Merge xsd-xml module into xsd module to tentatively test out the emerging ML consensus on module make up

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@767828 13f79535-47bb-0310-9956-ffa450edef68

12 files changed, 863 insertions, 6 deletions

diff --git a/java/sca/modules/xsd/META-INF/MANIFEST.MF b/java/sca/modules/xsd/META-INF/MANIFEST.MF
index 349dd4b438..f88a2e4ad3 100644
--- a/java/sca/modules/xsd/META-INF/MANIFEST.MF
+++ b/java/sca/modules/xsd/META-INF/MANIFEST.MF
@@ -1,7 +1,21 @@
 Manifest-Version: 1.0

-Export-Package: org.apache.tuscany.sca.xsd;uses:="org.apache.ws.common

- s.schema,org.apache.tuscany.sca.assembly,org.w3c.dom,javax.xml.namesp

- ace";version="2.0.0"

+Export-Package: org.apache.tuscany.sca.xsd;version="2.0.0";

+  uses:="org.apache.ws.commons.schema,

+   org.apache.tuscany.sca.assembly,

+   org.w3c.dom,javax.xml.namespace",

+ org.apache.tuscany.sca.xsd.xml;version="2.0.0";

+  uses:="org.apache.ws.commons.schema,

+   org.apache.ws.commons.schema.resolver,

+   org.apache.tuscany.sca.contribution,

+   org.apache.tuscany.sca.core,

+   org.apache.tuscany.sca.monitor,

+   org.w3c.dom,

+   org.apache.tuscany.sca.contribution.namespace,

+   javax.xml.namespace,

+   org.xml.sax,

+   javax.xml.stream,

+   org.apache.tuscany.sca.contribution.resolver,

+   org.apache.tuscany.sca.contribution.processor"

 Private-Package: org.apache.tuscany.sca.xsd.impl;version="2.0.0"

 Tool: Bnd-0.0.255

 Bundle-Name: Apache Tuscany SCA XSD Model

@@ -12,9 +26,21 @@ Bnd-LastModified: 1225397174343
 Bundle-ManifestVersion: 2

 Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt

 Bundle-Description: Apache Tuscany SCA XSD Model

-Import-Package: javax.xml.namespace,org.apache.tuscany.sca.assembly;ve

- rsion="2.0.0",org.apache.tuscany.sca.xsd;version="2.0.0",org.apache.ws.co

- mmons.schema,org.w3c.dom

+Import-Package: javax.xml.namespace,

+ javax.xml.stream,

+ org.apache.tuscany.sca.assembly;version="2.0.0",

+ org.apache.tuscany.sca.contribution;version="2.0.0",

+ org.apache.tuscany.sca.contribution.namespace;version="2.0.0",

+ org.apache.tuscany.sca.contribution.processor;version="2.0.0",

+ org.apache.tuscany.sca.contribution.resolver;version="2.0.0",

+ org.apache.tuscany.sca.core;version="2.0.0",

+ org.apache.tuscany.sca.monitor;version="2.0.0",

+ org.apache.tuscany.sca.xsd;version="2.0.0",

+ org.apache.tuscany.sca.xsd.xml;version="2.0.0",

+ org.apache.ws.commons.schema,

+ org.apache.ws.commons.schema.resolver,

+ org.w3c.dom,

+ org.xml.sax

 Bundle-SymbolicName: org.apache.tuscany.sca.xsd

 Bundle-DocURL: http://www.apache.org/

 Bundle-RequiredExecutionEnvironment: J2SE-1.5,JavaSE-1.6
diff --git a/java/sca/modules/xsd/pom.xml b/java/sca/modules/xsd/pom.xml
index fb45d7921e..ed059d0c95 100644
--- a/java/sca/modules/xsd/pom.xml
+++ b/java/sca/modules/xsd/pom.xml
@@ -40,6 +40,16 @@
             <artifactId>XmlSchema</artifactId>

             <version>1.4.2</version>

         </dependency>

+        <dependency>

+            <groupId>org.apache.tuscany.sca</groupId>

+            <artifactId>tuscany-contribution</artifactId>

+            <version>2.0-SNAPSHOT</version>

+        </dependency>

+        <dependency>

+            <groupId>org.apache.tuscany.sca</groupId>

+            <artifactId>tuscany-contribution-namespace</artifactId>

+            <version>2.0-SNAPSHOT</version>

+        </dependency>

     </dependencies>

 

