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Open and save xml file from jmeter command line

I am trying to manipulate jmeter test plan in a web based tool. The problem is, it converts many characters to implicitly. For example " converts to ", 
 converts to newline.
I observed that, if i open that modified file from jmeter ui and save it without doing anything, all the characters are converted back to original. For example " converts to ".
So is it possible to do this automatically using jquery/javascript. I am using angularjs with node.js for my application. I would prefer to do this open-save-close operation in background. Please suggest , how can i achieve this. is there any jmeter-plugin available which i can run from javascript/jquery ?
Many thanks in advance

You need to escape the following characters in XML, otherwise it will result into invalid markup.
"
'
<
>
&
Given you use NodeJS you can use xml-escape function to do the trick for you.
JMeter provides __escapeXML() function out of the box just in case you're looking for Java-based implementation, see Apache JMeter Functions - An Introduction article to get familiarized with JMeter Functions concept.

What jmeter is doing with XML is correct and is done by the library XStream.
JMeter manipulate Java Objects and serializes them using XStream.
I am not sure what you are trying to do, but I don't think it is correct in terms of maintainability, indeed JMeter doesn't provide any contract on XML (XSD or DTD). Test plans should be manipulated through Java.
As far as I know, you cannot manipulate it through javascript, but you can potentially use this DSL to manipulate/generate test plans:
https://github.com/flood-io/ruby-jmeter

How to apply a localization to a javascript string

I assigned a string to a javascript string object, such like :
var word = "Please input correct verb"
I want this string be in control by resource file in asp.net project. Does it provide the function to replace the string using a ASP.NET syntax to switch languages?
<%$ Resources:Registration, correctverb%>
Thanks.

There are various l18n projects for JavaScript, e.g. http://i18next.com/
If you have ResX files in your ASP project and you want them as JavaScript or JSON files you can convert them here; or via the REST API you could convert a resource file as follows:
$ curl --data-binary #messages.resx \
http://localise.biz/api/convert/resx/messages.json
(example in cURL, which I guess you may not have if you're on Windows)

A common approach for this is creating an HTTP handler that evaluates requests for say files with the extension *.js.axd (or whatever extension you come up with) and then parse the javascript file by replacing defined tokens with the actual localized resource value.
It may be costly only the first time the file is requested but then everything should run smoothly if caching is applied. Here's an example of how to create a handler, parsing the file should be trivial. You could use the same syntax to define localized strings on your file: <% LocalizedResourceName %>

Does parsing an uploaded JSON with ActiveRecord::Serialization.from_json() in RoR open up any security loophole?

I am planning on implementing an export-import functionality in Ruby on Rails.
Now since JSON can include JavaScript, I wonder if anyone could inject malicious code that can be run when I ask ruby to convert the JSON to a hash.

No, JSON can not include javascript code*. It is more strict version of Javascript object literal synthax.
http://json.org/
*- actually, javascript code could be included in JSON in string, but it won't be parsed.

Can JQuery or JavaScript be used to manipulate XML/DOM without a browser?

I am starting to study some web technologies to integrate content, markup, layout, styling and behaviors of stuff for personal use (NOT web developing for now) and am amazed with the power of JQuery selectors and functions.
I have heard that there are some ways to use javascript "outside" a browser, to do some DOM selection, manipulation, etc. I wonder if JQuery could be used that way too.
So, what I would like to do is:
Using some programming/scripting language (I use Python), access a XML file and parse its DOM;
Programmatically manipulate and modify the DOM with javascript/jquery selectors and functions;
Save the results to (possibly another) XML file.

If you like jQuery syntax, check out pyQuery:
from pyquery import PyQuery
_ = PyQuery('<body><p></p></body>')
_("p").text("hello").css({'color': 'red'})
print _.html()
>>> <p style="color: red">hello</p>

yeah, you just need a Javascript run time.
Check out node.js

What you're looking for is called a "headless" browser.
This SO post may help:
Real headless browser

Basically you need a javascript interpreter (ex: V8) + wrapper for your language of choice (ex: pyv8). Then you can do this (from pyv8 page):
import PyV8
ctxt = PyV8.JSContext()
ctxt.enter()
ctxt.eval("1+2") # 1+2 is a javascript code

Javascript XML parsing or alternative

I'm building a Javascript preview function for a blog back-end (much like the one used on this website), and I'd like to be able to parse some custom tags that normally get parsed by PHP. I am wondering if it's possible to use the JS XML parser to parse content from a textarea that would look like:
<img=1>
Use for
<url=http://apwit.com>testing</url>
purposes only!
I read on another question here once that using regex to parse things like this is a bad idea because of the many many exceptions there could be. What do you think?

Use this: http://www.w3schools.com/Xml/tryit.asp?filename=tryxml_parsertest2
It parses xml from a string and uses the fast native XML parsing engine from the browser.
Explanation and discussion:
http://www.w3schools.com/Xml/xml_parser.asp