Simple Words

Examples:

Hello
User-Name

Where a series of characters cannot be parsed as a decimal number, they are interpreted as a simple string composed of one word. These words are interpreted as static strings and are usually equivalent to placing the string in single quotes. When they are used in the left-hand side of a conditional expression they can be interpreted as a reference to an attribute.

This syntax is allowed for simplicity, as there are many cases where simple text can be used, and it would be awkward to require the simple text to be quoted.