Update introduction and links/descriptions of the standards

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 [[!toc levels=1]]
 
 The Open Real-Time Ethernet (ORTE) is an open source implementation of
-Real-Time Publish-Subscribe (RTPS) communication protocol. RTPS is new
-application layer protocol targeted to real-time communication area,
-which is build on the top of standard UDP stack. Since there are many
-TCP/IP stack implementations under many operating systems and RTPS
-protocol does not have any other special HW/SW requirements, it should
-be easily ported to many HW/SW target platforms. Because it uses only
-UDP protocol, it retains control of timing and reliability.
+Real-Time Publish-Subscribe (RTPS) communication protocol. RTPS is a
+new application layer protocol targeted at real-time communication
+area, which is built on the top of standard UDP stack. Since there are
+many TCP/IP stack implementations under many operating systems and
+RTPS protocol does not have any other special HW/SW requirements, it
+should be easily ported to many HW/SW target platforms. Because it
+uses only UDP protocol, it retains control of timing and reliability.
 
 ## News
 
@@ -29,10 +29,13 @@ UDP protocol, it retains control of timing and reliability.
   
   Specifications
 
-* [Data-Distribution Service for Real-Time Systems (DDS) standard](http://www.omg.org/technology/documents/formal/data_distribution.htm) DDS version 1.2. Latest version adopted in January 2007.
-* [DDS Interoperability Wire Protocol standard](http://www.omg.org/cgi-bin/doc?ptc/2006-08-02)
-* [[RTPS - Real Time Publish-Subscribe|rtps1.2.pdf]] RTPS Wire
-  Protocol Specification, version: 1.17
+* [Data-Distribution Service (DDS) related standards](http://www.omg.org/spec/#DDS)
+  – ORTE implements the RTPS protocol. It offers its own API, not the
+  DDS API.
+* [The Real-time Publish-Subscribe Wire Protocol (DDSI-RTPS)](http://www.omg.org/spec/DDSI-RTPS/)
+  – this is a newer version of the protocol implemented by ORTE.
+* [[Real Time Publish-Subscribe (RTPS) 1.0|rtps1.2.pdf]] – ORTE
+  implements this version of the protocol.
   
 ## Download