E. Code for Add Keyword Example
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## E. Code for Add Keyword Example

    #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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