--- a/relpipe-data/principles.xml	Sat Nov 21 20:36:38 2020 +0100
+++ b/relpipe-data/principles.xml	Wed Dec 30 10:29:29 2020 +0100
@@ -11,13 +11,13 @@
 		<h2>Sane software</h2>
 		<p>
 			<m:name/> (both the specification and the reference implementation) should be developed according to the <a href="https://sane-software.globalcode.info/">Sane software manifesto</a> (draft).
-			Many of principles mentioned below are part of <em>being sane</em>. 
+			Many of the principles mentioned below are part of <em>being sane</em>. 
 		</p>
 		
 		<h2>Free software and open specification</h2>
 		
 		<p>
-			<m:name/> is and always will be a <a href="https://www.gnu.org/philosophy/free-sw.html">free software</a> and the specification of the format, tools and libraries will be open.
+			<m:name/> are and always will be a <a href="https://www.gnu.org/philosophy/free-sw.html">free software</a> and the specification of the format, tools and libraries will be open.
 			It must not be impaired by software patents or other similar restrictions.
 			In our country, we do not accept the existence of patents at all.
 		</p>
@@ -65,7 +65,7 @@
 		</p>
 		
 		<p>
-			However, in any case, we should provide also an option of producing <em>raw</em> data in the <m:name/> format and allow others to convert it to any other format according their needs.
+			However, in any case, we should provide also an option of producing <em>raw</em> data in the <m:name/> format and allow others to convert it to any other format according to their needs.
 		</p>
 		
 		<h2>Specification-first, contract-first</h2>