Use triple quotes for multi line literals on all platforms

core/esmf-aspect-model-serializer/src/main/java/org/eclipse/esmf/aspectmodel/serializer/PrettyPrinter.java

@@ -299,7 +299,7 @@ private String serialize( final RDFNode rdfNode, final int indentationLevel ) {
    private String quoteValue( final String value ) {
       final int approximateSize = value.length() <= 50 ? 64 : 256;
       final StringBuilder buffer = new StringBuilder( approximateSize );
-      if ( value.contains( System.lineSeparator() ) ) {
+      if ( value.contains( "\n" ) ) {
          buffer.append( TRIPLE_QUOTE );
          final String[] lines = value.split( LINE_BREAK );
          for ( int i = 0; i < lines.length; i++ ) {

core/esmf-aspect-model-serializer/src/test/java/org/eclipse/esmf/aspectmodel/serializer/PrettyPrinterTest.java

@@ -15,9 +15,7 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
-import java.io.InputStream;
 import java.io.PrintWriter;
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
@@ -32,6 +30,7 @@
 import org.eclipse.esmf.test.TestResources;
 
 import org.apache.jena.rdf.model.Model;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
@@ -42,17 +41,27 @@ public class PrettyPrinterTest {
    void testPrettyPrinter( final TestModel testModel ) {
       final AspectModel aspectModel = TestResources.load( testModel );
       final AspectModelFile originalFile = aspectModel.files().iterator().next();
+      final String formattedModel = formatAspectModelFile( originalFile );
+      final Model prettyPrintedModel = TurtleLoader.loadTurtle( formattedModel ).get();
+      assertThat( RdfComparison.hash( originalFile.sourceModel() ).equals( RdfComparison.hash( prettyPrintedModel ) ) ).isTrue();
+   }
+
+   @Test
+   void testPrintMultiLineDescription() {
+      final AspectModel aspectModel = TestResources.load( TestAspect.ASPECT_WITH_MULTI_LINE_DESCRIPTION );
+      final AspectModelFile originalFile = aspectModel.files().iterator().next();
+      final String formattedModel = formatAspectModelFile( originalFile );
+      assertThat( formattedModel ).contains( "\"\"\"" );
+      final Model prettyPrintedModel = TurtleLoader.loadTurtle( formattedModel ).get();
+      assertThat( RdfComparison.hash( originalFile.sourceModel() ).equals( RdfComparison.hash( prettyPrintedModel ) ) ).isTrue();
+   }
 
+   private static String formatAspectModelFile( final AspectModelFile originalFile ) {
       final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
       final PrintWriter writer = new PrintWriter( buffer, false, StandardCharsets.UTF_8 );
       new PrettyPrinter( originalFile, writer ).print();
       writer.flush();
-
-      final InputStream bufferInput = new ByteArrayInputStream( buffer.toByteArray() );
-      final String formattedModel = buffer.toString( StandardCharsets.UTF_8 );
-      final Model prettyPrintedModel = TurtleLoader.loadTurtle( formattedModel ).get();
-
-      assertThat( RdfComparison.hash( originalFile.sourceModel() ).equals( RdfComparison.hash( prettyPrintedModel ) ) ).isTrue();
+      return buffer.toString( StandardCharsets.UTF_8 );
    }
 
    static Stream<Arguments> testModels() {

core/esmf-test-aspect-models/src/main/java/org/eclipse/esmf/test/TestAspect.java

@@ -95,6 +95,7 @@ public enum TestAspect implements TestModel {
    ASPECT_WITH_ENUMERATION_WITH_SEE_ATTRIBUTE,
    ASPECT_WITH_ENUM_AND_OPTIONAL_ENUM_PROPERTIES,
    ASPECT_WITH_ENUM_HAVING_NESTED_ENTITIES,
+   ASPECT_WITH_ENUM_ONLY_ONE_SEE,
    ASPECT_WITH_ERROR_COLLECTION,
    ASPECT_WITH_EVENT,
    ASPECT_WITH_EXCLUSIVE_RANGE_CONSTRAINT,
@@ -124,10 +125,11 @@ public enum TestAspect implements TestModel {
    ASPECT_WITH_MULTIPLE_ENUMERATIONS_ON_MULTIPLE_LEVELS,
    ASPECT_WITH_MULTIPLE_SEE_ATTRIBUTES,
    ASPECT_WITH_MULTI_LANGUAGE_TEXT,
+   ASPECT_WITH_MULTI_LINE_DESCRIPTION,
    ASPECT_WITH_NAMESPACE_DESCRIPTION,
    ASPECT_WITH_NESTED_ENTITY,
-   ASPECT_WITH_NESTED_ENTITY_LIST,
    ASPECT_WITH_NESTED_ENTITY_ENUMERATION_WITH_NOT_IN_PAYLOAD,
+   ASPECT_WITH_NESTED_ENTITY_LIST,
    ASPECT_WITH_NESTED_ENTITY_LIST_ENUMERATION_WITH_NOT_IN_PAYLOAD,
    ASPECT_WITH_NUMERIC_REGULAR_EXPRESSION_CONSTRAINT,
    ASPECT_WITH_NUMERIC_STRUCTURED_VALUE,
@@ -191,7 +193,6 @@ public enum TestAspect implements TestModel {
    ENTITY_INSTANCE_TEST2,
    ENTITY_INSTANCE_TEST3,
    ENTITY_INSTANCE_TEST4,
-   ASPECT_WITH_ENUM_ONLY_ONE_SEE,
 
    MODEL_WITH_BROKEN_CYCLES,
 

core/esmf-test-aspect-models/src/main/resources/valid/org.eclipse.esmf.test/1.0.0/AspectWithMultiLineDescription.ttl

@@ -0,0 +1,23 @@
+# Copyright (c) 2024 Robert Bosch Manufacturing Solutions GmbH
+#
+# See the AUTHORS file(s) distributed with this work for additional
+# information regarding authorship.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# SPDX-License-Identifier: MPL-2.0
+
+@prefix : <urn:samm:org.eclipse.esmf.test:1.0.0#> .
+@prefix samm: <urn:samm:org.eclipse.esmf.samm:meta-model:2.1.0#> .
+@prefix samm-c: <urn:samm:org.eclipse.esmf.samm:characteristic:2.1.0#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+:AspectWithMultiLineDescription a samm:Aspect ;
+   samm:description """This
+is
+a
+test"""@en ;
+   samm:properties ( ) ;
+   samm:operations ( ) .