Move RelationshipType naming convention to Markdown guide instead

[bact]

• Put info about directionality and temporality to Relationship description.
• Move the sentences: "Relationship names should be descriptive enough to easily deduce the correct direction from their name. The best way to do this is to make sure that the relationship name completes the sentence.." out of the RelationshipType description and put them to the "Naming convention" section in the Markdown guide (docs/format.md) instead.
  • They are not meant for the users of the spec but for the authors of the spec.
  • As the RELATIONSHIP is in capital letters, looks like it is from SPDX 2 - should remove it.
• Update an example for property naming convention
  • Replace "import" (singular noun) / "imports" (singular verb) example with less ambiguous "element"/"elements"
  • As "import" / "imports" can be plural verb and plural noun as well, and that can be confusing with the relationship type naming convention.

[zvr]

Sorry, I do no understand this.

What are these two types of relationships (directional and directionless)?

And what does it mean that the relationshipType property "defines" from and to?

[bact]

What are these two types of relationships (directional and directionless)?

This is a directional relationship.

  graph LR;
    A[from] -->|directional relationship| B[to]

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This is a directionless relationship.

  graph LR;
    A[from] ---|non-directional relationship| B[to]

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Since v3.0.1 https://spdx.github.io/spdx-spec/v3.0.1/model/Core/Vocabularies/RelationshipType/, we have one directionless relationship type, which is "other":

other: Every to Element is related to the from Element where the relationship type is not described by any of the SPDX relationship types (this relationship is directionless).

The rest are directional.

--

And what does it mean that the relationshipType property "defines" from and to?

The text didn't say that.
It said the relationshipType defines the direction of a relationship.
This aligns with the last paragraph of RelationshipType description:

Relationship names should be descriptive enough to easily deduce the correct direction from their name.