javascript - Please help me understand a few things found in the SO page source -

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I was just looking at the stackoverflow page source and I have some simple questions;

1) What is its purpose? Is this search engine or something else? 

  & lt; Link rel = "search" type = "application / opensearchdescription + xml" title = "stack overflow" href = "/ opensearch.xml" & gt;

2) ? V = 3731 Why is this added to the end of some javascript and stylesheet files, is it a browser to prevent these items from caching? And if I am right, why would you not want it, I would think that they will not change often

3) This type of file is this rel = "canonical"

4) What it is, my guess is that if you put page URLs in some Google Reader, then perhaps this file will rarely be found? 

  & lt; Link rel = "alternate" type = "application / atom + xml" title = "feed for question" php array and `foreach?  
 
 
      Li> 
     This site is capable of using as a built-in search within a browser. The way Wikipedia can be used in Firefox from the top right can get more information 
      
  1.  
     This is the use of browser caching, which is likely to be set aggressively with content headings. By adding V =? The latest JS file is used when any modification is made. 
     
    2.  
  2.  
     Canonical is used to specify the preferred version of the URL, if That content is 
     
    3.  
  3.  
     Yes, it is used to indicate that the URL can serve RSS / nuclear feed which can be fed through the reader such as Google Reader. 
     
    4.

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