# Filter Literal Values

The VisionPro Deep Learning filter grammar supports string and floating point value types. These literal values must be entered, as shown below:

Type | Example | Notes
--- | --- | ---
string |
    filename = 'RUN00031.bmp'
    sets ~ 'PlantA'
| Strings must be enclosed in single quotation marks, and escaping is not supported.
floating point |
    feature A feature is a visually distinguishable area in an image. Features typically represent something of interest for the application (a defect, an object, a particular component of an object). [score > 0.750]
    count(feature) = 10
| A decimal point is not required.