The delivered SmartPlant schema contains many objects and relationships. However, you may need to add new objects and relationships to meet the needs of your company.
To modify or extend the SmartPlant schema, you can use the Schema Editor.
Even though you can edit any .xml file in a text editor like Notepad, we recommend
that you use the Schema Editor for all SmartPlant schema modifications. If you do
view the SmartPlant schema in a text editor, be sure that you do not modify the schema
version number. If the schema version number in the .xml file is different from the
version of the delivered schema instructions file, schema upgrade may have errors
or may fail.