Add figures and tables as related resources

[SvenLieber]

Some textual descriptions in the Knowledge Graph contain references to tables or figures.
For example the following excerpt from the task Building the reference glossary (RG)

A first version of a glossary is built by using the RL and by adding 
informal definitions (i.e., natural language sentences) to the terms. 
In essence, the RL evolves into a reference glossary (Fig. 9) 
by associating one or more definitions to each term. ...

Without the mentioned figure the instructions are not so clear. The understanding would definitely be improved if the related figure would be linked; an application could then render the figure.
These kind of resources can be added in their base64 encoding-representation, using e.g. the term http://www.w3.org/2011/content#ContentAsBase64