# ArgumentSyntax class

Namespace: [Grasshopper2.Parsing](https://developer.rhino3d.com/api/gh2/namespace/grasshopper2.parsing.md) · Assembly: [Grasshopper2](https://developer.rhino3d.com/api/gh2/assembly/grasshopper2.md)

```cs
public sealed class ArgumentSyntax
```

Represents a syntactic description for a class of mutually exclusive arguments in parsing notation.

## Properties

- [Description](https://developer.rhino3d.com/api/gh2/type/grasshopper2.parsing.argumentsyntax/description.md): Gets the argument category description.
- [MustExist](https://developer.rhino3d.com/api/gh2/type/grasshopper2.parsing.argumentsyntax/mustexist.md): Gets whether this argument class is required or optional.

## Methods

- [Optional](https://developer.rhino3d.com/api/gh2/type/grasshopper2.parsing.argumentsyntax/optional.md): (static)
- [Required](https://developer.rhino3d.com/api/gh2/type/grasshopper2.parsing.argumentsyntax/required.md): (static)