     <repositories>

diff --git a/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XMLDocumentHelper.java b/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XMLDocumentHelper.java
new file mode 100644
index 0000000000..a057bbe155
--- /dev/null
+++ b/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XMLDocumentHelper.java
@@ -0,0 +1,184 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.xsd.xml;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
+import java.net.URL;
+import java.net.URLConnection;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamConstants;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+
+import org.xml.sax.InputSource;
+
+/**
+ * @version $Rev$ $Date$
+ */
+public class XMLDocumentHelper {
+    public static final QName WSDL11 = new QName("http://schemas.xmlsoap.org/wsdl/", "definitions");
+    public static final QName XSD = new QName("http://www.w3.org/2001/XMLSchema", "schema");
+    public static final QName WSDL20 = new QName("http://www.w3.org/ns/wsdl", "description");
+
+    protected static final int BUFFER_SIZE = 256;
+
+    /**
+     * Detect the XML encoding of the document
+     * 
+     * @param is The input stream
+     * @return The encoding
+     * @throws IOException
+     */
+    public static String getEncoding(InputStream is) throws IOException {
+        if (!is.markSupported())
+            is = new BufferedInputStream(is);
+
+        byte[] buffer = readBuffer(is);
+        return getXMLEncoding(buffer);
+    }
+
+    /**
+     * Searches the array of bytes to determine the XML encoding.
+     */
+    protected static String getXMLEncoding(byte[] bytes) {
+        String javaEncoding = null;
+
+        if (bytes.length >= 4) {
+            if (((bytes[0] == -2) && (bytes[1] == -1)) || ((bytes[0] == 0) && (bytes[1] == 60)))
+                javaEncoding = "UnicodeBig";
+            else if (((bytes[0] == -1) && (bytes[1] == -2)) || ((bytes[0] == 60) && (bytes[1] == 0)))
+                javaEncoding = "UnicodeLittle";
+            else if ((bytes[0] == -17) && (bytes[1] == -69) && (bytes[2] == -65))
+                javaEncoding = "UTF8";
+        }
+
+        String header = null;
+
+        try {
+            if (javaEncoding != null)
+                header = new String(bytes, 0, bytes.length, javaEncoding);
+            else
+                header = new String(bytes, 0, bytes.length);
+        } catch (UnsupportedEncodingException e) {
+            return null;
+        }
+
+        if (!header.startsWith("<?xml"))
+            return "UTF-8";
+
+        int endOfXMLPI = header.indexOf("?>");
+        int encodingIndex = header.indexOf("encoding", 6);
+
+        if ((encodingIndex == -1) || (encodingIndex > endOfXMLPI))
+            return "UTF-8";
+
+        int firstQuoteIndex = header.indexOf("\"", encodingIndex);
+        int lastQuoteIndex;
+
+        if ((firstQuoteIndex == -1) || (firstQuoteIndex > endOfXMLPI)) {
+            firstQuoteIndex = header.indexOf("'", encodingIndex);
+            lastQuoteIndex = header.indexOf("'", firstQuoteIndex + 1);
+        } else
+            lastQuoteIndex = header.indexOf("\"", firstQuoteIndex + 1);
+
+        return header.substring(firstQuoteIndex + 1, lastQuoteIndex);
+    }
+
+    protected static byte[] readBuffer(InputStream is) throws IOException {
+        if (is.available() == 0) {
+            return new byte[0];
+        }
+
+        byte[] buffer = new byte[BUFFER_SIZE];
+        is.mark(BUFFER_SIZE);
+        int bytesRead = is.read(buffer, 0, BUFFER_SIZE);
+        int totalBytesRead = bytesRead;
+
+        while (bytesRead != -1 && (totalBytesRead < BUFFER_SIZE)) {
+            bytesRead = is.read(buffer, totalBytesRead, BUFFER_SIZE - totalBytesRead);
+
+            if (bytesRead != -1)
+                totalBytesRead += bytesRead;
+        }
+
+        if (totalBytesRead < BUFFER_SIZE) {
+            byte[] smallerBuffer = new byte[totalBytesRead];
+            System.arraycopy(buffer, 0, smallerBuffer, 0, totalBytesRead);
+            smallerBuffer = buffer;
+        }
+
+        is.reset();
+        return buffer;
+    }
+
+    public static InputSource getInputSource(URL url) throws IOException {
+        URLConnection connection = url.openConnection();
+        connection.setUseCaches(false);
+        InputStream is = connection.getInputStream();
+        return getInputSource(url, is);
+    }
+
+    public static InputSource getInputSource(URL url, InputStream is) throws IOException {
+        is = new BufferedInputStream(is);
+        String encoding = getEncoding(is);
+        InputSource inputSource = new InputSource(is);
