manipulate ubigraph from firefox

ubi.js

function Ubigraph(u) {
        this.endpoint = u || "http://127.0.0.1:20738/RPC2";

}
Ubigraph.prototype._invoke = function (xml) {
        var dec = '<?xml version="1.0" encoding="UTF-8"?>';
        var body = dec + xml.toSource();

        var r = new XMLHttpRequest();
        r.open("POST", this.endpoint, false);
        r.setRequestHeader( "Content-Type", "text/xml" )
        r.send( body);

        return new XML ( r.responseText.replace(dec, '') );
}

Ubigraph.prototype.clear = function () {
var xml = this._invoke( <><methodCall>
<methodName>ubigraph.clear</methodName>
<params>
<param><value><i4>0</i4></value></param>
</params>
</methodCall></>
);

}

Ubigraph.prototype.new_vertex = function () {
var xml = this._invoke( <><methodCall>
<methodName>ubigraph.new_vertex</methodName>
<params>
</params>
</methodCall></>
);
        return  parseInt(xml..i4);
}
Ubigraph.prototype.set_edge_attribute = function (v, attr, value) {
var xml = this._invoke( <><methodCall>
<methodName>ubigraph.set_edge_attribute</methodName>
<params>
<param><value><i4>{v}</i4></value></param>
<param><value><string>{attr}</string></value></param>
<param><value><string>{value}</string></value></param>
</params>
</methodCall></>
);
        return  parseInt(xml..i4);
}
Ubigraph.prototype.set_vertex_attribute = function (v, attr, value) {
var xml = this._invoke( <><methodCall>
<methodName>ubigraph.set_vertex_attribute</methodName>
<params>
<param><value><i4>{v}</i4></value></param>
<param><value><string>{attr}</string></value></param>
<param><value><string>{value}</string></value></param>
</params>
</methodCall></>
);
        return  parseInt(xml..i4);
}

Ubigraph.prototype.new_edge = function (v1, v2){
var xml = this._invoke( <><methodCall>
<methodName>ubigraph.new_edge</methodName>
<params>
<param><value><i4>{v1}</i4></value></param>
<param><value><i4>{v2}</i4></value></param>
</params>
</methodCall></>
);
        return  parseInt(xml..i4);
}

/*
try {
var u = new Ubigraph();
u.clear();
var vt = [];
var c = 100;
for(var i =0 ; i < c;i++) {
  vt[i] = u.new_vertex();;
}
for(var i =0 ; i < c;i++) {
 var n = Math.floor(Math.random()*c);
 var m = Math.floor(Math.random()*c);
var e1 = u.new_edge(vt[n], vt[m]);
}


}catch(e){e}



*/