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The metadata item. The metadata item value is numeric and can be:

•  simple (e.g. whole number)
• composite (eg 2.1 or 2.1.1)

A non-numerical character can be used to separate "-" the metadata numeric values e.g. 1__2-4. The separator can be any non-numeric character.

A suffix may be used after the last numeric element e.g. 2.1.1-BETA. This can be any set of characters (including letters, symbols, and numbers).

The increment expression, if specified, is a numeric expression to increment element(s) of the numeric value.

If no increment value is specified the last numeric element of the current metadata value is incremented by 1.

The expression can be:

• a simple integer number (e.g. 2)
• composite number (e.g. 1.2  or 1.2.3)

A composite number cannot be more than 3 numeric elements e.g. 1.2.3.4 is not supported.

When defining the increment expression the format MUST match the metadata item value format including any separators and suffix identifiers.

• increment or a change for non-numeric elements is not supported.
• incrementing a single higher-order element of a composite numeric value will reset any lower-order elements to zero e.g. a metadata value of 1.2.3 with an increment expression of 1.0.0 will update the value to 2.0.0.