Create oslots.md

docs/features/oslots.md

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+# Feature: oslots
+
+Feature group | Feature type |  Data type | Available for node types
+---  | --- | --- | ---
+[`Grid`](featuresbygroup.md#grid-features) | [`Edge`](featuresbyfeaturetype.md#edge-features) | `String`  | All node types
+
+
+## Feature description 
+
+The set of slots associated with an object.
+
+Every object corresponds to exactly one *slot set*,
+i.e. the set of *word occurrences* that form the textual representation of that object.
+Every word fills a slot, and every slot has a unique sequence number.
+Earlier words have lower numbers than later words.
+An object does not have to be consecutive, it may be interrupted at any place.
+Different objects may or may not overlap.
+
+The slot set is given as a comma separated list of slot *ranges*, where a range has the form *n* `-` *m*,
+where *n* is a number smaller than or equal to *m*. The range *n* `-` *n* may be abbreviated to *n*.
+
+##### Note
+> The value of this feature for word objects is always just one number: the number of the slot the word occupies.
+All word occurrences are numbered from 1 to more than 400,000, in the order as they occur in the Greek New Testament.