This will take a few seconds, in which the container starts, xle parses the sentences and the results are written to a file. Afterwards, the container terminates.
<details>
<summary>Advanced tips</summary>
<summary>Advanced information</summary>
Note that the `xle` specified in the `docker run` command is the name of the tag you've given the image when building, _not_ the command to be executed (although under the hood the container will call a Linux command also called `xle`).
</details>
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@@ -72,6 +72,15 @@ This script is run inside the Docker container. It first creates an `xlerc` file
It then starts the headless X server, waits to ensure it has properly started and then executes the `xle` command. `xle` will load `xlerc`, create a parser, parse the sentence and display windows with the parse results.
<details>
<summary>Advanced information</summary>
There actually is a nice wrapper that starts an arbitrary command within a virtual X server environment taking care of everything for us. It is called [`xvfb-run`](https://manpages.ubuntu.com/manpages/trusty/man1/xvfb-run.1.html). We tried to use the wrapper in earlier versions of the image, but didn't manage to get it to work on the first try.
Still, it might be interesting to look into that more in the future.
</details>
As last step, we take a screenshot of the displayed windows, which is the output of the container.
:books: [How do I take a screen shot of my Xvfb buffer?][screenshot]
