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This page is in active development and may undergo frequent changes.
Archetypes
Archetypes are defined by the setcode data value in the .cdb file, and they are 4 hexadecimal digits long (0x0001 to 0xFFFF). The first of those 4 digits is what is called a "sub-archetype" (an archetype within an archetype, such as "Cyber Dragon", from "Cyber").
Multiple Archetypes
You simply concatenate (link together) the archetypes in 4-hexadecimal-digit terms. For example, if a card was "Elemental HERO" (0x3008), "Neos" (0x0009), and "Alien" (0x000C), then it could result in 0x30080009000C. (It does not matter the sequence of those archetypes after linking them together, so long as they are all present.)
Sub-archetypes
As explained above, the sub-archetype is denoted by the first of 4 hexadecimal digits. For example, the sub-archetype of 0x3184 is 3. If that digit would be a(n omitted) zero, then it does not belong to a sub-archetype.
However, something additional to note is that Card.IsSetCard performs a binary AND operation for the sub-archetype digit, instead of an equal comparison. Therefore, c:IsSetCard(0x3184) will return true for a 0x7184 card, BUT c:IsSetCard(0x7184) will return false for a 0x3184 card. (Whether an intentional outcome or not is up to you.) This is done with Saber, X-Saber, and XX-Saber (0xd, 0x100d, and 0x300d, respectively) to give you an official example.