With variables you define dynamic content inside of templates. When you render a video the actual content will come from parameters you set when you submit the render request. Variables can replace simple text, select or load a image or video resource, enable or disable a scene from being rendered or enable or disable an image or audio layer from being composited.
    You define variables inside of tag atributes in the form ${name, defaultValue, options}, whereas the defaultValue    will be taken if no parameter with name is supplied. If you do not want to supply a default value you can
    omit it. options are one letter codes that transform the value in one more ways:
    
| code | Description | 
|---|---|
| U | Uppercase | 
| L | Lowercase | 
| T | Title case | 
| E | URL Encode | 
| A | Arabic Glyph Shaping | 
| ${price} | Plain text variable named price | 
| ${city, 'New York'} | Text variable named city with default New York | 
| ${firstname,,U} | Variable named firstname with no default value that will be transformed to upper case | 
| ${searchquery,,EL} | Variable named searchquery with no default value that will be lower cased and URL encoded. | 
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