private MergeByAttr(MergeFlags flags, string attrName) : base(flags) => this.FAttrName = attrName;
public MergeByNodeName(MergeFlags flags) : base(flags) { }
public MergeByNameAttr(MergeFlags mergeFlags) : base(mergeFlags) { }
public NoMerge(MergeFlags flags) : base(flags) { }
protected MergeInfo(MergeFlags flags) => this.Flags = flags;