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userName

Calls getUserName() or setUserName, depending on context

user.address.city

Calls getUser().getAddress().getCity() or getUser().getAddress().setCity(), depending on context

user?.name

Calls getUser() and, if the result is not null, calls getName() on the result

groupList.size()

calls getGroupList().size()

members.findById(user.id)?.name

Calls getMembers().findById(getUser().getId()).getName() (unless findById returns null)

1..10

Iterates between integers 1 and 10

1..myList.size()

Iterates between 1 and the result of getMyList().size()

'Beer is proof that God loves us and wants us to be happy.'

Use single quotes

[user.name, user.email, user.phone]

! user.deleted

the boolean negation of getUser().getDeleted()

! user.middleName

true only if getUser.getMiddleName() returns null or an empty string

{ 'framework' : 'Tapestry', 'version' : version }

Keys are string literals (in single quotes), but could be properties as well