Use Annotation behvior from Document/Article.
Silencio.
Add property getter for Figure.label.
Generalized TextView to be usable for string properties.
TextView for Figure.label.
Don't render id for custom property text views.
Options for TextView.
HeadingView reacts on changes of property 'level'.
Remove title from Heading.View.

This is too special. We need a different approach here.
E.g., one option would be to derive and add this speciality.
Experiments on implementing form kind of editing.
Update title on graph updates.
Add citation node type.
Adjust citation view.
Throw if CompositeView's getCharPosition is not implemented.
Remove the depency to substance-document.

As the nodes do not actively use the substance-document
it didn't make sense to have the dependency in this direction.

Now it is possible to use common nodes within substance-document
e.g., for testing.
Update url when changed.
Remove the id when rendering textish Node properties with TextView.
Updated package.json
An extra class to select real text nodes.
Introduce emphasis type.