+        inputSource.setEncoding(encoding);
+        // [rfeng] Make sure we set the system id as it will be used as the base URI for nested import/include 
+        inputSource.setSystemId(url.toString());
+        return inputSource;
+    }
+
+    public static String readTargetNamespace(URL doc, QName element, boolean rootOnly, String attribute, XMLInputFactory inputFactory)
+        throws IOException, XMLStreamException {
+        if (attribute == null) {
+            attribute = "targetNamespace";
+        }
+        URLConnection connection = doc.openConnection();
+        connection.setUseCaches(false);
+        InputStream is = connection.getInputStream();
+        try {
+            XMLStreamReader reader = inputFactory.createXMLStreamReader(is);
+            int eventType = reader.getEventType();
+            while (true) {
+                if (eventType == XMLStreamConstants.START_ELEMENT) {
+                    if (element.equals(reader.getName())) {
+                        return reader.getAttributeValue(null, attribute);
+                    } else if (rootOnly) {
+                        return null;
+                    }
+                }
+                if (reader.hasNext()) {
+                    eventType = reader.next();
+                } else {
+                    break;
+                }
+            }
+            return null;
+        } finally {
+            is.close();
+        }
+    }
+
+}
diff --git a/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XSDDocumentProcessor.java b/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XSDDocumentProcessor.java
new file mode 100644
index 0000000000..1d84b6c0a0
--- /dev/null
+++ b/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XSDDocumentProcessor.java
@@ -0,0 +1,101 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.xsd.xml;
+
+import java.net.URI;
+import java.net.URL;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLInputFactory;
+
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+import org.apache.tuscany.sca.xsd.XSDFactory;
+import org.apache.tuscany.sca.xsd.XSDefinition;
+
+/**
+ * An ArtifactProcessor for XSD documents.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class XSDDocumentProcessor implements URLArtifactProcessor<XSDefinition> {
+
+    private XSDFactory factory;
+    private XMLInputFactory inputFactory;
+    private Monitor monitor;
+
+    public XSDDocumentProcessor(FactoryExtensionPoint modelFactories, Monitor monitor) {
+        this.factory = modelFactories.getFactory(XSDFactory.class);
+        this.inputFactory = modelFactories.getFactory(XMLInputFactory.class);
+        this.monitor = monitor;
+    }
+    
+    /**
+     * Report a exception.
+     * 
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(String message, Object model, Exception ex) {
+        if (monitor != null) {
+            Problem problem = monitor.createProblem(this.getClass().getName(), "xsd-xml-validation-messages", Severity.ERROR, model, message, ex);
+            monitor.problem(problem);
+        }        
+    }
+
+    public XSDefinition read(URL contributionURL, URI artifactURI, URL artifactURL) throws ContributionReadException {
+        try {
+            return indexRead(artifactURL);
+        } catch (Exception e) {
+            ContributionReadException ce = new ContributionReadException(e);
+            error("ContributionReadException", artifactURL, ce);
+            throw ce;
+        }
+    }
+
+    public void resolve(XSDefinition model, ModelResolver resolver) throws ContributionResolveException {
+    }
+
+    public String getArtifactType() {
+        return ".xsd";
+    }
+
+    public Class<XSDefinition> getModelType() {
+        return XSDefinition.class;
+    }
+
+    public static final QName XSD = new QName("http://www.w3.org/2001/XMLSchema", "schema");
+
+    protected XSDefinition indexRead(URL doc) throws Exception {
+        XSDefinition xsd = factory.createXSDefinition();
+        xsd.setUnresolved(true);
+        xsd.setNamespace(XMLDocumentHelper.readTargetNamespace(doc, XSD, true, "targetNamespace", inputFactory));
+        xsd.setLocation(doc.toURI());
+        xsd.setUnresolved(false);
+        return xsd;
+    }
+}
diff --git a/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XSDModelResolver.java b/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XSDModelResolver.java
new file mode 100644
index 0000000000..c30d3ebbd6
--- /dev/null
+++ b/java/sca/modules/xsd/src/main/java/org/apache/tuscany/sca/xsd/xml/XSDModelResolver.java
@@ -0,0 +1,279 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.xsd.xml;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.namespace.NamespaceImport;
