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* The "isRoot" member is included in the JSON only if its value would differ
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* from 'default_is_root'. Ordinarily 'default_is_root' should be false,
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* because ordinarily a table would be not be part of the root set if its
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* included in OVSDB, so in older schemas that do not include any "isRoot"
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* members, every table is implicitly part of the root set. To serialize such
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* a schema in a way that can be read by older OVSDB tools, specify