---
title: isXIDStart
framework: swift
role: symbol
role_heading: Instance Property
path: swift/unicode/scalar/properties-swift.struct/isxidstart
---

# isXIDStart

A Boolean value indicating whether the scalar is one which is recommended to be allowed to appear in a starting position in a programming language identifier, with adjustments made for NFKC normalized form.

## Declaration

```swift
var isXIDStart: Bool { get }
```

## Discussion

Discussion The set of scalars [:XID_Start:] closes the set [:ID_Start:] under NFKC normalization by removing any scalars whose normalized form is not of the form [:ID_Start:] [:ID_Continue:]*. This property corresponds to the “XID_Start” property in the Unicode Standard.