# [ref_impl_eiffel] [457] Added classes and routines to properly iterate through Assertion expression trees, with or without a visitor.

**Category:** [Reference Implementation: Eiffel (archive)](https://discourse.openehr.org/c/reference-implementation-eiffel-archive/161)
**Created:** 2008-01-23 11:42 UTC
**Views:** 2
**Replies:** 0
**URL:** https://discourse.openehr.org/t/ref-impl-eiffel-457-added-classes-and-routines-to-properly-iterate-through-assertion-expression-trees-with-or-without-a-visitor/12738

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## Post #1 by @svn1

Revision: 457
Author:   thomas\.beale

Log Message:

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**Canonical:** https://discourse.openehr.org/t/ref-impl-eiffel-457-added-classes-and-routines-to-properly-iterate-through-assertion-expression-trees-with-or-without-a-visitor/12738
**Original content:** https://discourse.openehr.org/t/ref-impl-eiffel-457-added-classes-and-routines-to-properly-iterate-through-assertion-expression-trees-with-or-without-a-visitor/12738