libxml-2.0 XPath Vala example added.

vala/libxml-2.0/books.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<books>
+	<book id="1">
+		<title>The Royal Game</title>
+		<author>Stefan Zweig</author>
+	</book>
+	<book id="2">
+		<title>The Stoker</title>
+		<author>Franz Kafka</author>
+	</book>
+</books>

vala/libxml-2.0/run.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+valac --pkg libxml-2.0 xpath.vala && ./xpath

vala/libxml-2.0/xpath.vala

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+public static int main (string[] args) {
+	// Parse the document from path
+	Xml.Doc* doc = Xml.Parser.parse_file ("books.xml");
+	if (doc == null) {
+		stdout.printf ("File 'books.xml' not found or permissions missing\n");
+		return 0;
+	}
+
+	Xml.XPath.Context cntx = new Xml.XPath.Context (doc);
+	Xml.XPath.Object* res = cntx.eval_expression ("/books/book/title");
+
+	assert (res != null);
+	assert (res->type == Xml.XPath.ObjectType.NODESET);
+	assert (res->nodesetval != null);
+
+	for (int i = 0; i < res->nodesetval->length (); i++) {
+		Xml.Node* node = res->nodesetval->item (i);
+		stdout.printf ("%s\n", node->get_content ());
+	}
+
+	delete res;
+	delete doc;
+	return 0;
+}