| The TocAnchor class represents an anchor, which is used as a point
of inclusion for other tables of contents.
For instance, if TOC A contains the anchor with ID "PDE"
and TOC B has the "PDE" ID in its link_to attribute,
then the contents of TOC B will replace the anchor specified by
TOC A at runtime.
TOC anchors cannot have any content within them, so they are leaf objects.
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