E. Code for Retrieving Attribute Value Example
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## E. Code for Retrieving Attribute Value Example

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

    void
    getReference (xmlDocPtr doc, xmlNodePtr cur) {

    	xmlChar *uri;
    	cur = cur->xmlChildrenNode;
    	while (cur != NULL) {
    	    if ((!xmlStrcmp(cur->name, (const xmlChar *)"reference"))) {
    		    uri = xmlGetProp(cur, "uri");
    		    printf("uri: %s\n", uri);
    		    xmlFree(uri);
    	    }
    	    cur = cur->next;
    	}
    	return;
    }

    void
    parseDoc(char *docname) {

    	xmlDocPtr doc;
    	xmlNodePtr cur;

    	doc = xmlParseFile(docname);

    	if (doc == NULL ) {
    		fprintf(stderr,"Document not parsed successfully. \n");
    		return;
    	}

    	cur = xmlDocGetRootElement(doc);

    	if (cur == NULL) {
    		fprintf(stderr,"empty document\n");
    		xmlFreeDoc(doc);
    		return;
    	}

    	if (xmlStrcmp(cur->name, (const xmlChar *) "story")) {
    		fprintf(stderr,"document of the wrong type, root node != story");
    		xmlFreeDoc(doc);
    		return;
    	}

    	getReference (doc, cur);
    	xmlFreeDoc(doc);
    	return;
    }

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

    	char *docname;

    	if (argc <= 1) {
    		printf("Usage: %s docname\n", argv[0]);
    		return(0);
    	}

    	docname = argv[1];
    	parseDoc (docname);

    	return (1);
    }

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