There may be any number of Requirements sections and phrases in a section but all must be satisfied.
Requirement sections and phrases may be identified following 'shall' or 'must' in normative text
Requirement sections and phrases may be identified following, 'is defined as' in definitive text.
Requirement sections and phrases may be identified following just 'is' in descriptive text
Requirements sections are the most common
Example
Normative: Every blue except light blue rectangular door or window excluding shop-fronts unless in London or temporary and removed daily shall be fireproof and soundproof unless a roof-light .
