Merge pull request #5 from YujiSODE/Y20170923

Y20170923

Author: YujiSODE

README.md

@@ -5,6 +5,12 @@ https://github.com/YujiSODE/img2Dataurls
 >This software is released under the MIT License.  
 >See LICENSE or http://opensource.org/licenses/mit-license.php
 ______
+>## 0. data URL scheme
+>According to RFC 2397 \(Masinter, 1998\), data URL scheme is URL scheme that would work like \'immediate addressing\', and this scheme has following form of URL:  
+>`data:[<mediatype>][;base64],<data>`  
+>RFC 2397 \(Masinter, 1998\) shows an example of using data URL scheme as an inline image in a HTML document as follows:  
+>`<IMG SRC="data:image/gif;base64,R0lGODdhM` ... `AA7" ALT="Larry">`
+
 ## 1. Synopsis
 **Tcl**  
 `::img2Dataurls::getUrls exName1;`  
@@ -40,4 +46,5 @@ This script outputs a file that has an array of dataurls corresponding to image
 - dataurl64/dataurl64.tcl (Yuji SODE,2017): the MIT License; https://gist.github.com/YujiSODE/009cdfb080e273ec506a1ef24acd050c
 
 ## 4. Reference
-
+- Masinter, L. 1998. The "data" URL scheme. *Request for Comments 2397*, *The Internet Society*.
+derived on \[2017-09-23\] from: https://tools.ietf.org/html/rfc2397