Alignment¶

bcql_py.models.alignment ¶

Alignment queries use the ==> operator to find cross-field alignments between versions of a parallel corpus (e.g. English -> Dutch).

Similar to models/relation but with different operators and semantics.

AlignmentOperator ¶

Bases: BCQLNode

The operator in an alignment query: =type=>field or ==>field?.

See https://github.com/instituutnederlandsetaal/BlackLab/blob/dev/site/docs/guide/040_query-language/030_parallel.md

Attributes:

Name	Type	Description
`target_field`	`str`	The target field name (e.g. `"nl"`).
`optional`	`bool`	`True` when alignment is optional (`==>nl?`).
`relation_type`	`str \| None`	Optional type filter (e.g. `"word"` in `=word=>nl`). `None` means any alignment relation
`capture_name`	`str \| None`	Override for the capture group name (default `"rels"`). Set by `name:==>field` syntax

AlignmentConstraint ¶

Bases: BCQLNode

One alignment constraint: operator target

Multiple alignment constraints are separated by ;.

Attributes:

Name	Type	Description
`operator`	`AlignmentOperator`	The AlignmentOperator.
`target`	`BCQLNodeUnion`	The target sub-query.

AlignmentNode ¶

Bases: BCQLNode

A parallel alignment query: source ==>field target [; ==>field target]*. Attributes: source: The source query in the primary field alignments: One or more alignment constraints.