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
      '*': Media
      canonical: Media
    -
      id: -1
      case: first-letter
      '*': Special
      canonical: Special
    -
      id: 0
      case: first-letter
      '*':
      content:
    -
      id: 1
      case: first-letter
      '*': Talk
      subpages:
      canonical: Talk
    -
      id: 2
      case: first-letter
      '*': User
      subpages:
      canonical: User
    -
      id: 3
      case: first-letter
      '*': User talk
      subpages:
      canonical: User talk
    -
      id: 4
      case: first-letter
      '*': Navigators
      canonical: Project
    -
      id: 5
      case: first-letter
      '*': NavigatorsTalk
      subpages:
      canonical: Project talk
    -
      id: 6
      case: first-letter
      '*': File
      canonical: File
    -
      id: 7
      case: first-letter
      '*': File talk
      subpages:
      canonical: File talk
    -
      id: 8
      case: first-letter
      '*': MediaWiki
      subpages:
      canonical: MediaWiki
    -
      id: 9
      case: first-letter
      '*': MediaWiki talk
      subpages:
      canonical: MediaWiki talk
    -
      id: 10
      case: first-letter
      '*': Template
      canonical: Template
    -
      id: 11
      case: first-letter
      '*': Template talk
      subpages:
      canonical: Template talk
    -
      id: 12
      case: first-letter
      '*': Help
      canonical: Help
    -
      id: 13
      case: first-letter
      '*': Help talk
      subpages:
      canonical: Help talk
    -
      id: 14
      case: first-letter
      '*': Category
      canonical: Category
    -
      id: 15
      case: first-letter
      '*': Category talk
      subpages:
      canonical: Category talk
    -
      id: 100
      case: first-letter
      '*': Publication
      canonical: Publication
    -
      id: 101
      case: first-letter
      '*': PublicationTalk
      canonical: PublicationTalk
    -
      id: 120
      case: first-letter
      '*': Project
      canonical: Project
    -
      id: 121
      case: first-letter
      '*': ProjectTalk
      canonical: ProjectTalk
    -
      id: 140
      case: first-letter
      '*': Person
      canonical: Person
    -
      id: 141
      case: first-letter
      '*': PersonTalk
      canonical: PersonTalk
    -
      id: 150
      case: first-letter
      '*': ResearchLine
      canonical: ResearchLine
    -
      id: 151
      case: first-letter
      '*': ResearchLineTalk
      canonical: ResearchLineTalk
    -
      id: 200
      case: first-letter
      '*': Private
      canonical: Private
    -
      id: 201
      case: first-letter
      '*': PrivateTalk
      canonical: PrivateTalk
    -
      id: 250
      case: first-letter
      '*': Candidate
      canonical: Candidate
      content:
    -
      id: 251
      case: first-letter
      '*': CandidateTalk
      canonical: CandidateTalk
    -
      id: 302
      case: first-letter
      '*': Property
      canonical: Property
    -
      id: 303
      case: first-letter
      '*': Property talk
      subpages:
      canonical: Property talk
    -
      id: 306
      case: first-letter
      '*': Form
      canonical: Form
    -
      id: 307
      case: first-letter
      '*': Form talk
      subpages:
      canonical: Form talk
    -
      id: 308
      case: first-letter
      '*': Concept
      canonical: Concept
    -
      id: 309
      case: first-letter
      '*': Concept talk
      canonical: Concept talk