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<sub-part-number> Document Sub-part Number

The <part-number> gives the part number of the document, for individual parts of multipart documents. For some standards organizations, the part- number granularity is insufficient, and the <part-number> can be used to hold sub-part numbers, for sections and similar components of parts.
Attributes
content-type

Base Attributes

id
xml:base
Models and Context
May be contained in
<std-ident>
Description
Text, numbers, or special characters, zero or more
Expanded Content Model

(#PCDATA)*

Tagged Sample

A part divided into numbered sections

...
<std-ident>
  <originator>IEC</originator>
  <doc-type>is</doc-type>
  <doc-number>60034</doc-number>
  <part-number>18</part-number>
  <sub-part-number content-type="section">41</sub-part-number>
...
</std-ident>...