+import org.apache.tuscany.sca.contribution.processor.ContributionRuntimeException;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.xsd.DefaultXSDFactory;
+import org.apache.tuscany.sca.xsd.XSDFactory;
+import org.apache.tuscany.sca.xsd.XSDefinition;
+import org.apache.ws.commons.schema.XmlSchema;
+import org.apache.ws.commons.schema.XmlSchemaCollection;
+import org.apache.ws.commons.schema.XmlSchemaInclude;
+import org.apache.ws.commons.schema.resolver.URIResolver;
+import org.xml.sax.InputSource;
+
+/**
+ * A Model Resolver for XSD models.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class XSDModelResolver implements ModelResolver {
+    private static final String AGGREGATED_XSD = "http://tuscany.apache.org/aggregated.xsd";
+    private XSDFactory factory;
+    private Contribution contribution;
+    private Map<String, List<XSDefinition>> map = new HashMap<String, List<XSDefinition>>();
+    private XmlSchemaCollection schemaCollection;
+
+    public XSDModelResolver(Contribution contribution, FactoryExtensionPoint modelFactories) {
+        this.contribution = contribution;
+        this.schemaCollection = new XmlSchemaCollection();
+        schemaCollection.setSchemaResolver(new URIResolverImpl(contribution));
+        this.factory = new DefaultXSDFactory();
+    }
+
+    public void addModel(Object resolved) {
+        XSDefinition definition = (XSDefinition)resolved;
+        List<XSDefinition> list = map.get(definition.getNamespace());
+        if (list == null) {
+            list = new ArrayList<XSDefinition>();
+            map.put(definition.getNamespace(), list);
+        }
+        list.add(definition);
+    }
+
+    public Object removeModel(Object resolved) {
+        XSDefinition definition = (XSDefinition)resolved;
+        List<XSDefinition> list = map.get(definition.getNamespace());
+        if (list == null) {
+            return null;
+        } else {
+            return list.remove(definition);
+        }
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved) {
+
+        XSDefinition definition = (XSDefinition)unresolved;
+        // Lookup a definition for the given namespace
+        String namespace = definition.getNamespace();
+        List<XSDefinition> list = map.get(namespace);
+        XSDefinition modelXSD = null;
+        if (list != null && definition.getDocument() != null) {
+            // Set the document for the inline schema
+            int index = list.indexOf(definition);
+            if (index != -1) {  // a matching (not identical) document was found
+                modelXSD = list.get(index);
+                modelXSD.setDocument(definition.getDocument());
+            }
+        }
+        if (list == null && definition.getDocument() != null) {
+            // Hit for the 1st time
+            list = new ArrayList<XSDefinition>();
+            list.add(definition);
+            map.put(namespace, list);
+        }
+        XSDefinition resolved = null;
+        try {
+            resolved = aggregate(list);
+        } catch (IOException e) {
+            throw new ContributionRuntimeException(e);
+        }
+        if (resolved != null && !resolved.isUnresolved()) {
+            if (definition.isUnresolved() && definition.getSchema() == null && modelXSD != null) {
+                // Update the unresolved model with schema information and mark it
+                // resolved.  This information in the unresolved model is needed when
+                // this method is called by WSDLModelResolver.readInlineSchemas().
+                definition.setSchema(modelXSD.getSchema());
+                definition.setSchemaCollection(modelXSD.getSchemaCollection());
+                definition.setUnresolved(false);
+            }
+            return modelClass.cast(resolved);
+        }
+
+        // No definition found, delegate the resolution to the imports
+        for (Import import_ : this.contribution.getImports()) {
+            if (import_ instanceof NamespaceImport) {
+                NamespaceImport namespaceImport = (NamespaceImport)import_;
+                if (namespaceImport.getNamespace().equals(namespace)) {
+
+                    // Delegate the resolution to the namespace import resolver
+                    resolved =
+                        namespaceImport.getModelResolver().resolveModel(XSDefinition.class, (XSDefinition)unresolved);
+                    if (!resolved.isUnresolved()) {
+                        return modelClass.cast(resolved);
+                    }
+                }
+            } else if (import_ instanceof DefaultImport) {
