Incorrect diagram when class name has a digit at the beginning

[andrew2net]

In case a class name has a digit at the beginning of its name a diagram is rendered incorrectly.

diagram IeeeMetadata {
  class 3gppBibliographicItem {
    +doctype: DocumentType
  }

  enum DocumentType {
    TR
    TS
  }

  association {
    owner BibliographicItem
    member 3gppBibliographicItem
    owner_type inheritance
  }

  association {
    owner DocumentType
    member 3gppBibliographicItem
    member_type direct
  }
}