# Express Editor

- Open Express Editor
- Writing Express-schema

## Open Express Editor

You can open the express editor by:

- creating a new express file;

Or

- by opening an existing express file (with .exp extension), for example, by double-clicking on it in the Navigator panel.

However, if you open an express file using File -> Open File, the functionality of the Editor will be limited. That is because the file will be considered by Eclipse as an external file, not as an Eclipse resource. If your Express file is in an Express project, or in any other type of Eclipse project, or if you can import it into an Eclipse project first, better to open it as an Eclipse resource, by choosing it in the Navigator or other panel. But you still can edit and compile external project-less files with limited Editor functionality.
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## Writing Express-schema

After a new Express file is created or an existing file is opened, the Express Editor panel is activated on the Workbench (see Figure 1). A name of the file appears in the tab of the editor panel. If an asterisk (*) appears at the left side of the tab this indicates that the editor has unsaved changes. If an attempt is made to close the editor or exit the workbench with unsaved changes a prompt to save the editor's changes will appear.
The Express Editor provides basic functionality for Express files - Express syntax highlighting, error marking and navigation, when compiling the files with the Express Compiler. Error marking and navigation is not available for external express files, but they still can be compiled, and express errors are displayed on the Console panel.
Figure 1. Express Editor panel with highlighted errors
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