The credit element's subelements link, bookmark, credit-image, credit-words, and credit-symbol are collectively implemented as credit_display records.

A credit has a list of credit display items, joined on field credit_id.

credit_display is a single-inheritance table, discriminator column credit_display_type.

Discriminator values are:

• credit image
• credit words
• credit symbol
• link
• bookmark

Both link and bookmark are types of music data. A link or bookmark record is in the music_data table, music_data_type link or bookmark, and joined to credit_display on fields link_id or bookmark_id

Credit image is a type of image, a direction type, discriminator field direction_type_type value image. Foreign key in credit_display is image_id.

Credit words and credit symbol are formatted text types, so text, formatting, and display values are stored in tables text_format and display.