Qoutation ( " ) in both ends of word value just appear during exporting
During exporting file for Android strings, value inside an xml tag are wrapped with ( " ).
Example:
<string name="sample-name"> sample data </string>
During exporting to any desired language, the date would be:
<string name="sample-name"> "sample data" </string>
( " ) should not be there as the original data to be exported does not have those. Also, removing this from the exported file is a big work especially if I have lots of data in it.

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Android guidelines say that the proper way to keep strings is between quotes:
http://developer.android.com/guide/topics/resources/string-resource.html#FormattingAndStyling