# [ref_impl_eiffel] [840] Correct differential path analysis and generation - replaced the ARCHETYPE_CONSTRAINT.is_congruent notion by a slightly different one - is_mergeable, which means that the node should be overlaid piecemeal rather than used as a tota

**Category:** [Reference Implementation: Eiffel (archive)](https://discourse.openehr.org/c/reference-implementation-eiffel-archive/161)
**Created:** 2009-03-13 17:19 UTC
**Views:** 2
**Replies:** 0
**URL:** https://discourse.openehr.org/t/ref-impl-eiffel-840-correct-differential-path-analysis-and-generation-replaced-the-archetype-constraint-is-congruent-notion-by-a-slightly-different-one-is-mergeable-which-means-that-the-node-should-be-overlaid-piecemeal-rather-than-used-as-a-tota/14130

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## Post #1 by @svn1

Revision: 840
Author:   thomas\.beale

Log Message:

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**Canonical:** https://discourse.openehr.org/t/ref-impl-eiffel-840-correct-differential-path-analysis-and-generation-replaced-the-archetype-constraint-is-congruent-notion-by-a-slightly-different-one-is-mergeable-which-means-that-the-node-should-be-overlaid-piecemeal-rather-than-used-as-a-tota/14130
**Original content:** https://discourse.openehr.org/t/ref-impl-eiffel-840-correct-differential-path-analysis-and-generation-replaced-the-archetype-constraint-is-congruent-notion-by-a-slightly-different-one-is-mergeable-which-means-that-the-node-should-be-overlaid-piecemeal-rather-than-used-as-a-tota/14130