visualization := [creator date id? lang name style type version]
    extension?
    userSource
    (sourceVariable | derivedVariable)+
    graph
    labelFrame+
    container?
    style+
    layerController?

extension :=
    [(combinedFootnotes
      | from helpId
      | minWidthSet maxWidthSet
      | showGridline)?
     numRows?
     id?]
      
userSource := [id missing?]

sourceVariable :=
    [id categorical source sourceName dependsOn? label? labelVariable?]
    extension* (format | stringFormat)?
derivedVariable :=
    [id categorical value dependsOn?]
    extension* (format | stringFormat valueMapEntry*)?
valueMapEntry := [id? from to]

format :=
    [errorCharacter?
     (minimumFractionDigits maximumFractionDigits)? /* maybe not for baseFormat=dateTime */
     baseFormat?
     (baseFormat=dateTime or baseFormat=elapsedTime:
      dayPadding hourFormat hourPadding minutePadding showDay showSecond)
     (baseFormat=dateTime only:
      dayOfMonthPadding dayType monthFormat showMonth showYear yearAbbreviation separatorChars mdyOrder)
     (baseFormat=elapsedTime only:
      secondPadding showMillis useGrouping)]
    (affix+ | relabel)?
dateTimeFormat :=
    [baseFormat
     (baseFormat=dateTime:
      dayOfMonthPadding dayPadding dayType hourFormat hourPadding mdyOrder minutePadding monthFormat separatorChars showDay showHour showMinute showMonth showSecond showYear yearAbbreviation)
     (baseFormat=time:
      hourFormat hourPadding minutePadding secondPadding showHour showMillis showMinute showSecond)]
numberFormat :=
    [minimumIntegerDigits minimumFractionDigits maximumFractionDigits
     (scientific small | suffix) useGrouping]
    affix?
stringFormat := (affix | relabel+)?
affix := [id? definesReference position suffix value]
relabel := [from to]

graph :=
    [id cellStyle style]
    location+ coordinates faceting facetLayout interval

location := [id? method part (min | target | value)?]

coordinates := [id]
faceting := [id] cross layer*
interval := [id style] labeling footnotes?
labeling := [id? style? variable] (format | formatting | footnotes)*
formatting := [id? variable] formatMapping*
formatMapping := [id? from] format
footnotes := [id? superscript variable] footnoteMapping+
footnoteMapping := [id? from to definesReference]

cross := [id?] nest nest
nest := [id?] variableReference+
variableReference := [ref]

facetLayout := [id?] tableLayout facetLevel+ setCellProperties*
tableLayout := [(id style)? fitCells? verticalTitlesInCorner]
facetLevel := [id gap level] axis

axis := [id? style] label? majorTicks
label :=
    [id? style (purpose | textFrameStyle | purpose textFrameStyle)]
    descriptionGroup | text+
majorTicks := [id labelAngle length style tickFrameStyle] gridline?
gridline := [id style zOrder]

descriptionGroup := [id? separator target] description+ text
description := [id? name]
text := [id? (usesReference | definesReference position)?] <text>
paragraph := [id? hangingIndent]

setCellProperties :=
    [id? applyToConverse]
    setMetaData setStyle* setFormat+ union?
setMetaData := [id? key target value]
setStyle := [id? style target]
setFormat :=
    [id? target reset?]
    dateTimeFormat | format | numberFormat | stringFormat+

labelFrame := [id style] location+ label paragraph?
container := [id style] extension? location+ labelFrame+

style :=
    [id
     (border-bottom border-bottom-color?)?
     (border-left border-left-color?)?
     (border-right border-right-color?)?
     (border-top border-top-color?)
     (color? color2)?
     width?]
style :=
    [id
     font-family?
     font-size?
     font-style?
     font-weight?
     labelAngle?
     labelLocationHorizontal?
     (labelLocationVertical
      margin-bottom margin-left margin-right margin-top
      textAlignment
      size?)?
     visible?
     color? color2?]
     
layer := [id? value variable method? visible?]
layerController := [id? source target]

union := [id] intersect+
intersect := [id?] intersectWhere | where+
intersectWhere := [id variable variable2]
where := [id? include variable]