sbol-data-io-RDF/src/main/java/org/sbolstandard/core/io/rdf/RdfIo.java
public IoWriter<QName> createIoWriter(final XMLStreamWriter writer)
  {
    return new IoWriter<QName>() {

      @Override
      public void write(DocumentRoot<QName> document) throws CoreIoException {
        try
        {
          writer.writeStartDocument();

          writeStartElement(RDF);
          setPrefix(rdf);

          if(!document.getNamespaceBindings().contains(rdf)) {
            writeNamespace(rdf);
          }

          for(NamespaceBinding nb : document.getNamespaceBindings()) {
            setPrefix(nb);
            writeNamespace(nb);
          }

          for (TopLevelDocument<QName> child : document.getTopLevelDocuments())
          {
            write(child);
          }

          writer.writeEndElement();
          writer.writeEndDocument();
        }
        catch(XMLStreamException xse)
        {
          throw new CoreIoException(xse);
        }

      }

      private void write(IdentifiableDocument<QName> doc) throws XMLStreamException {
        writeStartElement(doc.getType());
        writeAttribute(rdfAbout, doc.getIdentity().toString());

        for (NamedProperty<QName> property : doc.getProperties()) {
          write(property);
        }

        writer.writeEndElement();
      }

      private void write(final NamedProperty<QName> property) {
        new PropertyValue.Visitor<QName>() {
          @Override
          public void visit(NestedDocument<QName> v) throws XMLStreamException {
            writeStartElement(property.getName());
            write(v);
            writer.writeEndElement();
          }

          @Override
          public void visit(Literal<QName> v) throws XMLStreamException {
            if(isEmptyElementValue(v)) {
              writeEmptyElement(property.getName());
              write(v);
            } else {
              writeStartElement(property.getName());
              write(v);
              writer.writeEndElement();
            }
          }
        }.visit(property.getValue());
      }

      private boolean isEmptyElementValue(Literal<QName> literal) {
        return /* literal instanceof Literal.QNameLiteral || */ literal instanceof Literal.UriLiteral;
      }

      private void write(Literal<QName> literal) {
        new Literal.Visitor<QName>() {
          @Override
          public void visit(Literal.StringLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue());
          }

          @Override
          public void visit(Literal.UriLiteral<QName> l) throws XMLStreamException {
            writeAttribute(rdfResource, l.getValue().toString());
          }

          @Override
          public void visit(Literal.IntegerLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue().toString());
          }

          @Override
          public void visit(Literal.DoubleLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue().toString());
          }

          @Override
          public void visit(Literal.TypedLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue() + "^^" + l.getType().getPrefix() + ":" + l.getType().getLocalPart());
          }

          @Override
          public void visit(Literal.BooleanLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue().toString());
          }
        }.visit(literal);
      }

      private void writeEmptyElement(QName tagName) throws XMLStreamException {
        writer.writeEmptyElement(tagName.getPrefix(), tagName.getLocalPart(), tagName.getNamespaceURI());
      }

      private void writeStartElement(QName tagName) throws XMLStreamException {
        writer.writeStartElement(tagName.getPrefix(), tagName.getLocalPart(), tagName.getNamespaceURI());
      }

      private void setPrefix(NamespaceBinding binding) throws XMLStreamException {
        writer.setPrefix(binding.getPrefix(), binding.getNamespaceURI());
      }

      private void writeNamespace(NamespaceBinding binding) throws XMLStreamException {
        writer.writeNamespace(binding.getPrefix(), binding.getNamespaceURI());
      }

      private void writeAttribute(QName attrName, String attrValue) throws XMLStreamException {
        writer.writeAttribute(
                attrName.getPrefix(),
                attrName.getNamespaceURI(),
                attrName.getLocalPart(),
                attrValue);
      }

    };
  }
public IoWriter<QName> createIoWriter(final XMLStreamWriter writer)
  {
    return new IoWriter<QName>() {

