# write vtkInformation

**URL:** https://discourse.vtk.org/t/write-vtkinformation/9915
**Category:** Support
**Tags:** python
**Created:** [November 21, 2022, 10:07pm UTC](https://discourse.vtk.org/t/write-vtkinformation/9915 "2022-11-21T22:07:14Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![hamid\_badi](https://discourse.vtk.org/user_avatar/discourse.vtk.org/hamid_badi/32/895_2.png) [@hamid\_badi](https://discourse.vtk.org/u/hamid_badi)
#### Post date: [November 21, 2022, 10:07pm UTC](https://discourse.vtk.org/t/write-vtkinformation/9915/1 "2022-11-21T22:07:14Z")

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Hello,

Is there a way to serialize extra keys from `vtkInformation` of an object ?  
I mean, i create an extra object key attached (instance of a class `MyInfoObj` which derived from `vtkObjectBase`) to a `vtkPolyData` object, I don’t know if it’s possible to write extra information tags (inn the xml) using the `vtkXMLPolyDataWriter` ? Do I need to override a specific method in my object class `MyInfoObj` to manage the extra xml writings ? Same for the desarialization using `vtkXMLPolyDataReader`.

Best regards.