Transcription: We're starting to see our content model take shape. We're defining the parent-child relationships between elements and the occurrence of those elements and whether they're required, whether they're optional, and the ordinal position that they need to appear. But what we haven't done yet is we haven't defined the types of data that some of these elements contain. Now this is similar to defining a column type in a product like Microsoft Access in the relational model, for example, but not quite. Let's take a look at how this works.
(.mp4)