Step 1: Design your API in OpenAPI

Expanded Pet Store (v3)/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Pet Store Expanded</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.xtext.ui.shared.xtextBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.modelsolv.reprezen.ui.RepreZenBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>com.modelsolv.reprezen.zenNature</nature>
+		<nature>org.eclipse.xtext.ui.shared.xtextNature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

Expanded Pet Store (v3)/gentargets/petstore-expanded/Android Client/Android Client.gen

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+---
+name: "Android Client"
+genTemplateId: "com.modelsolv.reprezen.gentemplates.openapi.generator.AndroidClientCodegen"
+relativeOutputDir: generated
+prerequisites: null
+primarySource: 
+  path: "../../../models/petstore-expanded.yaml"
+namedSources: null 
+# The parameters object contains variables that are processed directly by the GenTemplate.
+parameters: 
+  # Sort method arguments to place required parameters before optional parameters.
+  sortParamsByRequiredFlag: null
+
+  # Whether to ensure parameter names are unique in an operation (rename parameters that are not).
+  ensureUniqueParams: null
+
+  # boolean, toggles whether unicode identifiers are allowed in names or not, default is false
+  allowUnicodeIdentifiers: null
+
+  # Add form or body parameters to the beginning of the parameter list.
+  prependFormOrBodyParameters: null
+
+  # package for generated models
+  modelPackage: null
+
+  # package for generated api classes
+  apiPackage: null
+
+  # root package for generated code
+  invokerPackage: null
+
+  # groupId for use in the generated build.gradle and pom.xml
+  groupId: null
+
+  # artifactId for use in the generated build.gradle and pom.xml
+  artifactId: null
+
+  # artifact version for use in the generated build.gradle and pom.xml
+  artifactVersion: null
+
+  # source folder for generated code
+  sourceFolder: null
+
+  # A flag to toggle android-maven gradle plugin.
+  useAndroidMavenGradlePlugin: null
+
+  # gradleVersion version for use in the generated build.gradle
+  androidGradleVersion: null
+
+  # compileSdkVersion version for use in the generated build.gradle
+  androidSdkVersion: null
+
+  # buildToolsVersion version for use in the generated build.gradle
+  androidBuildToolsVersion: null
+
+  # boolean - toggle "implements Serializable" for generated models
+  serializableModel: null
+
+  # library template (sub-template) to use
+  library: null
+
+  # Contents of OpenAPI Generator configuration file.
+  # This is the file that would be passed with --config option on OpenAPI Generator commandline.
+  # The JSON contents of that file should be the value of this parameter.
+  # This parameter need not be used. If it is absent, all string-valued parameters are collected into
+  # a map that is then passed to the OpenAPI Generator module. If a map is provided here, then string-valued
+  # parameters are still copied in, overriding like-named values appearing in the map.
+  openApiCodegenConfig: null
+
+  # System properties to set, as in the -D option of OpenAPI Generatorcommand line.
+  # Each property should be a json object with a name/value pair for each property.
+  # Example: for '-Dmodels -Dapis=User,Pets' use the following:
+  # value:
+  #   models: ''
+  #   apis: Users,Pets
+  openApiCodegenSystemProperties: null

