You are looking at the HTML representation of the YAML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
---
query:
  namespaces:
    -
      id: -2
      case: first-letter
      '*': Média
      canonical: Media
    -
      id: -1
      case: first-letter
      '*': Speciální
      canonical: Special
    -
      id: 0
      case: first-letter
      '*':
      content:
    -
      id: 1
      case: first-letter
      '*': Diskuse
      subpages:
      canonical: Talk
    -
      id: 2
      case: first-letter
      '*': Uživatel
      subpages:
      canonical: User
    -
      id: 3
      case: first-letter
      '*': Uživatel diskuse
      subpages:
      canonical: User talk
    -
      id: 4
      case: first-letter
      '*': Rokypedie
      canonical: Project
    -
      id: 5
      case: first-letter
      '*': Rokypedie diskuse
      subpages:
      canonical: Project talk
    -
      id: 6
      case: first-letter
      '*': Soubor
      canonical: File
    -
      id: 7
      case: first-letter
      '*': Soubor diskuse
      subpages:
      canonical: File talk
    -
      id: 8
      case: first-letter
      '*': MediaWiki
      subpages:
      canonical: MediaWiki
    -
      id: 9
      case: first-letter
      '*': MediaWiki diskuse
      subpages:
      canonical: MediaWiki talk
    -
      id: 10
      case: first-letter
      '*': Šablona
      canonical: Template
    -
      id: 11
      case: first-letter
      '*': Šablona diskuse
      subpages:
      canonical: Template talk
    -
      id: 12
      case: first-letter
      '*': Nápověda
      canonical: Help
    -
      id: 13
      case: first-letter
      '*': Nápověda diskuse
      subpages:
      canonical: Help talk
    -
      id: 14
      case: first-letter
      '*': Kategorie
      canonical: Category
    -
      id: 15
      case: first-letter
      '*': Kategorie diskuse
      subpages:
      canonical: Category talk