diff -r 000000000000 -r 522a326673b6 sysmodelmgr/com.symbian.smt.gui/src/com/symbian/smt/gui/SystemDefinition.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sysmodelmgr/com.symbian.smt.gui/src/com/symbian/smt/gui/SystemDefinition.java	Thu Mar 11 19:08:43 2010 +0200
@@ -0,0 +1,119 @@
+// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+package com.symbian.smt.gui;
+
+import java.io.IOException;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpression;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFactory;
+
+import org.w3c.dom.Document;
+import org.xml.sax.ErrorHandler;
+import org.xml.sax.SAXException;
+import org.xml.sax.SAXParseException;
+
+public class SystemDefinition {
+
+	/**
+	 * Determines whether the System Definition file is likely to be valid for the System Model Generator
+	 * Even if this function fails the SMG may still accept the file.
+	 * @param filename - the path to the System Definition file
+	 * @throws SystemDefinitionValidationException - Thrown if the parsing of the document fails. If the document parses
+	 * correctly but does not appear to be a System Definition file a {@link SystemDefinitionValidationFatalException} is thrown.
+	 */
+	public static void checkValidSystemDefinitionFile(String filename) throws SystemDefinitionValidationException {
+		Document doc;
+		try {
+			doc = createDocument(filename);
+		} catch (ParserConfigurationException e) {
+			throw new SystemDefinitionValidationException("Problem found when parsing "+filename+".", e);
+		} catch (SAXException e) {
+			throw new SystemDefinitionValidationException("Problem found when parsing "+filename+".", e);
+		} catch (IOException e) {
+			throw new SystemDefinitionValidationException("Problem found when reading "+filename+".", e);
+		}
+
+		// Check that the file is a system definition file
+		if (doc.getDoctype() != null && !doc.getDoctype().getName().equals("SystemDefinition")) {
+			throw new SystemDefinitionValidationFatalException(filename + " has the doctype "+doc.getDoctype()+". Where specified, the doctype should be \"SystemDefinition\".");
+		}
+	}
+
+	public static int coreOSType(String filename)
+			throws ParserConfigurationException, SAXException, IOException,
+			XPathExpressionException {
+		Document doc = createDocument(filename);
+
+		int type = 0;
+
+		XPathFactory factory = XPathFactory.newInstance();
+		XPath xpath = factory.newXPath();
+
+		XPathExpression expr = xpath
+				.compile("count(//layer[@name='Hardware']) > 0");
+		Object result = expr.evaluate(doc, XPathConstants.BOOLEAN);
+
+		if ((Boolean) result) {
+			type = 1;
+		}
+
+		expr = xpath.compile("count(//layer[@name='HAL']) > 0");
+		Object result2 = expr.evaluate(doc, XPathConstants.BOOLEAN);
+
+		if ((Boolean) result2) {
+			type = 2;
+		}
+
+		return type;
+	}
+
+	private static Document createDocument(final String filename)
+			throws ParserConfigurationException, SAXException, IOException {
+		DocumentBuilderFactory domFactory = DocumentBuilderFactory
+				.newInstance();
+		domFactory.setNamespaceAware(true);
+		domFactory.setValidating(false);
+
+		DocumentBuilder builder = domFactory.newDocumentBuilder();
+		ErrorHandler errorHandler = new ErrorHandler() {
+			public void error(SAXParseException exception)
+					throws SAXParseException {
+				throw exception;
+			}
+
+			public void fatalError(SAXParseException exception)
+					throws SAXParseException {
+				throw exception;
+			}
+
+			public void warning(SAXParseException exception)
+					throws SAXParseException {
+				throw exception;
+			}
+		};
+		builder.setErrorHandler(errorHandler);
+		Document doc = builder.parse(filename);
+
+		return doc;
+	}
+
+}