kxml - parsing AWS API xml respond

[holo via Digitalmars-d-learn]

I'm trying to take out from AWS respond needed information. Here 
is cut off part of example respond:

...
                     <instanceId>i-xxxxx</instanceId>
                     <imageId>ami-xxxxx</imageId>
                     <instanceState>
                         <code>16</code>
                         <name>running</name>
                     </instanceState>
                     
<privateDnsName>ip-xxxxxxx.ec2.internal</privateDnsName>
                     
<dnsName>ec2-xxxxxx.compute-1.amazonaws.com</dnsName>
                     <reason/>
                     <keyName>ec2key</keyName>
                     <amiLaunchIndex>0</amiLaunchIndex>
                     <productCodes>
                         <item>
                             
<productCode>xxxxxxxxxxxxxxxxxxxx</productCode>
                             <type>marketplace</type>
                         </item>
                     </productCodes>
                     <instanceType>c3.large</instanceType>
                     
<launchTime>2015-08-18T16:51:11.000Z</launchTime>
...

With such code im getting only information about all instance ids:

     string xmlstring = cast(string)read("test.xml");
     XmlNode newdoc = xmlstring.readDocument();
     XmlNode[]  searchlist = newdoc.parseXPath("//instanceId");
     writeln(searchlist);

What i need is that to take out from there instance id and eg 
LaunchTime for that instance. How can i do it using kxml?

Why there is needed that "//" before tag? In other way im not 
getting any respond. What is interesting when i do that same with 
first tag appearing in respond it is not needed. From other hand 
with "///" i'm getting much more information but not separated by 
coma.

How to drop tags from respond? I have such result of parsing by 
id tag:

<instanceId>i-xxxxxx</instanceId>

I need only value. Is there some equivalent to ".text" from 
std.xml?