Source line to attribute the origin of a chart's data

Does Vega currently support a “source” directive to package metadata about the origin of the data with the chart?

In many charts published today this is reflected in a small, single line of text beneath the plot. An example can been see at the bottom of the chart below, published this month by The New York Times. It reads simply, Source: World Inequality Database.

I’d like to include similar lines with charts I make via Vega and Altair. Is there currently a means to do this, or is it something that would need to be added to the grammar?

[palewire]

I don’t know if I have a strong opinion on the distinction but a news graphic typically comes with these metadata:

• Headline (Covered now by title)
• Deck headline (A short sentence or two under the headline that describes the graphic. This to me seems most like a caption)
• Source line (fine print under the graphic listing origins of data)
• Footnote (optional fine print under the graphic listing any caveats in the data)
• Attribution: Footnote under the data listing the author(s)

On Sat, Dec 15, 2018, 9:02 AM Dominik Moritz <[e-mail] wrote:

Instead of source, we could have a general caption property (like ggplot).

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[ghing]

I know this was partially implemented in #1781, which added support for subtitles, but I would still like to see the ability to specify text below the chart added.

I agree with this comment in terms of the semantics for charts that I typically make.

However, even a single below-the-plot text element, similar to the caption argument to ggplot2’s labs() function would be better than nothing.