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105function initializeNftConfig(
106    DIDRegisterList storage _self,
107    bytes32 _did,
108    uint256 _cap,
109    uint8 _royalties
110)
111internal
112{
113    require(_self.didRegisters[_did].owner != address(0), 'DID not stored');
114    
115    require(!_self.didRegisters[_did].nftInitialized, 'NFTs only can be initialized once');
116
117    require(_cap >= 0, 'Cap must be >=0'); // tautology
118
119    require(_royalties >= 0 && _royalties < 100, 'Invalid royalties number'); // first clause is tautology
120
121    _self.didRegisters[_did].mintCap = _cap;
122    _self.didRegisters[_did].royalties = _royalties;
123    _self.didRegisters[_did].nftInitialized = true;
124}