For the purposes of the present document, the terms and definitions given in 3G
TR 21.905 and the following apply:
informative elements:
those elements that provide additional information intended to assist the understanding or use of the 3GPP TS or 3GPP TR
instruction:
provision that conveys an action to be performed [ISO/IEC Guide 2:1996, definition 7.3]
normative element:
an element setting out provisions to which it is necessary to conform in order to be able to claim compliance with the Technical Specification
provision:
expression in the content of a normative document, that takes the form of a statement, an instruction, a recommendation or a requirement [ISO/IEC Guide 2:1996, definition 7.1]
recommendation:
provision that conveys advice or guidance [ISO/IEC Guide 2:1996, definition 7.4]
requirement:
provision that conveys criteria to be fulfilled [ISO/IEC Guide 2:1996, definition 7.5]
statement:
provision that conveys information [ISO/IEC Guide 2:1996, definition 7.2]
For the purposes of the present document, the abbreviations given in
TR 21.905 and the following apply:
ICS
Implementation Conformance Statement
PDF
Portable Document Format
SDL
Specification and Description Language
TR
Technical Report
TS
Technical Specification
TTCN-2
Tree and Tabular Combined Notation
TTCN-3
Testing and Test Control Notation