Need help with remote data handling and httpclient.

I am trying to populate a table with articles pulled from a PubMed search. The way I understand it I have to first search for 2 pieces of information from PubMed: WebEnv and QueryKey. http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgidb=pubmed&term=aorta&usehistory=y&rettype=xml&retmax=10

I get this:

<QueryKey>1</QueryKey>
<WebEnv>
NCID_1_55462841_130.14.22.215_9001_1387150273_1082905125
</WebEnv>

http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&query_key=" + QueryKey + "&WebEnv=" + WebEnv + "&rettype=xml&retmax=10

I am have been trying to figure this out for the past 2 days and I am sure if I am not even on the right track.

function xml_rss(_args) {
 
    var url = "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=aorta&usehistory=y&rettype=xml&retmax=10";
    var win = Ti.UI.createWindow();
    var table = Ti.UI.createTableView();
    var tableData = [];
    var json, fighters, fighter, i, row, nameLabel, nickLabel;
 
    var xhr = Ti.Network.createHTTPClient({
        onload : function() {
            // Ti.API.debug(this.responseText);
 
            var doc = this.responseXML.documentElement;
            var WebEnv = doc.getElementsByTagName("WebEnv");
            var QueryKey = doc.getElementsByTagName("QueryKey");
 
            var url1 = "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&query_key=" + QueryKey + "&WebEnv=" + WebEnv + "&rettype=xml&retmax=10";
 
            var xhr1 = Ti.Network.createHTTPClient({
                onload : function() {
 
                    var articles = xml.getElementsByTagName("PubmedArticle");
 
                    for ( var i = 0; i < articles.length; i++) {
 
                        var row = Ti.UI.createTableViewRow({
                            height : '60dp'
                        });
                        var nameLabel = Ti.UI.createLabel({
                            text : articles[i].getElementsByTagName("PMID")[0].firstChild.nodeValue,
                            font : {
                                fontSize : '24dp',
                                fontWeight : 'bold'
                            },
                            height : 'auto',
                            left : '10dp',
                            top : '5dp',
                            color : '#000',
                            touchEnabled : false
                        });
 
                        row.add(nameLabel);
                        tableData.push(row);
                    }
 
                    table.setData(tableData);
                },
                onerror : function(e) {
                    Ti.API.debug("STATUS: " + this.status);
                    Ti.API.debug("TEXT:   " + this.responseText);
                    Ti.API.debug("ERROR:  " + e.error);
                    alert('There was an error retrieving the remote data. Try again.');
                },
                timeout : 5000
            });
 
            xhr1.open("GET", url1);
            xhr1.send();
 
        },
        onerror : function(e) {
            Ti.API.debug("STATUS: " + this.status);
            Ti.API.debug("TEXT:   " + this.responseText);
            Ti.API.debug("ERROR:  " + e.error);
            alert('There was an error retrieving the remote data. Try again.');
        },
        timeout : 5000
    });
 
    xhr.open("GET", url);
    xhr.send();
 
    win.add(table);
    return win;
};
 
module.exports = xml_rss;