+
+                // Delegate the resolution to the default import resolver
+                resolved =
+                    import_.getModelResolver().resolveModel(XSDefinition.class, (XSDefinition)unresolved);
+                if (!resolved.isUnresolved()) {
+                    return modelClass.cast(resolved);
+                }
+            }
+        }
+        return modelClass.cast(unresolved);
+    }
+
+    private void loadOnDemand(XSDefinition definition) throws IOException {
+        if (definition.getSchema() != null) {
+            return;
+        }
+        if (definition.getDocument() != null) {
+            String uri = null;
+            if (definition.getLocation() != null) {
+                uri = definition.getLocation().toString();
+            }
+            XmlSchema schema = schemaCollection.read(definition.getDocument(), uri, null);
+            definition.setSchemaCollection(schemaCollection);
+            definition.setSchema(schema);
+            definition.setUnresolved(false);
+        } else if (definition.getLocation() != null) {
+            if (definition.getLocation().getFragment() != null) {
+                // It's an inline schema
+                return;
+            }
+            // Read an XSD document
+            InputSource xsd = XMLDocumentHelper.getInputSource(definition.getLocation().toURL());
+            for (XmlSchema d : schemaCollection.getXmlSchemas()) {
+                if (d.getTargetNamespace().equals(definition.getNamespace())) {
+                    if (d.getSourceURI().equals(definition.getLocation().toString()))
+                        return;
+                }
+            }
+            XmlSchema schema = schemaCollection.read(xsd, null);
+            definition.setSchemaCollection(schemaCollection);
+            definition.setSchema(schema);
+        }
+    }
+
+    /**
+     * Create a facade XmlSchema which includes all the definitions
+     * 
+     * @param definitions A list of the XmlSchema under the same target
+     *                namespace
+     * @return The aggregated XmlSchema
+     */
+    private XSDefinition aggregate(List<XSDefinition> definitions) throws IOException {
+        if (definitions == null || definitions.size() == 0) {
+            return null;
+        }
+        if (definitions.size() == 1) {
+            XSDefinition d = definitions.get(0);
+            loadOnDemand(d);
+            return d;
+        }
+        XSDefinition aggregated = factory.createXSDefinition();
+        for (XSDefinition d : definitions) {
+            loadOnDemand(d);
+        }
+        String ns = definitions.get(0).getNamespace();
+        
+        XmlSchema facade = null;
+        // Check if the facade XSD is already in the collection
+        for (XmlSchema s : schemaCollection.getXmlSchema(AGGREGATED_XSD)) {
+            if (ns.equals(s.getTargetNamespace())) {
+                facade = s;
+                break;
+            }
+        }
+        if (facade == null) {
+            // This will add the facade into the collection
+            facade = new XmlSchema(ns, AGGREGATED_XSD, schemaCollection);
+        }
+
+        for (XmlSchema d : schemaCollection.getXmlSchemas()) {
+            if (ns.equals(d.getTargetNamespace())) {
+                if (d == facade) {
+                    continue;
+                }
+                XmlSchemaInclude include = new XmlSchemaInclude();
+                include.setSchema(d);
+                include.setSourceURI(d.getSourceURI());
+                include.setSchemaLocation(d.getSourceURI());
+                facade.getIncludes().add(include);
+                facade.getItems().add(include);
+            }
+        }
+        aggregated.setUnresolved(true);
+        aggregated.setSchema(facade);
+        aggregated.setNamespace(ns);
+        aggregated.setAggregatedDefinitions(definitions);
+        aggregated.setUnresolved(false);
+
+        // FIXME: [rfeng] This is hacky
+        //definitions.clear();
+        //definitions.add(aggregated);
+        return aggregated;
+    }
+
+    /**
+     * URI resolver implementation for XML schema
+     */
+    public static class URIResolverImpl implements URIResolver {
+        private Contribution contribution;
+
+        public URIResolverImpl(Contribution contribution) {
+            this.contribution = contribution;
+        }
+
+        public org.xml.sax.InputSource resolveEntity(java.lang.String targetNamespace,
+                                                     java.lang.String schemaLocation,
+                                                     java.lang.String baseUri) {
