---
title: "Focus"
slug: "focus-syntax"
updated: 2022-07-27T22:26:35Z
published: 2022-07-27T22:26:35Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://code.tag.bio/llms.txt
> Use this file to discover all available pages before exploring further.

# focus

## focus
**usage: *common* - datatype: *object*** 
<br>
The *focus* for a Tag.script is the intersection of the *background* attribute and the set of entities defined by the *focus* attribute. The *focus* attribute is mandatory when the analysis method is "tag-comparison". There is no default value for the *focus* attribute, therefore an error will be thrown if it is undefined for a "tag-comparison" analysis. The simple form of the *focus* attribute is a single categorical variable object.
<br>

```
"focus": {
  "variable_type": "categorical", //A categorical variable object
  "collection": "cccc", //"cccc" is a valid categorical collection name in tag.cortex
  "variable": "vvvv" //"vvvv" is a valid variable name in collection "cccc"
}
```
<br>
Alternatively, the *focus* attribute can be any categorical variable object that compiles to a single categorical variable, e.g. "categorical-compound".
<br>

```
"focus": {
  "variable_type": "categorical-compound",
  "operator": "oooo", //"AND" for intersection, "OR" for union
  "criteria": [
    {...}, //Two or more categorical variable objects
    {...},
    ...   
  ]
}
```