      @Override
      public void write(DocumentRoot<QName> document) throws CoreIoException {
        try
        {
          writer.writeStartDocument();

          writeStartElement(RDF);
          setPrefix(rdf);

          if(!document.getNamespaceBindings().contains(rdf)) {
            writeNamespace(rdf);
          }

          for(NamespaceBinding nb : document.getNamespaceBindings()) {
            setPrefix(nb);
            writeNamespace(nb);
          }

          for (TopLevelDocument<QName> child : document.getTopLevelDocuments())
          {
            write(child);
          }

          writer.writeEndElement();
          writer.writeEndDocument();
        }
        catch(XMLStreamException xse)
        {
          throw new CoreIoException(xse);
        }

      }

      private void write(IdentifiableDocument<QName> doc) throws XMLStreamException {
        writeStartElement(doc.getType());
        writeAttribute(rdfAbout, doc.getIdentity().toString());

        for (NamedProperty<QName> property : doc.getProperties()) {
          write(property);
        }

        writer.writeEndElement();
      }

      private void write(final NamedProperty<QName> property) {
        new PropertyValue.Visitor<QName>() {
          @Override
          public void visit(NestedDocument<QName> v) throws XMLStreamException {
            writeStartElement(property.getName());
            write(v);
            writer.writeEndElement();
          }

          @Override
          public void visit(Literal<QName> v) throws XMLStreamException {
            if(isEmptyElementValue(v)) {
              writeEmptyElement(property.getName());
              write(v);
            } else {
              writeStartElement(property.getName());
              write(v);
              writer.writeEndElement();
            }
          }
        }.visit(property.getValue());
      }

      private boolean isEmptyElementValue(Literal<QName> literal) {
        return /* literal instanceof Literal.QNameLiteral || */ literal instanceof Literal.UriLiteral;
      }

      private void write(Literal<QName> literal) {
        new Literal.Visitor<QName>() {
          @Override
          public void visit(Literal.StringLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue());
          }

          @Override
          public void visit(Literal.UriLiteral<QName> l) throws XMLStreamException {
            writeAttribute(rdfResource, l.getValue().toString());
          }

          @Override
          public void visit(Literal.IntegerLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue().toString());
          }

          @Override
          public void visit(Literal.DoubleLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue().toString());
          }

          @Override
          public void visit(Literal.TypedLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue() + "^^" + l.getType().getPrefix() + ":" + l.getType().getLocalPart());
          }

          @Override
          public void visit(Literal.BooleanLiteral<QName> l) throws XMLStreamException {
            writer.writeCharacters(l.getValue().toString());
          }
        }.visit(literal);
      }

      private void writeEmptyElement(QName tagName) throws XMLStreamException {
        writer.writeEmptyElement(tagName.getPrefix(), tagName.getLocalPart(), tagName.getNamespaceURI());
      }

      private void writeStartElement(QName tagName) throws XMLStreamException {
        writer.writeStartElement(tagName.getPrefix(), tagName.getLocalPart(), tagName.getNamespaceURI());
      }

      private void setPrefix(NamespaceBinding binding) throws XMLStreamException {
        writer.setPrefix(binding.getPrefix(), binding.getNamespaceURI());
      }

      private void writeNamespace(NamespaceBinding binding) throws XMLStreamException {
        writer.writeNamespace(binding.getPrefix(), binding.getNamespaceURI());
      }

      private void writeAttribute(QName attrName, String attrValue) throws XMLStreamException {
        writer.writeAttribute(
                attrName.getPrefix(),
                attrName.getNamespaceURI(),
                attrName.getLocalPart(),
                attrValue);
      }

