Allow Nested Element/Anchor Access

[johannes-wolf]

Allow accessing nested element anchors by registering elements insides groups via the element path.

Proposed syntax is to separate element names by slashes (like file-system paths):

group(name: "parent", {
  circle((), name: "child")
})

content("parent/child.center", [Example])

[fenjalien]

Is the slash actually necessary? With anchors now being functions, the group parent would receive "child.center" which would be identified as a child's anchor. If a default anchor is given ("child"), they could just override/take precedence over the group's anchors?

[johannes-wolf]

Without a slash, how should we know if "elem.abc" is "elem.abc" or "elem.abc.default"? By probing if the anchor "abc" returns something and falling back to "default" otherwise?