The Schema of a Simple Text

The simplest Index records in the system have schema trees with just one node - a content node. Specifically, they have a JaggedArrayNode, which is a type of content node.

For the JaggedArrayNode there's a corresponding JaggedArray on the Version (not included in the diagram) containing the text.

Example: The Book of Genesis

An example of a simple schema is the book of Genesis. The text for Genesis is stored in a depth 2 JaggedArray - an array of elements of elements. Each outer element represents a chapter, and each element within that element is an array of strings, which are verses.

The content for this book looks like this:

[
  ["Verse 1:1", "Verse 1:2", ...] # Chapter 1
  ["Verse 2:1", "Verse 2:2", ...] # Chapter 2
  [...] 
]

The Index schema describing the book looks like this.

{
    "title" : "Genesis",
    "maps" : [],
    "order" : [1, 1],
    "categories" : ["Tanach", "Torah"],
    "schema" : {
        "titles" : [ 
            {
                "lang" : "en",
                "text" : "Genesis",
                "primary" : True
            }, 
            {
                "lang" : "en",
                "text" : "Bereishit"
            }, 
            {
                "lang" : "he",
                "text" : "בראשית",
                "primary" : True
            }
        ],
        "nodeType" : "JaggedArrayNode",
        "lengths" : [50, 1533],
        "depth" : 2,
        "sectionNames" : ["Chapter", "Verse"],
        "addressTypes" : ["Integer", "Integer"],
        "key" : "Genesis"
    }
}

Let's dive into the various properties on the schema:

Property	Value in `Genesis`	Explanation
`key`	`Genesis`	A text field. For a single node schema like this, the value of `key` is the same as the value of the `title"`field on the Index record.
`nodeType`	`JaggedArrayNode`	This corresponds to a related class in the Python code. The value, `JaggedArrayNode`, is currently the only one that is always used for single-node classes.
`titles`	`[ { "lang" : "en", "text" : "Genesis", "primary" : True }, { "lang" : "en", "text" : "Breishit" }, { "lang" : "he", "text" : "בראשית", "primary" :True } ]`	An array of dictionaries specifying titles for this node (for full description of how titles work, see Titles. Each title dictionary has two required keys: - `text` : The title string - `lang`: Either `"en"` or `"he"` - `primary`: This field needs to be present and `True` for exactly one Hebrew and one English title.
`depth`	`2`	The depth of the `JaggedArray`. A two dimensional array (i.e. a list of lists) would have a depth of 2, and a three dimensional array (i.e. a list of lists of lists) would have a depth of 3, etc.
`addressTypes`	`["Integer", "Integer"]`	Array with `depth` number of values, each one indicating how that level of the `JaggedArray` is addressed. Most commonly, these values are `Integer`, but could also be `Talmud`, or some less common values defined in `safaria.model.schema`
`sectionNames`	`["Chapter","Verse"]`	Array with `depth` number of values, each one a string name for that level of the `JaggedArray`.
`toc_zoom`	n/a	An Integer value primarily used to adjust the way we choose to organize commentaries around the base text (and therefore not present on the `Index` of `Genesis`). Usually, a commentary is organized by the segments of commentary on the verse of the base text it comments on. Adjusting the `toc_zoom` will allow you to display the commentary on a verse-by-verse basis (section), or a chapter-by-chapter basis (super-section), or based on a different level in the index depth. `toc_zoom` sets the depth for display in the table of contents according to the following values: `0` will display segments (each string in the Jagged Array). `1` will display sections. `2` will display super-sections. If not set, the table of contents will display the section level (or segment level for depth 1 texts). An example of a commentary `Index` with an adjusted `toc_zoom` can be found here, where comments are aggregated by verse of the base text for display (sections), instead of individual comments (segments).
`lengths` (optional)	`[50, 1533]`	Array with up to `depth` number of values, each one an integer specifying how many element exist at that level of the `JaggedArray`. In this case, we see that `Genesis` has `50` chapters, and `1533` verses.