| ds | - The PetscDS object
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| type | - The type of condition, e.g. DM_BC_ESSENTIAL/DM_BC_ESSENTIAL_FIELD (Dirichlet), or DM_BC_NATURAL (Neumann)
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| name | - The BC name
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| labelname | - The label defining constrained points
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| field | - The field to constrain
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| numcomps | - The number of constrained field components
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| comps | - An array of constrained component numbers
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| bcFunc | - A pointwise function giving boundary values
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| numids | - The number of DMLabel ids for constrained points
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| ids | - An array of ids for constrained points
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| ctx | - An optional user context for bcFunc
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