[mapguide-users] expression builder problem (Tooltip)

[Jose Manuel C G]

I would like to know what kind of language is used in the Text Expression
Builder (Tooltip):

I try to build an expression like this(PHOTO = '001,002'):

My goal was show screenshot:001, screenshot:002... but it's impossible. Now
simply I want 'screenshot:001'

My expression is:
concat('screenshot: "', concat("PHOTO"'.substring(0,3)'))

But doesn't work...any idea?

Thks in advanced.
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