Better support for SDO vocabularies

[dgarijo]

SDO-style vocabularies are not properly supported right now (see #274 for a partial fix). Mainly, what is needed is:

• Support creating a different section with "properties" and recognize all rdf properties there if they have domainIncludes or rangeIncludes.
• Make sure domainIncludes rangeincludes properties show properly (they do now)

I have been following the discussion on other tools, and @VladimirAlexiev has gathered the attached files for
schema files.zip

[dgarijo]

Also see RDFLib/pyLODE#108

[VladimirAlexiev]

essepuntato/LODE#15, essepuntato/LODE#13 also handled richer metadata, eg:

• multiple values of skos:example
• markdown bullets in long descriptions
• etc

I don't remember all the details :-( But you can compare these examples:

• https://rawcdn.githack.com/euBusinessGraph/eubg-data/master/ontology/_old/index.html made with my patched LODE (which is available at https://github.com/euBusinessGraph/eubg-data/tree/master/ontology/_old, mostly extraction.xsl)
• https://rawcdn.githack.com/euBusinessGraph/eubg-data/master/ontology/doc.html made with PyLODE

[dgarijo]

@VladimirAlexiev thanks for the files and examples. I am trying to understand:

• Which one is the right doc? Is it the one of the left, which has the the extended skos, markdown, etc. or the one in the right (which seems to be missing notes, etc.?
• Is there anything missing in the doc of the left?
• I see you have added owl:ObjectProperty and owl:DatatypeProperty. Is this expected? I see sdo schemas do not often have it declared.
  Thanks in advance!