Start Eclipse. Choose the menu option: Help / Install New Software.
In the Install dialog box press Add button.
Enter the value into the Location field of the Add
Site dialog box. Press the OK button.
Select the checkbox corresponding to the Oxygen XML plugin
and press the Next button.
Select the Oxygen XML plugin and press the Finish button.
At the end of the installation a confirmation dialog box will inform you that
the install process was completed and will ask for a restart of Eclipse. You must accept
the Eclipse restart.
Update Site Distribution
Uninstalling the Eclipse plugin
In Eclipse go to the main menu: Help > About, press Installation
Details.
In the Installed Software tab select Oxygen from the list of plugins and
press Uninstall...
Press Finish to confirm uninstalling and restart Eclipse when prompted
to.