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1. Modify metainfo.xml to define a theme by including a themes block.

   <themes-dir>themes-dir</themes-dir>
   <themes>
     <theme>
       <fileName>theme.json</fileName>
       <default>true</default>
     </theme>
   </themes>

2. The optional <themes-dir> element can be used if the default theme folder of 'themes' is not desired, or taken by another service in the same metainfo.xml.

3. Multiple themes can be defined, however only the first default theme will be used for the service.

4. Each theme points to a theme JSON file (via fileName element) in the themes-dir folder.

5. The theme.json file contains one configuration block containing three main keys

1. layouts - specify tabs, sections and sub-section layout

2. placement - specify configurations to place in sub-sections

3. widgets - specify which UI widgets to use for each config

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