[Xmldb-org-xupdate] append and insert-*: redundant?

[John L. C. <jl...@po...>]

Is it true that xupdate:insert-after and xupdate:insert-before provide a
proper subset of the functionality of xupdate:append?  In particular,
xupdate:append can be used to create a new child of the context node
in the case where there were no children of that context node, but in
those cases where there are children of a context node, it seems that
you could use xupdate:append or one of xupdate:insert-after and
xupdate:insert-before interchangeably.

If this observation is correct, then why do xupdate:insert-after and
xupdate:insert-before exist?

Take care,

    John L. Clark