Value indicating the particular syntax denoted by this annotation.
Different tools will recognize different syntaxes, but some
proposed canonical values are:
- "Java"
- "RegEx"
- "JavaScript"
- "Ruby"
- "Groovy"
- "SQL"
- "FormatString"
Syntax names can be followed by a colon and a list of key value pairs, separated by commas.
For example, "SQL:dialect=Oracle,version=2.3". Tools should ignore any keys they don't
recognize.