how can i understand this description in the l4re-source document?

Hello: In the page 19 of the l4re-source document there is a description about caps as following: Caps The table with application-specific named capabilities (default is an empty table). If the table does not contain a capability with the name ’rom’, the ’rom’ capability from Ned’s initial caps is inserted into the table. How can i understand "If the table does not contain a capability with the name ’rom’, the ’rom’ capability from Ned’s initial caps is inserted into the table." Thanks. Warm regards. Cheng Guanghui