HowToDirection: HowToDirection
In cboettig/schemar: Create Structured Data Using the Schema.org Vocabulary

A direction indicating a single action to do in the instructions for how to achieve a result.

HowToDirection(id = NULL, totalTime = NULL, tool = NULL, supply = NULL,
  prepTime = NULL, performTime = NULL, duringMedia = NULL,
  beforeMedia = NULL, afterMedia = NULL, previousItem = NULL,
  position = NULL, nextItem = NULL, item = NULL, url = NULL,
  sameAs = NULL, potentialAction = NULL, name = NULL,
  mainEntityOfPage = NULL, image = NULL, identifier = NULL,
  disambiguatingDescription = NULL, description = NULL,
  alternateName = NULL, additionalType = NULL)

`id`	identifier for the object (URI)
`totalTime`	(Duration or Duration type.) The total time required to perform instructions or a direction (including time to prepare the supplies), in [ISO 8601 duration format](http://en.wikipedia.org/wiki/ISO_8601).
`tool`	(Text or HowToTool or Text or HowToTool type.) A sub property of instrument. An object used (but not consumed) when performing instructions or a direction.
`supply`	(Text or HowToSupply or Text or HowToSupply type.) A sub-property of instrument. A supply consumed when performing instructions or a direction.
`prepTime`	(Duration or Duration type.) The length of time it takes to prepare the items to be used in instructions or a direction, in [ISO 8601 duration format](http://en.wikipedia.org/wiki/ISO_8601).
`performTime`	(Duration or Duration type.) The length of time it takes to perform instructions or a direction (not including time to prepare the supplies), in [ISO 8601 duration format](http://en.wikipedia.org/wiki/ISO_8601).
`duringMedia`	(MediaObject type.) A media object representing the circumstances while performing this direction.
`beforeMedia`	(MediaObject type.) A media object representing the circumstances before performing this direction.
`afterMedia`	(MediaObject type.) A media object representing the circumstances after performing this direction.
`previousItem`	(ListItem type.) A link to the ListItem that preceeds the current one.
`position`	(Text or Integer or Text or Integer type.) The position of an item in a series or sequence of items.
`nextItem`	(ListItem type.) A link to the ListItem that follows the current one.
`item`	(Thing or Thing type.) An entity represented by an entry in a list or data feed (e.g. an 'artist' in a list of 'artists')’.
`url`	(URL type.) URL of the item.
`sameAs`	(URL type.) URL of a reference Web page that unambiguously indicates the item's identity. E.g. the URL of the item's Wikipedia page, Wikidata entry, or official website.
`potentialAction`	(Action type.) Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.
`name`	(Text type.) The name of the item.
`mainEntityOfPage`	(URL or CreativeWork type.) Indicates a page (or other CreativeWork) for which this thing is the main entity being described. See [background notes](/docs/datamodel.html#mainEntityBackground) for details.
`image`	(URL or ImageObject type.) An image of the item. This can be a [[URL]] or a fully described [[ImageObject]].
`identifier`	(URL or Text or PropertyValue type.) The identifier property represents any kind of identifier for any kind of [[Thing]], such as ISBNs, GTIN codes, UUIDs etc. Schema.org provides dedicated properties for representing many of these, either as textual strings or as URL (URI) links. See [background notes](/docs/datamodel.html#identifierBg) for more details.
`disambiguatingDescription`	(Text type.) A sub property of description. A short description of the item used to disambiguate from other, similar items. Information from other properties (in particular, name) may be necessary for the description to be useful for disambiguation.
`description`	(Text type.) A description of the item.
`alternateName`	(Text type.) An alias for the item.
`additionalType`	(URL type.) An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. This is a relationship between something and a class that the thing is in. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. Schema.org tools may have only weaker understanding of extra types, in particular those defined externally.