1. Validation of `.xxe_gui` files
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## 1. Validation of `.xxe_gui` files

GUI specification files may be written using XMLmind XML Editor[4] or using a text editor.

If you use a text editor, do not forget to validate your GUI specification against its schema. After downloading and installing the add-on called "XMLmind XML Editor Configuration Pack" using Options → Install Add-ons, this schema is found in ``XXE_user_preferences_dir`/addon/xxe_config_pack/gui/xsd/gui.xsd`. Linux example:

    ~/.xxe4/addon$ /opt/xxe/bin/xmltool validate \
        -s ~/.xxe4/addon/xxe_config_pack/gui/xsd/gui.xsd tutorial7.xxe_gui

[4] You'll need to download and install the add-on called "XMLmind XML Editor Configuration Pack" in order to do that.

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