Does ODK 2.0 have do / while / for loop syntax?

[hpardess]

Here i have uploaded the screenshot of my form screen:

[ODK2] Repeat questions

as you mentioned, we can design household member as sub-form for each member but in that case each sub-form can not be linked and depended on each another. For example, If mother is 25 years old and we filled one sub-form entry. For her son we will fill next sub-form but when they enter age of son as 20 there should be error saying the age difference between mother and son is 5 years which is very less. Please correct your entry. I have customized and designed HTML page which look like followi…