xml"))), new StreamResult(out));
  }

}

It doesn’t work with a DOM source because the type annotations of all elements is stripped to xs:untyped by Saxon-SA, whether they have been validated or not.

SaxonSASample3.java

• Doesn’t require the document to point to the location of the schema.
• Uses a transformer handler.

import static java.lang.System.out;

import java.io.FileReader;

import javax.xml.XMLConstants;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.ValidatorHandler;

import net.sf.saxon.FeatureKeys;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

public final class SaxonSASample3 {

  public static void main(final String[] args) throws Exception {
    final SAXParserFactory parserFactory = SAXParserFactory.newInstance();

    parserFactory.setNamespaceAware(true);

    final SAXParser parser = parserFactory.newSAXParser();

    final XMLReader reader = parser.getXMLReader();

    final SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); // ensure saxon9sa-jaxp.jar is in the classpath

    final Schema schema = schemaFactory.newSchema();

    final ValidatorHandler validatorHandler = schema.newValidatorHandler();

    final SAXTransformerFactory transformerFactory = (SAXTransformerFactory) TransformerFactory.newInstance(); // ensure javax.xml.transform.TransformerFactory is set to com.saxonica.SchewaAwareTransformerFactory

    transformerFactory.setAttribute(FeatureKeys.SCHEMA_VALIDATION_MODE, "strict");

    final TransformerHandler transformerHandler = transformerFactory.newTransformerHandler(new StreamSource(new FileReader("Stylesheet.xsl")));

    transformerHandler.setResult(new StreamResult(out));

    validatorHandler.setContentHandler(transformerHandler);

    reader.setContentHandler(validatorHandler);

    reader.parse(new InputSource(new FileReader("Document.xml")));
  }

}

SaxonSASample4.java

• Requires the document to point to the location of the schema.
• Uses a transformer handler.

import static java.lang.System.out;

import java.io.FileReader;

import javax.xml.XMLConstants;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.ValidatorHandler;

import net.sf.saxon.FeatureKeys;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

public final class SaxonSASample4 {

  public static void main(final String[] args) throws Exception {
    final SAXParserFactory parserFactory = SAXParserFactory.newInstance();

    parserFactory.setNamespaceAware(true);

    final SAXParser parser = parserFactory.newSAXParser();

    final XMLReader reader = parser.getXMLReader();

    final SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); // ensure saxon9sa-jaxp.jar is in the classpath

    final Schema schema = schemaFactory.newSchema(new StreamSource(new FileReader("Schema.xsd")));

    final ValidatorHandler validatorHandler = schema.newValidatorHandler();

    final SAXTransformerFactory transformerFactory = (SAXTransformerFactory) TransformerFactory.newInstance(); // ensure javax.xml.transform.TransformerFactory is set to com.saxonica.SchemaAwareTransformerFactory

    transformerFactory.setAttribute(FeatureKeys.SCHEMA_VALIDATION_MODE, "strict");

    final TransformerHandler transformerHandler = transformerFactory.newTransformerHandler(new StreamSource(new FileReader("Stylesheet.xsl")));

    transformerHandler.setResult(new StreamResult(out));

    validatorHandler.setContentHandler(transformerHandler);

    reader.setContentHandler(validatorHandler);

    reader.parse(new InputSource(new FileReader("Document.xml")));
  }

}

You can work around in both Saxon-SA and Saxon-B by using:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xsl:template match="/Root">
    <Root>
      <Element>
        <xsl:choose>
          <xsl:when test="Element/@xsi:nil = xs:boolean('true')">0</xsl:when>
          <xsl:otherwise>1</xsl:otherwise>
        </xsl:choose>
      </Element>
    </Root>
  </xsl:template>
</xsl:stylesheet>

http://saxon.markmail.org/message/a6wbxegxr4wlfkb5?q=fn:nilled

http://books.google.com/books?id=Xw3_tzEJVEwC&pg=PA384&lpg=PA384&dq=%22/%40xsi:nil%22+nilled&source=web&ots=02NoFQjxaE&sig=wHPz1CSPi1TflVHWlzy-GfhwgYU&hl=en&sa=X&oi=book_result&resnum=7&ct=result#PPA383,M1

http://www.w3.org/TR/xmlschema-2/#boolean

Thanks to Michael for the support.

http://www.w3.org/TR/xpath-functions/

http://www.ibm.com/developerworks/xml/library/ws-tip-null.html

http://www.w3.org/TR/xpath-functions/#func-nilled

• net.sf.saxon.xpath.StandaloneContext was replaced by net.sf.saxon.sxpath.IndependentContext
• The maximum number of prefixes per URI was raised from 256 to 1023. Beware the NamePoolLimitException.

The URI of the fn namespace in Saxon-B 8.4, used in Progress Sonic ESB 7.0 and 7.5, is http://www.w3.org/2005/04/xpath-functions, if you need to declare it explicitly.

• XML
• XML Schema
  • Part 0: Primer
  • Part 1: Structures
  • Part 2: Datatypes
    
• XPath
• XQuery
• XSL
• XSLT