Markup for deep (tectogrammatical) word order, which is based on communicative dynamism and related to topic and focus (see the <tfa> element). Every node (as represented by the <f>, <fadd> and (exceptionally) <d> elements) gets a numerical ID. Since it is numerical (even though not necessarily integer), an order is well defined; this order is then used for left-to-right ordering of nodes on every level in the tree. It is partial ordering in the sense that we do not require total ordering (but we can always extend it to be total, in many ways). In practice, the ordering is total.
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