#### 37.6.6 Using list variables in expressions

You might want to generate lists, such as lists by level of elements above the current element (its “ancestors”); see §37.4 Using multiple-value list variables.

In an expression, the following construct:

    ($$_paratag in $$mylist)

returns the value of the index for the current paragraph format in <$$mylist>, or 0 (zero) if missing; and:

    ($$mylist[$$level] is $$_paratag)

You can set the list item with a normal assignment:

    <$$mylist[$$level] = $$_paratag>

Previous Topic: 37.6.5 Specifying substrings in expressions

Next Topic: 37.6.7 Using indirection in expressions

Parent Topic: 37.6 Using expressions in macros

Sibling Topics:

37.6.1 Understanding macro expressions

37.6.2 Understanding operands and operators

37.6.3 Displaying expression results in output

37.6.4 Using control structures in expressions

37.6.5 Specifying substrings in expressions

37.6.7 Using indirection in expressions

37.6.8 Removing spaces from strings: an example

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