    };
  }
public IoWriter < QName > createIoWriter ( final XMLStreamWriter writer ) { return new IoWriter < QName > ( ) { @ Override public void write ( DocumentRoot < QName > document ) throws CoreIoException { try { writer . writeStartDocument ( ) ; writeStartElement ( RDF ) ; setPrefix ( rdf ) ; if ( ! document . getNamespaceBindings ( ) . contains ( rdf ) ) { writeNamespace ( rdf ) ; } for ( NamespaceBinding nb : document . getNamespaceBindings ( ) ) { setPrefix ( nb ) ; writeNamespace ( nb ) ; } for ( TopLevelDocument < QName > child : document . getTopLevelDocuments ( ) ) { write ( child ) ; } writer . writeEndElement ( ) ; writer . writeEndDocument ( ) ; } catch ( XMLStreamException xse ) { throw new CoreIoException ( xse ) ; } } private void write ( IdentifiableDocument < QName > doc ) throws XMLStreamException { writeStartElement ( doc . getType ( ) ) ; writeAttribute ( rdfAbout , doc . getIdentity ( ) . toString ( ) ) ; for ( NamedProperty < QName > property : doc . getProperties ( ) ) { write ( property ) ; } writer . writeEndElement ( ) ; } private void write ( final NamedProperty < QName > property ) { new PropertyValue . Visitor < QName > ( ) { @ Override public void visit ( NestedDocument < QName > v ) throws XMLStreamException { writeStartElement ( property . getName ( ) ) ; write ( v ) ; writer . writeEndElement ( ) ; } @ Override public void visit ( Literal < QName > v ) throws XMLStreamException { if ( isEmptyElementValue ( v ) ) { writeEmptyElement ( property . getName ( ) ) ; write ( v ) ; } else { writeStartElement ( property . getName ( ) ) ; write ( v ) ; writer . writeEndElement ( ) ; } } } . visit ( property . getValue ( ) ) ; } private boolean isEmptyElementValue ( Literal < QName > literal ) { return /* literal instanceof Literal.QNameLiteral || */ literal instanceof Literal . UriLiteral ; } private void write ( Literal < QName > literal ) { new Literal . Visitor < QName > ( ) { @ Override public void visit ( Literal . StringLiteral < QName > l ) throws XMLStreamException { writer . writeCharacters ( l . getValue ( ) ) ; } @ Override public void visit ( Literal . UriLiteral < QName > l ) throws XMLStreamException { writeAttribute ( rdfResource , l . getValue ( ) . toString ( ) ) ; } @ Override public void visit ( Literal . IntegerLiteral < QName > l ) throws XMLStreamException { writer . writeCharacters ( l . getValue ( ) . toString ( ) ) ; } @ Override public void visit ( Literal . DoubleLiteral < QName > l ) throws XMLStreamException { writer . writeCharacters ( l . getValue ( ) . toString ( ) ) ; } @ Override public void visit ( Literal . TypedLiteral < QName > l ) throws XMLStreamException { writer . writeCharacters ( l . getValue ( ) + "^^" + l . getType ( ) . getPrefix ( ) + ":" + l . getType ( ) . getLocalPart ( ) ) ; } @ Override public void visit ( Literal . BooleanLiteral < QName > l ) throws XMLStreamException { writer . writeCharacters ( l . getValue ( ) . toString ( ) ) ; } } . visit ( literal ) ; } private void writeEmptyElement ( QName tagName ) throws XMLStreamException { writer . writeEmptyElement ( tagName . getPrefix ( ) , tagName . getLocalPart ( ) , tagName . getNamespaceURI ( ) ) ; } private void writeStartElement ( QName tagName ) throws XMLStreamException { writer . writeStartElement ( tagName . getPrefix ( ) , tagName . getLocalPart ( ) , tagName . getNamespaceURI ( ) ) ; } private void setPrefix ( NamespaceBinding binding ) throws XMLStreamException { writer . setPrefix ( binding . getPrefix ( ) , binding . getNamespaceURI ( ) ) ; } private void writeNamespace ( NamespaceBinding binding ) throws XMLStreamException { writer . writeNamespace ( binding . getPrefix ( ) , binding . getNamespaceURI ( ) ) ; } private void writeAttribute ( QName attrName , String attrValue ) throws XMLStreamException { writer . writeAttribute ( attrName . getPrefix ( ) , attrName . getNamespaceURI ( ) , attrName . getLocalPart ( ) , attrValue ) ; } } ; }
Creates an {@link IoWriter} using the given {@link XMLStreamWriter} object.

<p>This {@link IoWriter} provides a method to write {@link DocumentRoot} objects in RDF/XML format.
During the serialisation, the RDF namespace is added if it is not provided in the {@link NamespaceBinding}s property of a {@link DocumentRoot}.
</p>
@param writer The {@link XMLStreamWriter} writer to serialise a {@link DocumentRoot}.
@return {@link IoWriter}
Creates an { @link IoWriter } using the given { @link XMLStreamWriter } object .