F. Code for Add Attribute Example
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## F. Code for Add Attribute Example

    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>
    #include <libxml/xmlmemory.h>
    #include <libxml/parser.h>

    xmlDocPtr
    parseDoc(char *docname, char *uri) {

    	xmlDocPtr doc;
    	xmlNodePtr cur;
    	xmlNodePtr newnode;
    	xmlAttrPtr newattr;

    	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);
    	}

    	newnode = xmlNewTextChild (cur, NULL, "reference", NULL);
    	newattr = xmlNewProp (newnode, "uri", uri);
    	return(doc);
    }

    int
    main(int argc, char **argv) {

    	char *docname;
    	char *uri;
    	xmlDocPtr doc;

    	if (argc <= 2) {
    		printf("Usage: %s docname, uri\n", argv[0]);
    		return(0);
    	}

    	docname = argv[1];
    	uri = argv[2];
    	doc = parseDoc (docname, uri);
    	if (doc != NULL) {
    		xmlSaveFormatFile (docname, doc, 1);
    		xmlFreeDoc(doc);
    	}
    	return (1);
    }

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