visualization
   :creator
   :date
   :lang
   :name
   :style[style_ref]=ref style
   :type
   :version
   :schemaLocation?
=> visualization_extension?
   userSource
   (sourceVariable | derivedVariable)+
   categoricalDomain?
   graph
   labelFrame[lf1]*
   container?
   labelFrame[lf2]*
   style+
   layerController?

extension[visualization_extension]
   :numRows=int?
   :showGridline=bool?
   :minWidthSet=(true)?
   :maxWidthSet=(true)?
=> EMPTY

userSource :missing=(listwise | pairwise)? => EMPTY   # Related to omit_empty?

categoricalDomain => variableReference simpleSort

simpleSort :method[sort_method]=(custom) => categoryOrder

sourceVariable
   :id
   :categorical=(true)
   :source
   :domain=ref categoricalDomain?
   :sourceName
   :dependsOn=ref sourceVariable?
   :label?
   :labelVariable=ref sourceVariable?
=> variable_extension* (format | stringFormat)?

derivedVariable
   :id
   :categorical=(true)
   :value
   :dependsOn=ref sourceVariable?
=> variable_extension* (format | stringFormat)? valueMapEntry*

extension[variable_extension] :from :helpId => EMPTY

valueMapEntry :from :to => EMPTY

categoryOrder => TEXT

graph
   :cellStyle=ref style
   :style=ref style
=> location+ coordinates faceting facetLayout interval

location
   :part=(height | width | top | bottom | left | right)
   :method=(sizeToContent | attach | fixed | same)
   :min=dimension?
   :max=dimension?
   :target=ref (labelFrame | graph | container)?
   :value?
=> EMPTY

coordinates => EMPTY

faceting => layer[layers1]* cross layer[layers2]*

cross => (unity | nest) (unity | nest)

nest => variableReference[vars]+

unity => EMPTY

variableReference :ref=ref (sourceVariable | derivedVariable) => EMPTY

layer
   :variable=ref (sourceVariable | derivedVariable)
   :value
   :visible=bool?
   :method[layer_method]=(nest)?
   :titleVisible=bool?
=> EMPTY

facetLayout => tableLayout setCellProperties[scp1]*
               facetLevel+ setCellProperties[scp2]*

tableLayout
   :verticalTitlesInCorner=bool
   :style=ref style?
   :fitCells=(ticks both)?
=> EMPTY

facetLevel :level=int :gap=dimension? => axis

axis :style=ref style => label? majorTicks

label
   :style=ref style
   :textFrameStyle=ref style?
   :purpose=(title | subTitle | subSubTitle | layer | footnote)?
=> text+ | descriptionGroup

descriptionGroup
   :target=ref faceting
   :separator?
=> (description | text)+

description :name=(variable | value) => EMPTY

majorTicks
   :labelAngle=int
   :length=dimension
   :style=ref style
   :tickFrameStyle=ref style
   :labelFrequency=int?
   :stagger=bool?
=> gridline?

gridline
   :style=ref style
   :zOrder=int
=> EMPTY

setCellProperties
   :applyToConverse=bool?
=> (setStyle | setFrameStyle | setFormat | setMetaData)* union[union_]?

setStyle
   :target=ref (labeling | graph | interval | majorTicks)
   :style=ref style
=> EMPTY

setMetaData
   :target=ref graph
   :key
   :value
=> EMPTY

setFormat
   :target=ref (majorTicks | labeling)
   :reset=bool?
=> format | numberFormat | stringFormat+ | dateTimeFormat | elapsedTimeFormat

setFrameStyle
   :style=ref style
   :target=ref majorTicks
=> EMPTY

format
   :baseFormat[f_base_format]=(date | time | dateTime | elapsedTime)?
   :errorCharacter?
   :separatorChars?
   :mdyOrder=(dayMonthYear | monthDayYear | yearMonthDay)?
   :showYear=bool?
   :showQuarter=bool?
   :quarterPrefix?
   :quarterSuffix?
   :yearAbbreviation=bool?
   :showMonth=bool?
   :monthFormat=(long | short | number | paddedNumber)?
   :dayPadding=bool?
   :dayOfMonthPadding=bool?
   :showWeek=bool?
   :weekPadding=bool?
   :weekSuffix?
   :showDayOfWeek=bool?
   :dayOfWeekAbbreviation=bool?
   :hourPadding=bool?
   :minutePadding=bool?
   :secondPadding=bool?
   :showDay=bool?
   :showHour=bool?
   :showMinute=bool?
   :showSecond=bool?
   :showMillis=bool?
   :dayType=(month | year)?
   :hourFormat=(AMPM | AS_24 | AS_12)?
   :minimumIntegerDigits=int?
   :maximumFractionDigits=int?
   :minimumFractionDigits=int?
   :useGrouping=bool?
   :scientific=(onlyForSmall | whenNeeded | true | false)?
   :small=real?
   :prefix?
   :suffix?
   :tryStringsAsNumbers=bool?
   :negativesOutside=bool?
=> relabel* affix*

