Oxygen XML Editor does not render by default EMF images.
This plugin adds support to render EMF images in Author mode but you need to install additional libraries in order to make it work.
To install this plugin you need to download this project as ZIP file and extract it inside the plugins folder within Oxygen install dir. Then you need to download a binary libraries distribution from:
http://java.freehep.org/vectorgraphics/index.html
for example download the ZIP file:
ftp://ftp.slac.stanford.edu/software/freehep/VectorGraphics/v2.1.1/vectorgraphics-2.1.1-bin.zip
After this you need to unpack the zip and all the "*.jar" libraries from its "lib" folder should be moved to the plugin's "lib" folder.
Copyright 2019 Syncro Soft SRL.
This project is licensed under Apache License 2.0. The required binary libraries (see the note above) are licensed under their own terms.