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    Network interface context query.

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    policy          The policy to query.

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    user            The criteria to match the context's user.
    user_regex      If true, regular expression matching
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    role            The criteria to match the context's role.
    role_regex      If true, regular expression matching
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    type_           The criteria to match the context's type.
    type_regex      If true, regular expression matching
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    range_          The criteria to match the context's range.
    range_subset    If true, the criteria will match if it is a subset
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    range_overlap   If true, the criteria will match if it overlaps
                    any of the context's range.
    range_superset  If true, the criteria will match if it is a superset
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    range_proper    If true, use proper superset/subset operations.
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