numberFormat
   :minimumIntegerDigits=int?
   :maximumFractionDigits=int?
   :minimumFractionDigits=int?
   :useGrouping=bool?
   :scientific=(onlyForSmall | whenNeeded | true | false)?
   :small=real?
   :prefix?
   :suffix?
=> affix*

stringFormat => relabel* affix*

dateTimeFormat
   :baseFormat[dt_base_format]=(date | time | dateTime)
   :separatorChars?
   :mdyOrder=(dayMonthYear | monthDayYear | yearMonthDay)?
   :showYear=bool?
   :yearAbbreviation=bool?
   :showQuarter=bool?
   :quarterPrefix?
   :quarterSuffix?
   :showMonth=bool?
   :monthFormat=(long | short | number | paddedNumber)?
   :showWeek=bool?
   :weekPadding=bool?
   :weekSuffix?
   :showDayOfWeek=bool?
   :dayOfWeekAbbreviation=bool?
   :dayPadding=bool?
   :dayOfMonthPadding=bool?
   :hourPadding=bool?
   :minutePadding=bool?
   :secondPadding=bool?
   :showDay=bool?
   :showHour=bool?
   :showMinute=bool?
   :showSecond=bool?
   :showMillis=bool?
   :dayType=(month | year)?
   :hourFormat=(AMPM | AS_24 | AS_12)?
=> affix*

elapsedTimeFormat
   :baseFormat[dt_base_format]=(date | time | dateTime)
   :dayPadding=bool?
   :hourPadding=bool?
   :minutePadding=bool?
   :secondPadding=bool?
   :showYear=bool?
   :showDay=bool?
   :showHour=bool?
   :showMinute=bool?
   :showSecond=bool?
   :showMillis=bool?
=> affix*

affix
   :definesReference=int
   :position=(subscript | superscript)
   :suffix=bool
   :value
=> EMPTY

relabel :from=real :to => EMPTY

union => intersect+

intersect => where+ | intersectWhere | alternating | EMPTY

where
   :variable=ref (sourceVariable | derivedVariable)
   :include
=> EMPTY

intersectWhere
   :variable=ref (sourceVariable | derivedVariable)
   :variable2=ref (sourceVariable | derivedVariable)
=> EMPTY

alternating => EMPTY

text
   :usesReference=int?
   :definesReference=int?
   :position=(subscript | superscript)?
   :style=ref style
=> TEXT

interval :style=ref style => labeling footnotes?

labeling
   :style=ref style?
   :variable=ref (sourceVariable | derivedVariable)
=> (formatting | format | footnotes)*

formatting :variable=ref (sourceVariable | derivedVariable) => formatMapping*

formatMapping :from=int => format?

footnotes
   :superscript=bool?
   :variable=ref (sourceVariable | derivedVariable)
=> footnoteMapping*

footnoteMapping :definesReference=int :from=int :to => EMPTY

style
   :color=color?
   :color2=color?
   :labelAngle=real?
   :border-bottom=(solid | thick | thin | double | none)?
   :border-top=(solid | thick | thin | double | none)?
   :border-left=(solid | thick | thin | double | none)?
   :border-right=(solid | thick | thin | double | none)?
   :border-bottom-color?
   :border-top-color?
   :border-left-color?
   :border-right-color?
   :font-family?
   :font-size?
   :font-weight=(regular | bold)?
   :font-style=(regular | italic)?
   :font-underline=(none | underline)?
   :margin-bottom=dimension?
   :margin-left=dimension?
   :margin-right=dimension?
   :margin-top=dimension?
   :textAlignment=(left | right | center | decimal | mixed)?
   :labelLocationHorizontal=(positive | negative | center)?
   :labelLocationVertical=(positive | negative | center)?
   :decimal-offset=dimension?
   :size?
   :width?
   :visible=bool?
=> EMPTY

layerController
   :source=(tableData)
   :target=ref label?
=> EMPTY

container :style=ref style => container_extension? location+ labelFrame*

extension[container_extension] :combinedFootnotes=(true) => EMPTY

labelFrame :style=ref style => location+ label? paragraph?

paragraph :hangingIndent=dimension? => EMPTY