Expanded Pet Store (v3)/gentargets/petstore-expanded/Android Client/build.gradle

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+apply plugin: 'java'
+
+	repositories {
+		maven {
+			url "http://maven.reprezen.com/repository/releases"
+		}
+		maven {
+			url "http://maven.reprezen.com/repository/eclipse/"
+		}
+		mavenCentral()
+	}
+
+	dependencies {
+		compile ('com.modelsolv.reprezen:com.modelsolv.reprezen.generators.api:1.6.11.9445')
+		compile ('com.modelsolv.reprezen:com.modelsolv.reprezen.generators.xtend:1.6.11.9445') {
+		       exclude module: 'org.eclipse.equinox.bidi'
+		       exclude module: 'org.eclipse.emf.common.ui'
+		       exclude module: 'org.eclipse.e4.ui.workbench3'
+		       exclude module: 'org.apache.batik.css'
+		       exclude module: 'org.eclipse.e4.ui.css.swt'
+		}
+		compile ('com.modelsolv.reprezen:com.modelsolv.reprezen.generators.standard:1.6.11.9445')
+		compile fileTree(dir: '/Users/tanya/RepreZen/workspace/shared/GenTemplates', include: ['*.jar'])
+		compile fileTree(dir: '/Users/tanya/RepreZen/workspace/Expanded Pet Store (v3)/lib', include: ['*.jar'])
+	}
+
+	task(execGenTarget, dependsOn: 'classes', type: JavaExec) {
+		main = 'com.modelsolv.reprezen.generators.api.util.GeneratorLauncher'
+		classpath = sourceSets.main.runtimeClasspath
+		args '/Users/tanya/RepreZen/workspace/Expanded Pet Store (v3)/gentargets/petstore-expanded/Android Client/Android Client.gen'
+	}
+
+	defaultTasks 'execGenTarget' 

Expanded Pet Store (v3)/gentargets/petstore-expanded/Android Client/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.modelsolv.reprezen.generators</groupId>
+        <artifactId>expanded-pet-store--v3-</artifactId>
+        <version>1.0-SNAPSHOT</version>
+        <relativePath>../../../pom.xml</relativePath>
+    </parent>
+    <artifactId>android-client-gen</artifactId>
+    <name>GenTarget Launcher For Android Client.gen</name>
+    <packaging>pom</packaging>
+    <properties>
+        <project.lib.dir>/Users/tanya/RepreZen/workspace/Expanded Pet Store (v3)/lib</project.lib.dir>
+        <shared.gentemplates.dir>/Users/tanya/RepreZen/workspace/shared/GenTemplates</shared.gentemplates.dir>
+    </properties>
+    <build>
+    	<defaultGoal>clean generate-sources</defaultGoal>
+        <plugins>
+            <plugin>
+                <groupId>com.googlecode.addjars-maven-plugin</groupId>
+                <artifactId>addjars-maven-plugin</artifactId>
+                <version>1.0.5</version>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-jars</goal>
+                        </goals>
+                        <configuration>
+                            <resources>
+                                <resource>
+                                    <directory>${shared.gentemplates.dir}</directory>
+                                </resource>
+                                <resource>
+                                    <directory>${project.lib.dir}</directory>
+                                </resource>
+                            </resources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>1.4.0</version>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <includeProjectDependencies>true</includeProjectDependencies>
+                    <mainClass>com.modelsolv.reprezen.generators.api.util.GeneratorLauncher</mainClass>
+                    <classpathScope>compile</classpathScope>
+                    <cleanupDaemonThreads>false</cleanupDaemonThreads>
+                    <arguments>
+                        <argument>Android Client.gen</argument>
+                    </arguments>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

