# Upgrading from 0.3.x

**URL:** <https://mworks.discourse.group/t/upgrading-from-0-3-x/56>\
**Category:** Installation\
**Created:** [March 8, 2013, 7:02pm UTC](https://mworks.discourse.group/t/upgrading-from-0-3-x/56 "2013-03-08T19:02:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [March 8, 2013, 7:02pm UTC](https://mworks.discourse.group/t/upgrading-from-0-3-x/56/1 "2013-03-08T19:02:17Z")

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If you have an experiment written for a 0.3.x version of MWorks, you’ll need to make some changes to the XML in order to run it under MWorks 0.4.x and later:

- I/O devices and I/O channels must have unique names
- I/O channels need to be defined as `<iochannel ...` instead of `<channel ...`
- The I/O channel attribute `type` must be renamed `data_type`
- I/O channels need to specify their data\_type attribute as underscore-separated words (e.g. `pulse_active_low` instead of `pulseActiveLow`)
- For the ITC-18, `triggered_analog_snippet` needs to have an additional attribute: `type="itc18_triggered_analog_snippet"`
- Selection objects that use `selection="sequential"` now must use `selection="sequential_ascending"`
- Selection variables need to be defined as `<variable type="selection" ...` instead of `<selection_variable ...`. The rest of the attributes are the same.
- A rectangle stimulus is defined as type `rectangle` instead of `rect`

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [July 20, 2022, 4:03pm UTC](https://mworks.discourse.group/t/upgrading-from-0-3-x/56/2 "2022-07-20T16:03:42Z")

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