DAGMC Cell Override Updates#3888

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pshriwise wants to merge 16 commits intoopenmc-dev:developfrom

pshriwise:dagmc-cell-overrides

Commits on Mar 22, 2026

Changing over to the cell subelement approach for DAGMC universes
pshriwise
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Replace material overrides with standard cell specification subelements
pshriwise
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Add implicit complement name to DAGMC cell durin sync DAGMC universes
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Refactor cell XML parsing into shared free functions

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Add DAGMCCell.from_xml_element, reuse Cell parsing logic

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Add density and volume override support to DAGMC cell spec

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Add unit test for DAGMCCell.from_xml_element

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Add backward compatibility for deprecated <material_overrides> XML schema

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Apply clang-format to C++ files changed in this branch

pshriwise
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Remove deprecated material_overrides property and related methods

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Pass DAGMCUniverse to DAGMCCell.from_xml_element, drop _NullUniverse stub

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Update <dagmc_universe> IO format docs for new <cell> sub-element schema

pshriwise
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Re-add material_overrides property raising AttributeError on access

pshriwise
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Make universe required in DAGMCCell.from_xml_element, remove stub

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Add type check for universe argument in DAGMCCell.from_xml_element

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Fix test assertions for scalar temperature/density in Cell.from_xml_element

pshriwise
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claude
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DAGMC Cell Override Updates#3888

DAGMC Cell Override Updates#3888
pshriwise wants to merge 16 commits intoopenmc-dev:developfrom
pshriwise:dagmc-cell-overrides

Commits on Mar 22, 2026

Changing over to the cell subelement approach for DAGMC universes

Replace material overrides with standard cell specification subelements

Add implicit complement name to DAGMC cell durin sync DAGMC universes

Refactor cell XML parsing into shared free functions

Add DAGMCCell.from_xml_element, reuse Cell parsing logic

Add density and volume override support to DAGMC cell spec

Add unit test for DAGMCCell.from_xml_element

Add backward compatibility for deprecated <material_overrides> XML schema

Apply clang-format to C++ files changed in this branch

Remove deprecated material_overrides property and related methods

Pass DAGMCUniverse to DAGMCCell.from_xml_element, drop _NullUniverse stub

Update <dagmc_universe> IO format docs for new <cell> sub-element schema

Re-add material_overrides property raising AttributeError on access

Make universe required in DAGMCCell.from_xml_element, remove stub

Add type check for universe argument in DAGMCCell.from_xml_element

Fix test assertions for scalar temperature/density in Cell.from_xml_element