Language 
  Name
  Description
  Family tree
  Contact languages
  Status
  Codes
  Alternative names
  Location
  Number of speakers

Corpus:
  Metadata
  Texts
    Text:
      Metadata
        Speaker(s)
        Linguist(s)
        Date
        Place
        Topic
        Keywords
        Languages
      Sentences

Lexicon
  Metadata
    Language name
    Number of words
    Speakers
    Sources
  Words
    Word:
      form
      gloss
      …

Grammatical categories
  Category:
    Name      nominative
    Category  case
    Symbol    NOM


Grammar
  Phonology
    Sounds
      Consonants
      Vowels
      Tone

  Morphology

  Syntax

  Discourse