String literals are written as “Hello” or ‘Hello’. In each case the opposite kind of quotation mark can be used within the string: ‘He said “Hello” ’ or “London is a big city”. To feed PsychoPath, “ ‘Hello World!’ ”or “ “Hello World!” ” can be used to feed it with strings. Remember that the ResultSequence returns AnyType so since a string is being expected as the result, first it has to be casted in the code like this: String xsstring = (String)(rs.firstValue()); Numeric constants follow the Java rules for decimal literals: for example, 4 or 4.67; a negative number can be written as -3.05. The numeric literal is taken as a double precision floating point number if it uses scientific notation (e.g. 1.0e7), as a fixed point decimal if it includes a decimal point, or as an integer otherwise. When extracting number literals from the ResultSequence, possible types to be returned include BigDecima''l (e.g. : xs:decimal: 4.67),''Int ''(e.g. : xs:integer: 4) or ''XSDouble (e.g. : xs:double 1e0). All of which need to be casted in the same manner as stated before: from AnyType to their corresponding types.

There are no boolean constants as such: true, false instead the function calls true() and false() are used.

Constants of other data types can be written using constructors. These look like function calls but require a string literal as their argument. For example, xs:float(“10.7”) produces a single-precision floating point number.