<entry key="y"><i>5</i></entry>
</dict> or: <dict>
<entry key="y"><i>5</i></entry> <entry key="x"><i>2</i></entry>
</dict> or: {/x 2 /y 5} or: {/y 5 /x 2}
or:
{
/x 2
/y 5
}
When a conventional order is fixed which indicates that key x is given before key y, the same dictionary can be written by: {2 5}

## 2.10 Tuples

Here, we consider a tuple as being a sequence of objects of the same type. For example, (2, 5, 8) is a tuple containing three integers.

## 2.10.1 Tagged Notation

A tuple is represented by a <tuple> element with all members of the tuple given in the body of the element. For example, the tuple (2, 5, 8) is represented by:
<tuple> <i>2</i> <i>5</i> <i>8</i> </tuple>

## 2.10.2 Abridged Notation

For the abridged variant, the members of any tuple are written directly within the enclosing tag. However, if we have two successive tuples (i.e. ... </tuple>
<tuple> ...), we use the character '|' as a separator between them. For example, the representation of a sequence of binary tuples takes the form (in BNF
notation):