This attribute accepts "true" or "false".  AllowHtml="true" will allow a field to store encoded HTML.  That field on a data entry form will present with the content editing toolbar and the field can be edited in either source mode or WYSIWYG.

<Column Id="Body" Type="VarChar" Length="max" Rows="10" AllowHtml="true"/>

The example above creates an HTML encoded field 'Body'.
  • AllowHtml="true" allow the field to store HTML encoded content
  • Type="VarChar" sets the data type for the field to VarChar
  • Length="max" sets the allowed character limit of the field to maximum.
  • Rows="10" sets the field display to be ten rows high on data entry forms.