+            try {
+                if (schemaLocation == null) {
+                    return null;
+                }
+                URL url = null;
+                if (schemaLocation.startsWith("/")) {
+                    // The URI is relative to the contribution
+                    String uri = schemaLocation.substring(1);
+                    for (Artifact a : contribution.getArtifacts()) {
+                        if (a.getURI().equals(uri)) {
+                            url = new URL(a.getLocation());
+                            break;
+                        }
+                    }
+                } else {
+                    url = new URL(new URL(baseUri), schemaLocation);
+                }
+                return XMLDocumentHelper.getInputSource(url);
+            } catch (IOException e) {
+                return null;
+            }
+        }
+    }
+
+}
diff --git a/java/sca/modules/xsd/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor b/java/sca/modules/xsd/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor
new file mode 100644
index 0000000000..1ec3d27200
--- /dev/null
+++ b/java/sca/modules/xsd/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+# Implementation class for the artifact processor extension
+org.apache.tuscany.sca.xsd.xml.XSDDocumentProcessor;type=.xsd,model=org.apache.tuscany.sca.xsd.XSDefinition
diff --git a/java/sca/modules/xsd/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.resolver.ModelResolver b/java/sca/modules/xsd/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.resolver.ModelResolver
new file mode 100644
index 0000000000..a67ecf063a
--- /dev/null
+++ b/java/sca/modules/xsd/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.resolver.ModelResolver
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+org.apache.tuscany.sca.xsd.xml.XSDModelResolver;model=org.apache.tuscany.sca.xsd.XSDefinition
diff --git a/java/sca/modules/xsd/src/main/resources/xsd-xml-validation-messages.properties b/java/sca/modules/xsd/src/main/resources/xsd-xml-validation-messages.properties
new file mode 100644
index 0000000000..ab50456510
--- /dev/null
+++ b/java/sca/modules/xsd/src/main/resources/xsd-xml-validation-messages.properties
@@ -0,0 +1,23 @@
+#
+#
+#    Licensed to the Apache Software Foundation (ASF) under one
+#    or more contributor license agreements. See the NOTICE file
+#    distributed with this work for additional information
+#    regarding copyright ownership. The ASF licenses this file
+#    to you under the Apache License, Version 2.0 (the
+#    "License"); you may not use this file except in compliance
+#    with the License. You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing,
+#    software distributed under the License is distributed on an
+#    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#    KIND, either express or implied. See the License for the
+#    specific language governing permissions and limitations
+#    under the License.
+#
+#
+ContributionReadException = ContributionReadException occured due to : {0}
+
+
diff --git a/java/sca/modules/xsd/src/test/java/org/apache/tuscany/sca/xsd/xml/XMLDocumentHelperTestCase.java b/java/sca/modules/xsd/src/test/java/org/apache/tuscany/sca/xsd/xml/XMLDocumentHelperTestCase.java
new file mode 100644
index 0000000000..56831e23d3
--- /dev/null
+++ b/java/sca/modules/xsd/src/test/java/org/apache/tuscany/sca/xsd/xml/XMLDocumentHelperTestCase.java
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.xsd.xml;
+
+import java.net.URL;
+
+import javax.xml.stream.XMLInputFactory;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * @version $Rev$ $Date$
+ */
+public class XMLDocumentHelperTestCase {
+    private URL xsd;
+
+    /**
+     * @throws java.lang.Exception
+     */
+    @Before
+    public void setUp() throws Exception {
+        xsd = getClass().getResource("/xsd/greeting.xsd");
+    }
+
+    @Test
+    public void testReadTNS() throws Exception {
+        String tns = XMLDocumentHelper.readTargetNamespace(xsd, XMLDocumentHelper.XSD, true, null, XMLInputFactory.newInstance());
+        Assert.assertEquals("http://greeting", tns);
+    }
+
+}
diff --git a/java/sca/modules/xsd/src/test/java/org/apache/tuscany/sca/xsd/xml/XSDDocumentProcessorTestCase.java b/java/sca/modules/xsd/src/test/java/org/apache/tuscany/sca/xsd/xml/XSDDocumentProcessorTestCase.java
new file mode 100644
index 0000000000..a20d5f6f58
--- /dev/null
+++ b/java/sca/modules/xsd/src/test/java/org/apache/tuscany/sca/xsd/xml/XSDDocumentProcessorTestCase.java
@@ -0,0 +1,89 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.xsd.xml;
+
