PROTO BlockElement [
      exposedField SFString   elementType "BLOCKELEMENT"
      exposedField SFVec3f    position    0 0 0
      exposedField SFBool     linebreak   FALSE
      
      exposedField SFBool     absolute    FALSE
      
      exposedField SFInt32    startLevel  -1
      exposedField SFInt32    endLevel    -1
      eventIn      SFInt32    showLevel
  
      exposedField SFString href        ""
  
      exposedField SFFloat    width       1
      exposedField SFFloat    height      1
  
      exposedField MFString   justify ["BEGIN"]
  
      exposedField SFVec3f    location    0 0 0
      exposedField SFRotation rotation    0 1 0 0
      exposedField SFVec3f    scale       1 1 1
      exposedField MFNode     block    []
  ] {