 pattern.
For example, "%{#family}" expands to the number of family names
<TT
CLASS="PARAMETER"
><I
>pattern</I
></TT
> has set, which may be zero.&#13;</P
><P
>&#13;A <I
CLASS="FIRSTTERM"
>sub-expression</I
> tag
is one that expands a sub-expression.  The tag contents
are the sub-expression to expand placed inside another set of curly braces.
Sub-expression tags are useful for aligning an entire sub-expression, or to
apply converters (explained later) to the entire sub-expression output.
For example, the f