string

as is

date

XML Schema format
For example:
2006-07-14T00:00:00.000+02:00
(time component will be ignored)

datetime

XML Schema format
For example:
2006-07-18T22:23:00.000+02:00
Note that maximum precision for time component supported by Daisy is seconds.

long

sequence of digits, without separators

double

sequence of digits, use dot as decimal separator

decimal

same as double

boolean

true or false

link

daisy:<docid>@<branch>:<lang>
<branch> and <lang> are optional (means: same as containing document, this is recommended as the links will automatically adjust when copying data between branches and languages)
<docid> is in the form <sequence number>-<namespace>
Examples:
daisy:123-DSY
daisy:123-DSY@main:default
daisy:123-DSY@:default (specifies only language, not branch)