Add option `left to right direction`

[VladimirAlexiev]

@mariapoveda, @rgcmme I made a diagram from one of your examples:

Details in https://github.com/VladimirAlexiev/rdf2rml/tree/master/test/saref4city. Had to tweak prefixes and base to make it look better. If there's interest to visualize other SAREF examples like this, we can automate it.

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https://github.com/VladimirAlexiev/rdf2rml/tree/master/test/saref4city#why-the-rigmarole: need to add option left to right direction to my tool.

Maybe something like this in Turtle

[] puml:option "left to right direction"

where the text is directly dumped at the beginning of the puml.

Pros of this simple approach:

• This will also handle skinparam and !pragma
• "left to right direction" is neither skinparam, nor pragma (https://forum.plantuml.net/17002/how-to-set-left-to-right-direction-from-command-line) so needs to be emitted as text.
• cons: the textual order of statements puml:option is not guaranteed, but some puml options may need to come in order
• but hey! the user can use a multiline string like this:

  [] puml:option """
  left to right direction
  !pragma layout smetana
  """

[mariapoveda]

This looks really good. Which is the tool to generate the graphics?

[rgcmme]

Yes, it is very nice!

[VladimirAlexiev]

@mariapoveda @rgcmme The tool is rdfpuml in this repo