The description argument similar to the image title argument argument, but allows allowing longer explanations without them appearing in cross references to the image.
For example, consider:
See this image: \x[image-description-argument-test-1].

\Image[Tank_man_standing_in_front_of_some_tanks.jpg]
{title=Tank man standing in front of some tanks}
{id=image-description-argument-test-1}
{description=Note how the tanks are green.}
{source=https://en.wikipedia.org/wiki/File:Tianasquare.jpg}
which renders as:
Figure 19. Tank man standing in front of some tanks. Source. Note how the tanks are green.
In this example, the reference \x[image-description-argument-test-1] expands just to
Tank man standing in front of some tanks
and does not include the description, which only shows on the image.
The description can be as large as you like. If it gets really large however, you might want to consider moving the image to its own header to keep things slightly saner. This will be especially true after we eventually do: github.com/cirosantilli/ourbigbook/issues/180.
If the description contains any element that would take its own separate line, like multiple paragraphs or a list, we automatically add a line grouping the description with the corresponding image to make that clearer, otherwise it can be hard to know which title corresponds to a far away image. Example with multiple paragraphs:
Stuff before the image.

\Image[Tank_man_standing_in_front_of_some_tanks.jpg]
{title=Tank man standing in front of some tanks}
{id=image-description-argument-test-2}
{source=https://en.wikipedia.org/wiki/File:Tianasquare.jpg}
{description=Note how the tanks are green.

But the shirt is white.}

Stuff after the image description.
which renders as:
Stuff before the image.
Figure 20. Tank man standing in front of some tanks. Source.
Note how the tanks are green.
But the shirt is white.
Stuff after the image description.
We recommend adding a period or other punctuation to the end of every description.

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