Nestle 1904 GNT - Feature: parent

Feature group	Feature type	Data type	Available for node types	Used by viewtypes
`Relational`	`Edge`	`String`	`word` `wg` `Sentence` `verse` `chapter` `Book` `phrase` `subphrase`	`syntax-view` `wg-view`

Feature description

The parent feature indicates the edge between a node and its parent node. It can be used to query upon hierarchical relationships within the syntactic structure.

Feature value

Any of the following:

Zero node value - node has no parent
One node value - node has one parent
Two node values - node has two parents

Notes

Usually, any node would have just one parent. However, in our implementation, word nodes have two parents due to the partial data duplication required to support the ‘wg-view’ and the ‘syntax-view’ within a single database.

Example Query

The following query demonstrates a typical use of the parent feature. The following query selects only instances where wg2 is a child of wg1 and w1 is a child of wg1:

Query = '''
wg1:wg type=modifier-scope
  w1:word lemma=ἐλπίς
  wg2:wg rule=DetNP
wg2 -parent> wg1
w1 -parent> wg1
'''
Results = A.search(Query)
 0.24s 6 results

Part of the results is shown below in the (default) syntax-view:

The same section is shown in the wg-view:

The parent-child relation can be checked using the functions E.parent.f(). For example the parent nodes for word node 82843:

 E.parent.f(82843)
   (454458, 246648)
 F.otype.v(246648)
   'phrase'
 F.otype.v(454458)
   'wg'

This output shows the word node has two parents: a phrase and a wg node. This dual parent relation is a consequence of implementing two view types:

syntax-view (default): display syntax trees using linguistic terms like phrases and clauses.
wg-view: display syntax trees in a more agnostic manner by means of word groups.

The following image shows how the parent feature operates on various node types. The node type ‘subphrase’ is not part of this parent-child relation schema.

Feature parent can also be used to identify the child node(s) by calling function E.parent.t(…):

E.parent.f(246649)
  (246648,)

Source description

This feature is calculated during dataset creation.

N1904-TF