XEP 0055 (Jabber search) with iphone SDK

原来是搜索的服务没有安装，

    [iq addAttributeWithName:@"to"stringValue:@"search.localhost"];

I am creating a XMPP sample on ios. What I am trying to do is search user over xmpp. I checked the opernfire server and it has the search plugin enabled. I gone through XEP:0055 and found the stanza. I also gone through this so question but did

I am done with xmpp connection and login. Now here are the details regarding to my server:

Host Name = 10.x.x.x; Server name = abcd;

The request format I got from the XEP 0055 link is:

<iqtype='set'from='romeo@montague.net/home'to='characters.shakespeare.lit'id='search2'xml:lang='en'><queryxmlns='jabber:iq:search'><last>Capulet</last></query></iq>

I don't know what characters.shakespeare.lit is. I assume this is the server name. So I created following request:

<iqto="abcd"id="search2"xml:lang="en"><queryxmlns="jabber:iq:search"><Username>kapil</Username></query></iq>

but I am not getting any response. I tried to replace the to value with following search.abcd and10.x.x.x but I am not even receiving any response IQ for this rquest.