.. _model-hierarchical_tagging:

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hierarchical_tagging
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Enables hierarchical evaluation tagging


.. toctree::
   :hidden:
   :maxdepth: 1



**Specification**

- *Alias:* None

- *Arguments:* None

- *Default:* no hierarchical tagging


**Description**


The hierarchical tagging option is useful for studies involving
multiple models with a nested or hierarchical relationship.  For
example a nested model has a sub-method, which itself likely operates
on a sub-model, or a hierarchical approximation involves coordination
of low and high fidelity models.  Specifying ``hierarchical_tagging``
will yield function evaluation identifiers ("tags") composed of the
evaluation IDs of the models involved, e.g.,
outermodel.innermodel.interfaceid = 4.9.2.  This communicates the
outer contexts to the analysis driver when performing a function
evaluation.



**Examples**


test/dakota_uq_timeseries_ivp_optinterf.in
test/dakota_uq_timeseries_sop_optinterf.in