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# NIX Features and Changes
This document outlines the features that have been implemented in NIX and have not yet been added to NIXPy.
The features are separated into two sections: Released features and Unreleased ones. The latter is for features that exist in nix/master but have yet to be included in a stable release.
# Released
## Data compression
NIX PR: [#695](https://github.com/G-Node/nix/pull/695)
NIXPy Issue: [#277](https://github.com/G-Node/nixpy/issues/277)
Introduced in [NIX Version 1.4.1](https://github.com/G-Node/nix/releases/tag/1.4.1)
Description: Exposes HD5's dataset compression support through the NIX DataArray creation API.
Note: NIXPy can currently load files with compressed datasets and writing to an existing compressed dataset should work without issues, since H5Py supports this. However, there is no way to create a compressed dataset through NIXPy since the options aren't exposed anywhere in the NIXPy API.
# Unreleased
## DataFrame
NIX PR: [#708](https://github.com/G-Node/nix/pull/708)
Description: A new object type called DataFrame for tabular data.
## Retrieve multiple tagged data slices in one go
NIX PR: [#722](https://github.com/G-Node/nix/pull/722)
Description: Retrieve multiple tagged slices with one call to the retrieveData function. This can save a considerable amount overhead that would occur if multiple calls were made.
NIXPy Issue: [#285](https://github.com/G-Node/nixpy/issues/285)
## Remove Values and move Uncertainty to Property
NIX PR: [#723](https://github.com/G-Node/nix/pull/723)
NIXPy Issue: [#301](https://github.com/G-Node/nixpy/issue/301)
Description: Metadata Values are no longer a compound data type. The Property object is now a dataset with a simple data type.
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