According to the ​documentation of Relax NG, there is no way of telling a document the location of the Relax NG Schema as it is possible with a DTD.

In order to keep things clean and not confuse the user with relative paths to a local copy, a link to the Relax NG schema on this server can be entered. The stable version is situated at

https://it-dev.mpiwg-berlin.mpg.de/svn/mpdl-project-content/trunk/schema/schema/echo/echo.rnc

However, as this server can be reached only via https, the validators themselves have to be configured to accept a secure connection.

Oxygen

As our main editor at the moment is ​oxygen, either a processing instruction has to be entered into the xml-file, or a validation scenario has to be entered into oxygen (via Dokument > Validieren > Konfiguriere Validierungsszenario).

For this purpose, the SSL certificate of the it-dev server has to be downloaded (attached is a PEM-encoded version, see ​this blog entry on how to display and convert that file) and stored in the Java keystore. On Mac OS, this can be done via Keychain (Schlüsselbundverwaltung).

Then, edit oxygen's Info.plist with the Property List Editor and add two lines under Java > Properties:

• Key: javax.net.ssl.trustStoreProvider, Value: Apple (String)
• Key: javax.net.ssl.trustStoreType, Value: KeyChainStore (String)

You can also paste the following snippet directly into the Info.plist (in Java/Properties)

			<key>javax.net.ssl.trustStoreProvider</key>
			<string>Apple</string>
			<key>javax.net.ssl.trustStoreType</key>
			<string>KeychainStore</string>

Note that the Info.plist file is overwritten with every update of Oxygen.

Jing (Command line)

When using Jing, the common keystore of the Java Virtual Machine is used. It might be adviseable to build an own keystore which contains only the certificate of above server:

keytool -import -file it-dev.mpiwg-berlin.mpg.de.crt -keystore itdev.keystore

A password (at least 6 characters) has to be entered and confirmed.

The command

java -Djavax.net.ssl.trustStore=itdev.keystore -Djavax.net.ssl.trustStorePassword=<password> -jar $ECHO_SCRIPTS_DIR/share/thirdparty/jing-20091111/bin/jing.jar -c https://it-dev.mpiwg-berlin.mpg.de/svn/mpdl-project-content/trunk/schema/schema/echo/echo.rnc <textfile.xml>

Fingerprints of the key

SHA1: FA 59 20 79 0E 28 80 18 CA 2D 00 F1 B2 18 EA B7 00 F1 51 BE

MD5: 10 FB 77 75 C4 3A 30 62 BE 20 77 D5 51 F2 E0 C8