citationTree: add more examples/descriptions in spec

[kbrueckmann]

The specs mention:

The depth of a citation tree can be uneven. In a Ph.D. thesis, for example, the introduction may not be subdivided, while a chapter will often have subdivisions.

Would the following citationTree be sufficient in describing this fictional thesis (with the structure of either chapter->paragraph or chapter->section->paragraph)?

"citationTrees": [
    {
        "@type": "CitationTree",
        "citeStructure": [
            {
                "citeType": "chapter",
                "citeStructure": [
                    {
                        "citeType": "section",
                        "citeStructure": [
                            {
                                "citeType": "paragraph"
                            }
                        ]
                    }
                ]
            }
        ]
    }
]

This would mean that any descendant unit (here: paragraph) might appear directly after any of its ancestors (here: chapter). So, in a chapter, one might encounter either a section or a paragraph.

Or would I have to adjust the citationTree in such a way that all possible nested unit structures (chapter->paragraph and chapter->section->paragraph) are explicitly mentioned, e.g.:

"citationTrees": [
    {
        "@type": "CitationTree",
        "citeStructure": [
            {
                "citeType": "chapter",
                "citeStructure": [
                    {
                        "citeType": "section",
                        "citeStructure": [
                            {
                                "citeType": "paragraph"
                            }
                        ]
                    },
                    {
                        "citeType": "paragraph"
                    }
                ]
            }
        ]
    }
]

I think a few more examples of different – possibly more complicated – text structures (as graph diagram or as a short textual description) plus their corresponding citationTrees might be really helpful in the specs.