# Source Page

The Source Page in the Target Definition Editor is used to edit the target definition directly through its source code. All of the changes made on other pages of the Editor are reflected here. Edits made to the source code are reflected on the other pages of the editor as well.

Editing is made easier with completion assist suggestions for tags, unit ids and versions, and environment variables along with error diagnostics for solving syntax, formatting, and improper value errors.

Ensuring the use of the newest IU versions is made easier with the "Update IU versions from repo" command found in the right-click context menu. This command will update the version tag value of all units within the target definition file

### Related references

Target Definition Editor
Definition Page (Target Definition Editor)
Content Page (Target Definition Editor)
Environment Page (Target Definition Editor)
Edit Target Wizard

### Related concepts

Target Definitions