When exporting fields to XML, you may specify the TYPE in the 'Field Definitions' dialogue.
Select Field Definitions... from the 'Edit' menu then choose one of these options from the drop-down Type list:
Option
TYPE attribute
Any content
ANY
Alphabetic
ALPH
Alphanumeric
ALNUM
Numeric
NUM
Decimal
DEC
Currency
CUR
DateDMY
DMY
DateMDY
MDY
DateYMD
YMD
Phone
TEL
Email
EML
URL
URL
Graphic
GRA
XML note:
When the TYPE is set to Graphic, you may choose to output the field as an image in PNG format: see Outputting to XML.