---
title: generationMarker
framework: ContactProvider
role: symbol
role_heading: Instance Property
platforms: [iOS 18.0+, iPadOS 18.0+]
path: contactprovider/contactitempage/generationmarker
---

# generationMarker

A value specific to your data source identifying the database generation when enumeration of content started.

## Declaration

```swift
var generationMarker: Data
```

## Discussion

Discussion When a content enumeration is underway, you must use the same generationMarker until the enumeration completes. If you restart content enumeration, you can use a new generationMarker value from that point onward.

## See Also

### Supporting paging

- [offset](contactprovider/contactitempage/offset.md)
- [initialPage](contactprovider/contactitempage/initialpage.md)