ANSI/NISO Z39.102-2017

8 ANSI/NISO Z39.102-2017 STS (Version 1.0) • 8.2 Attributes

8.2.73 @level Hierarchical Level

Used on elements that can name a nested hierarchy (for example, <comm-ref-group> or complementary or introductory titles) to indicate the level of nesting. Such groups start at 1, with embedded groups taking higher numbers.

In elements <comm-ref-group>, <compl>, <compl-title-wrap>, <intro>, and <intro-title-wrap>, this attribute may be used if the element is used.
Value Meaning
Text, numbers, or special characters. The level of this element in the hierarchy, typically a counting number such as 2.