Added library example

Author: kolovos

examples/org.eclipse.epsilon.examples.xsdxml/library/create-element.eol

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+// Get all the books contained in this library
+var library = LibraryType.all().first();
+var allBooks = library.book;
+
+// Print the current number of books
+allBooks.size().println();
+
+// Create a new book
+var newBook: new BookType;
+newBook.title = "MDE in Practice";
+
+// Add the book to the library
+library.book.add(newBook);
+
+// Get all books and print the new size
+BookType.all().size().println();

examples/org.eclipse.epsilon.examples.xsdxml/library/get-attributes.eol

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+// Get all the books contained in this library
+var allBooks = BookType.all();
+
+// Print the total number of pages of all books
+var total = 0;
+for (aBook in allBooks) {
+	total = total + aBook.pages;
+}
+("Total pages: " + total).println();
+
+// ... the same using collect() and sum() 
+// instead of a for loop
+BookType.all().collect(b|b.pages).sum().println();

examples/org.eclipse.epsilon.examples.xsdxml/library/library.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<library xsi:noNamespaceSchemaLocation="library.xsd">
+    <book title="EMF Eclipse Modeling Framework" pages="744">
+        <author>Dave Steinberg</author>
+        <author>Frank Budinsky</author>
+        <author>Marcelo Paternostro</author>
+        <author>Ed Merks</author>
+        <published>2009</published>
+    </book>
+    <book title="Eclipse Modeling Project: A Domain-Specific Language (DSL) Toolkit" pages="736">
+        <author>Richard Gronback</author>
+        <published>2009</published>
+    </book>
+    <book title="Official Eclipse 3.0 FAQs" pages="432">
+        <author>John Arthorne</author>
+        <author>Chris Laffra</author>
+        <published>2004</published>
+    </book>
+</library>

examples/org.eclipse.epsilon.examples.xsdxml/library/library.xsd

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+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
+	<xs:element name="library">
+		<xs:complexType>
+			<xs:sequence>
+				<xs:element name="book" maxOccurs="unbounded">
+					<xs:complexType>
+						<xs:sequence>
+							<xs:element name="author" maxOccurs="unbounded" type="xs:string"></xs:element>
+							<xs:element name="published" type="xs:int"></xs:element>
+						</xs:sequence>
+						<xs:attribute name="title" type="xs:string"></xs:attribute>
+						<xs:attribute name="pages" type="xs:int"></xs:attribute>
+					</xs:complexType>
+				</xs:element>
+			</xs:sequence>
+		</xs:complexType>
+	</xs:element>
+</xs:schema>

examples/org.eclipse.epsilon.examples.xsdxml/library/query-by-type.eol

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+// Get the first library element in the document
+var library = LibraryType.all().first();
+
+// Get all the books contained in this library
+var allBooks = library.book;
+
+// We can get all the books in the document by querying directly the book type
+var allBooksAlternative = BookType.all();
+
+// Iterate through the collection of books, navigate the pages attribute and 
+// return the title of the book if it has more than 700 pages
+for (aBook in allBooks) {
+	if (aBook.pages > 700) {
+		aBook.isTypeOf(BookType).println();
+		("The " + aBook.title + " is a large book!").println();
+	}
+}

examples/org.eclipse.epsilon.examples.xsdxml/library/set-element-text.eol

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+// Get the first book contained in the library
+var emfBook = BookType.all().first();
+
+// Set the title to a new one
+emfBook.title = "EMF Book";
+
+// Print the changed title (NB.: You need to have selected the "Store on disposal" 
+// option in the run configuration to save changes to the XML file.)
+var changedEmfBook =  BookType.all().first();
+changedEmfBook.title.println();

examples/org.eclipse.epsilon.examples.xsdxml/src/main/java/org/eclipse/epsilon/examples/xsdxml/LibraryExample.java

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+package org.eclipse.epsilon.examples.xsdxml;
+
+import java.io.File;
+
+import org.eclipse.epsilon.common.util.StringProperties;
+import org.eclipse.epsilon.emc.emf.xml.XmlModel;
+import org.eclipse.epsilon.eol.EolModule;
+
+public class LibraryExample {
+    
+    public static void main(String[] args) throws Exception {
+        
+        // Parse the EOL program
+        EolModule module = new EolModule();
+        module.parse(new File("library/query-by-type.eol"));
+        
+        // Load the model
+        XmlModel model = new XmlModel();
+        StringProperties properties = new StringProperties();
+        properties.put(XmlModel.PROPERTY_NAME, "M");
+        // No need to specify XSD URI due to xsi:noNamespaceSchemaLocation="library.xsd" in library.xml
+        properties.put(XmlModel.PROPERTY_MODEL_URI, new File("library/library.xml").toURI());
+        properties.put(XmlModel.PROPERTY_READONLOAD, "true");
+        properties.put(XmlModel.PROPERTY_STOREONDISPOSAL, "false");
+        model.load(properties);
+        
+        // Make the model available to the program
+        module.getContext().getModelRepository().addModel(model);
+        
+        // Execute the EOL program
+        module.execute();
+
+        // Dispose of the model
+        module.getContext().getModelRepository().dispose();
+    }
+}