addressing #41

plugin-core/src/main/java/org/jvnet/jaxb2/maven2/AbstractXJC2Mojo.java

@@ -768,6 +768,22 @@ public boolean getEpisode() {
 	public void setEpisode(boolean episode) {
 		this.episode = episode;
 	}
+
+	/**
+	* If <b>true</b>, adds <b>if-exists="true"</b> in <b>bindings</b> elements.
+	* See https://github.com/highsource/maven-jaxb2-plugin/issues/41 for more
+	* information
+	*/
+	@Parameter(property = "maven.xjc2.applyEpisodeHackForUnusedSchemaBindings", defaultValue = "false")
+	private boolean applyEpisodeHackForUnusedSchemaBindings;
+
+	public boolean getApplyEpisodeHackForUnusedSchemaBindings() {
+		return this.applyEpisodeHackForUnusedSchemaBindings;
+	}
+
+	public void setApplyEpisodeHackForUnusedSchemaBindings(boolean applyEpisodeHackForUnusedSchemaBindings) {
+		this.applyEpisodeHackForUnusedSchemaBindings = applyEpisodeHackForUnusedSchemaBindings;
+	}	
 
 	/**
 	 * If true, marks generated classes using a @Generated annotation - i.e.

plugin-core/src/main/java/org/jvnet/jaxb2/maven2/RawXJC2Mojo.java

@@ -16,6 +16,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -34,6 +35,14 @@
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
 
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.TransformerFactoryConfigurationError;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.DefaultArtifact;
 import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
@@ -491,13 +500,39 @@ protected void doExecute() throws MojoExecutionException {
 					MessageFormat.format(
 							"Refreshing the generated directory [{0}].",
 							getGenerateDirectory().getAbsolutePath()));
+			setupEpisodeHackForUnusedSchemaBindings();
 			buildContext.refresh(getGenerateDirectory());
 		}
 
 		if (getVerbose()) {
 			getLog().info("Finished execution.");
 		}
 	}
+
+
+	private void setupEpisodeHackForUnusedSchemaBindings() throws MojoExecutionException {
+		if(!getApplyEpisodeHackForUnusedSchemaBindings()) {
+			getLog().debug("allowImporWithUnusedSchemaBindingsInEpisode disabled");
+			return;
+		}
+		File episodeFile = getEpisodeFile();
+		if(!episodeFile.canWrite()) {
+			getLog().debug(MessageFormat.format("Episode file [{0}] not writable, applyEpisodeHackForUnusedSchemaBindings configuration aborted", episodeFile));
+			return;
+		}
+		try {
+			File tempEpisode = File.createTempFile("maven.xjc2", "episode");
+			Transformer transformer = TransformerFactory.newInstance().newTransformer(new StreamSource(getClass().getResourceAsStream("/episodeHackForUnusedSchemaBindings.xslt")));
+			transformer.transform(new StreamSource(episodeFile), new StreamResult(tempEpisode));
+			FileUtils.copyFile(tempEpisode, episodeFile);
+			FileUtils.forceDelete(tempEpisode);
+			getLog().info(MessageFormat.format("Episode file [{0}] transformed to allow import with unused schema bindings", episodeFile));
+		} catch(IOException e) {
+			throw new MojoExecutionException(MessageFormat.format("IO error transforming [{0}] to allow import with unused schema bindings", episodeFile), e);
+		} catch (TransformerException e) {
+			throw new MojoExecutionException(MessageFormat.format("Unexpected transformation error in [{0}] to allow import with unused schema bindings", episodeFile), e);
+		}		
+	}	
 
 	private URILastModifiedResolver uriLastModifiedResolver;
 

plugin-core/src/main/resources/episodeHackForUnusedSchemaBindings.xslt

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:jaxp="http://java.sun.com/xml/ns/jaxb"
+   version="1.0">
+    <!-- this template is applied by default to all nodes and attributes -->
+   <xsl:template match="@*|node()">
+        <!-- just copy all my attributes and child nodes, except if there's a better template for some of them -->
+      <xsl:copy>
+         <xsl:apply-templates select="@*|node()" />
+      </xsl:copy>
+   </xsl:template>
+   <xsl:template match="jaxp:bindings[@scd='x-schema::tns']">
+      <xsl:copy>
+         <xsl:attribute name="if-exists">true</xsl:attribute>
+         <xsl:apply-templates select="@*|node()" />
+      </xsl:copy>
+   </xsl:template>
+</xsl:stylesheet>