Data traversal?

[madeleineostoja]

Allow simpla-paths to traverse up/down the tree in attributes, using dot notation inside SIDs/GIDs. Fixes the use-case where markup structure doesn't perfectly match content structure, especially with shared code and complex content models

• foo.bar to traverse down a tree

• ..baz to traverse up a tree (additional dot for each level up)

• Can combine patterns, eg: ..baz.qux

• Can traverse in both SIDs and GIDs (obvs GIDs can only traverse down, useful for removing unecssary nesting)

• If the key accessed with traversing doesn’t exist, it is created as per usual