+import java.net.URI;
+import java.net.URL;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.contribution.processor.ExtensibleURLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.DefaultExtensionPointRegistry;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.xsd.XSDefinition;
+import org.apache.ws.commons.schema.XmlSchemaInclude;
+import org.apache.ws.commons.schema.XmlSchemaObjectCollection;
+import org.apache.ws.commons.schema.XmlSchemaType;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * @version $Rev$ $Date$
+ */
+public class XSDDocumentProcessorTestCase {
+    private URLArtifactProcessor<Object> documentProcessor;
+    private ModelResolver resolver;
+
+    /**
+     * @throws java.lang.Exception
+     */
+    @Before
+    public void setUp() throws Exception {
+        ExtensionPointRegistry extensionPoints = new DefaultExtensionPointRegistry();
+        URLArtifactProcessorExtensionPoint documentProcessors = extensionPoints.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+        documentProcessor = new ExtensibleURLArtifactProcessor(documentProcessors, null);
+        FactoryExtensionPoint modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+        resolver = new XSDModelResolver(null, modelFactories);
+    }
+
+    @Test
+    public void testXSD() throws Exception {
+        URL url = getClass().getResource("/xsd/greeting.xsd");
+        XSDefinition definition = (XSDefinition)documentProcessor.read(null, URI.create("xsd/greeting.xsd"), url);
+        Assert.assertNull(definition.getSchema());
+        Assert.assertEquals("http://greeting", definition.getNamespace());
+        URL url1 = getClass().getResource("/xsd/name.xsd");
+        XSDefinition definition1 = (XSDefinition)documentProcessor.read(null, URI.create("xsd/name.xsd"), url1);
+        Assert.assertNull(definition1.getSchema());
+        Assert.assertEquals("http://greeting", definition1.getNamespace());
+        resolver.addModel(definition);
+        XSDefinition resolved = resolver.resolveModel(XSDefinition.class, definition);
+        XmlSchemaObjectCollection collection = resolved.getSchema().getIncludes();
+        Assert.assertTrue(collection.getCount() == 1);
+        XmlSchemaType type =
+            ((XmlSchemaInclude)collection.getItem(0)).getSchema().getTypeByName(new QName("http://greeting", "Name"));
+        Assert.assertNotNull(type);
+        resolver.addModel(definition1);
+        resolved = resolver.resolveModel(XSDefinition.class, definition);
+        collection = resolved.getSchema().getIncludes();
+        Assert.assertTrue(collection.getCount() == 2);
+        XmlSchemaType type1 =
+            ((XmlSchemaInclude)collection.getItem(0)).getSchema().getTypeByName(new QName("http://greeting", "Name"));
+        XmlSchemaType type2 =
+            ((XmlSchemaInclude)collection.getItem(1)).getSchema().getTypeByName(new QName("http://greeting", "Name"));
+        Assert.assertTrue(type1 != null || type2 != null);
+    }
+
+}
diff --git a/java/sca/modules/xsd/src/test/resources/xsd/greeting.xsd b/java/sca/modules/xsd/src/test/resources/xsd/greeting.xsd
new file mode 100644
index 0000000000..635ca25bfc
--- /dev/null
+++ b/java/sca/modules/xsd/src/test/resources/xsd/greeting.xsd
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+    Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+    
+    http://www.apache.org/licenses/LICENSE-2.0
+    
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+-->
+<schema targetNamespace="http://greeting" xmlns="http://www.w3.org/2001/XMLSchema">
+    <include schemaLocation="name.xsd" />
+    <complexType name="Greeting">
+        <sequence>
+            <element name="message" type="string" />
+            <element name="name" type="Name" />
+        </sequence>
+    </complexType>
+
+</schema>
\ No newline at end of file
diff --git a/java/sca/modules/xsd/src/test/resources/xsd/name.xsd b/java/sca/modules/xsd/src/test/resources/xsd/name.xsd
new file mode 100644
index 0000000000..300de931ec
--- /dev/null
+++ b/java/sca/modules/xsd/src/test/resources/xsd/name.xsd
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+    Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+    
+    http://www.apache.org/licenses/LICENSE-2.0
+    
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+-->
+<schema targetNamespace="http://greeting" xmlns="http://www.w3.org/2001/XMLSchema">
+
+    <complexType name="Name">
+        <sequence>
+            <element name="firstName" type="string" />
+            <element name="lastName" type="string" />
+        </sequence>
+    </complexType>
+
+</schema>
\ No newline at end of file