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. 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).

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. However, as this server can be reached only via https, oxygen itself has to be configured to accept a secure connection.

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.

The link to the latest version of the schema root is https://it-dev.mpiwg-berlin.mpg.de/svn/mpdl-project-content/trunk/schema/schema/echo/echo.rnc

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