diff -r 418e11eb6fea -r 192b0059a6c4 relpipe-data/examples-in-sql-selecting-existing-database.xml
--- a/relpipe-data/examples-in-sql-selecting-existing-database.xml	Thu May 21 01:23:23 2020 +0200
+++ b/relpipe-data/examples-in-sql-selecting-existing-database.xml	Sat Jun 06 01:57:24 2020 +0200
@@ -10,16 +10,16 @@
 		
 		<p>
 			Both the <code>relpipe-tr-sql</code> and <code>relpipe-in-sql</code>
-			support the option <code>--file</code> and can store data in a file instead of just in-memory.
-			Primary purpose of this option is to offload to HDD and be able to process more data whithout consuming too much RAM.
-			So such file is usually a temporary one and is deleted immediately after the transformation.
-			But we can also direct it to an existing file and append new relations to it.
-			Or we can create a new file and do not delete it – using the <code>--file-keep true</code> option.
+			support options <code>--data-source-name</code> and <code>--data-source-string</code>
+			that can be used for connecting to a different database than the in-memory SQLite one.
+			This is useful if we want to offload to HDD and be able to process more data whithout consuming too much RAM.
+			Or if we want to access an existing database instead of just transforming records from the STDIN to STDOUT.
+			These options allow connecting to any DBMS.
 		</p>
 		
 		<p>
 			Thus we can use the <code>relpipe-in-sql</code> as a database client to access existing SQLite files and SELECT from them (and then convert the results to any supported format).
-			An we can use the <code>relpipe-tr-sql</code> as an output filter which converts relational data to a SQLite file that can be queried later.
+			And we can use the <code>relpipe-tr-sql</code> as an output filter which converts relational data to a SQLite file that can be queried later.
 		</p>
 		
 		<p>
@@ -35,11 +35,11 @@
 		<m:pre jazyk="bash"><![CDATA[fossil clone http://www.sqlite.org/cgi/src sqlite.fossil]]></m:pre>
 		
 		<p>
-			We can then query it using <m:name/> tools:
+			We can then query the database file <code>sqlite.fossil</code> using <m:name/> tools:
 		</p>
 		
 		<m:pre jazyk="bash"><![CDATA[relpipe-in-sql \
-	--file sqlite.fossil \
+	--data-source-string 'Driver=SQLite3;Database=file:sqlite.fossil' \
 	--relation tickets "
 		SELECT 
 			type,