Expanded Pet Store (v3)/gentargets/petstore-expanded/C# Client/C# Client.gen

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+---
+name: "C# Client"
+genTemplateId: "com.modelsolv.reprezen.gentemplates.openapi.generator.CSharpClientCodegen"
+relativeOutputDir: generated
+prerequisites: null
+primarySource: 
+  path: "../../../models/petstore-expanded.yaml"
+namedSources: null 
+# The parameters object contains variables that are processed directly by the GenTemplate.
+parameters: 
+  # C# package name (convention: Title.Case).
+  packageName: null
+
+  # C# package version.
+  packageVersion: null
+
+  # source folder for generated code
+  sourceFolder: null
+
+  # The GUID that will be associated with the C# project
+  packageGuid: null
+
+  # Prefix interfaces with a community standard or widely accepted prefix.
+  interfacePrefix: null
+
+  # The target .NET framework version.
+  targetFramework: null
+
+  # Naming convention for the property: 'camelCase', 'PascalCase', 'snake_case' and 'original', which keeps the original name
+  modelPropertyNaming: null
+
+  # Hides the generation timestamp when files are generated.
+  hideGenerationTimestamp: null
+
+  # Sort method arguments to place required parameters before optional parameters.
+  sortParamsByRequiredFlag: null
+
+  # Use DateTimeOffset to model date-time properties
+  useDateTimeOffset: null
+
+  # Deserialize array types to Collection<T> instead of List<T>.
+  useCollection: null
+
+  # Return ICollection<T> instead of the concrete type.
+  returnICollection: null
+
+  # C# Optional method argument, e.g. void square(int x=10) (.net 4.0+ only).
+  optionalMethodArgument: null
+
+  # Generate AssemblyInfo.cs.
+  optionalAssemblyInfo: null
+
+  # Generate {PackageName}.csproj.
+  optionalProjectFile: null
+
+  # Set DataMember's EmitDefaultValue.
+  optionalEmitDefaultValues: null
+
+  # Specifies a AssemblyDescription for the .NET Framework global assembly attributes stored in the AssemblyInfo file.
+  generatePropertyChanged: null
+
+  # Generates code with reduced access modifiers; allows embedding elsewhere without exposing non-public API calls to consumers.
+  nonPublicApi: null
+
+  # boolean, toggles whether unicode identifiers are allowed in names or not, default is false
+  allowUnicodeIdentifiers: null
+
+  # Use the new format (.NET Core) for .NET project files (.csproj).
+  netCoreProjectFile: null
+
+  # Generates self-validatable models.
+  validatable: null
+
+  # Contents of OpenAPI Generator configuration file.
+  # This is the file that would be passed with --config option on OpenAPI Generator commandline.
+  # The JSON contents of that file should be the value of this parameter.
+  # This parameter need not be used. If it is absent, all string-valued parameters are collected into
+  # a map that is then passed to the OpenAPI Generator module. If a map is provided here, then string-valued
+  # parameters are still copied in, overriding like-named values appearing in the map.
+  openApiCodegenConfig: null
+
+  # System properties to set, as in the -D option of OpenAPI Generatorcommand line.
+  # Each property should be a json object with a name/value pair for each property.
+  # Example: for '-Dmodels -Dapis=User,Pets' use the following:
+  # value:
+  #   models: ''
+  #   apis: Users,Pets
+  openApiCodegenSystemProperties: null

Expanded Pet Store (v3)/gentargets/petstore-expanded/C# Client/build.gradle

@@ -0,0 +1,33 @@
+apply plugin: 'java'
+
+	repositories {
+		maven {
+			url "http://maven.reprezen.com/repository/releases"
+		}
+		maven {
+			url "http://maven.reprezen.com/repository/eclipse/"
+		}
+		mavenCentral()
+	}
+
+	dependencies {
+		compile ('com.modelsolv.reprezen:com.modelsolv.reprezen.generators.api:1.6.11.9445')
+		compile ('com.modelsolv.reprezen:com.modelsolv.reprezen.generators.xtend:1.6.11.9445') {
+		       exclude module: 'org.eclipse.equinox.bidi'
+		       exclude module: 'org.eclipse.emf.common.ui'
+		       exclude module: 'org.eclipse.e4.ui.workbench3'
+		       exclude module: 'org.apache.batik.css'
+		       exclude module: 'org.eclipse.e4.ui.css.swt'
+		}
+		compile ('com.modelsolv.reprezen:com.modelsolv.reprezen.generators.standard:1.6.11.9445')
+		compile fileTree(dir: '/Users/tanya/RepreZen/workspace/shared/GenTemplates', include: ['*.jar'])
+		compile fileTree(dir: '/Users/tanya/RepreZen/workspace/Expanded Pet Store (v3)/lib', include: ['*.jar'])
+	}
+
+	task(execGenTarget, dependsOn: 'classes', type: JavaExec) {
+		main = 'com.modelsolv.reprezen.generators.api.util.GeneratorLauncher'
+		classpath = sourceSets.main.runtimeClasspath
+		args '/Users/tanya/RepreZen/workspace/Expanded Pet Store (v3)/gentargets/petstore-expanded/C# Client/C# Client.gen'
+	}
+
+	defaultTasks 'execGenTarget'