E. Code for Add Keyword Example

E. Code for Add Keyword Example
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+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <libxml/xmlmemory.h>
+#include <libxml/parser.h>
+
+void
+parseStory (xmlDocPtr doc, xmlNodePtr cur, char *keyword) {
+
+	xmlNewTextChild (cur, NULL, "keyword", keyword);
+    return;
+}
+
+xmlDocPtr
+parseDoc(char *docname, char *keyword) {
+
+	xmlDocPtr doc;
+	xmlNodePtr cur;
+
+	doc = xmlParseFile(docname);
+	
+	if (doc == NULL ) {
+		fprintf(stderr,"Document not parsed successfully. \n");
+		return (NULL);
+	}
+	
+	cur = xmlDocGetRootElement(doc);
+	
+	if (cur == NULL) {
+		fprintf(stderr,"empty document\n");
+		xmlFreeDoc(doc);
+		return (NULL);
+	}
+	
+	if (xmlStrcmp(cur->name, (const xmlChar *) "story")) {
+		fprintf(stderr,"document of the wrong type, root node != story");
+		xmlFreeDoc(doc);
+		return (NULL);
+	}
+	
+	cur = cur->xmlChildrenNode;
+	while (cur != NULL) {
+		if ((!xmlStrcmp(cur->name, (const xmlChar *)"storyinfo"))){
+			parseStory (doc, cur, keyword);
+		}
+		 
+	cur = cur->next;
+	}
+	return(doc);
+}
+
+int
+main(int argc, char **argv) {
+
+	char *docname;
+	char *keyword;
+	xmlDocPtr doc;
+
+	if (argc <= 2) {
+		printf("Usage: %s docname, keyword\n", argv[0]);
+		return(0);
+	}
+
+	docname = argv[1];
+	keyword = argv[2];
+	doc = parseDoc (docname, keyword);
+	if (doc != NULL) {
+		xmlSaveFormatFile (docname, doc, 0);
+		xmlFreeDoc(doc);
+	}
+	
+	return (1);
+}
+
+
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