LongStringSettings represents the tools that are available for a specific editor.
When you add an xhtml string to a page type you can disable any of the editor tools (like bold, link tool, view html...). That field stores those settings.
EPiServer Development Team
I'm getting an error exporting pagetypes and dynamic properties in admin mode after migrating from EPiServer 4 to EPiServer CMS 5 R2 SP2.
Exception: There was an error generating the XML document.[Instance validation error: '268435455' is not a valid value for EPiServer.Editor.EditorToolOption.]
There's supposedly a fix for this error updating the number 268435455 to a lower number in the EPiServer database table tblPageDefinition and the field LongStringSettings. However I need to know what this number or other numbers in LongStringSettings actually mean (what function they have) before running the update in production. Does anyone know?