CONTENTS

�1���� Objectives and scope
�2���� Terminology
�3���� Maintenance of ITU-T Rec. Z.120
�4���� Z.120 changes
������� 4.1���� Clerical error � Reference to Section 0: Section 1.2
������� 4.2���� Clarification � References to non-existent productions in Meta-language examples: Section 1.3
������� 4.3���� Clerical error � Spelling of "precedence": Section 1.3
������� 4.4���� Clerical error � Missing closing double quote in text: Section 1.3
������� 4.5���� Clarification � Generic production names: Section 1.4
������� 4.6���� Clarification � Correct example production: Section 1.4
������� 4.7���� Clerical error � Reference to non-existent <event list>: Section 4.1
������� 4.8���� Clarification � Removal of reference to instance interface with environment: Section 4.1
������� 4.9���� Clarification � Relationship between timed and untimed semantics: Section 6
������ 4.10���� Modification � Lexical rules: Section 2.1
������ 4.11���� Modification � Removal of keywords: Section 2.1
������ 4.12���� Modification � Replacement of keywords "startbefore", "startafter", "endbefore", "endafter": Section 2.1
������ 4.13���� Clerical error � Typo corrected: Section 2.1
������ 4.14���� Clarification � Role of <space> explained: Section 2.1
������ 4.15���� Clarification and Modification � Production for <non par non escape>: Section 2.1
������ 4.16���� Modification � Moving data part in MSC document: Section 3
������ 4.17���� Clarification � Environment messages in redefined MSCs: Section 3
������ 4.18����Modification � Move <time interval> reference in <time dest list>: Section 4.1
������ 4.19���� Modification � Allowing parameter blocks in any order: Section 4.1
������ 4.20���� Modification and clarification � Removal of SDL <kind denominator> keywords: Sections 4.1, 4.2, and 2.1
������ 4.21���� Clarification � Replacing <textual msc document> by "MSC document": Section 4.1
������ 4.22���� Modification � Addition <label names> to <time dest>, and change of keywords: Section 4.1
������ 4.23���� Clarification � Defining when static instances come into existence: Section 4.2
������ 4.24���� Clerical error � Typo: Section 4.2
������ 4.25���� Clarification � Creating and terminating instances inside MSC reference: Section 4.2
������ 4.26���� Clerical error � Missing Static Requirements title: Section 4.2
������ 4.27���� Clerical error � Spelling of AccessPoint in Figure 28: Section 4.2
������ 4.28���� Clerical error � Reference to non-existent productions: Section 4.3
������ 4.29���� Clerical error � Reference to a non-existent production: Section 4.4
������ 4.30���� Clerical error � Spelling mistakes: Section 4.5
������ 4.31���� Clerical error � Figures 23, 24, 25, and 26: Section 8.1
������ 4.32���� Clerical error � Spelling mistake: Section 4.7
������ 4.33���� Clarification � Instances covered by a condition: Section 4.7
������ 4.34���� Clarification � Type of timer duration expressions: Section 4.8
������ 4.35���� Clerical error � Hyphens in syntax rules changed to spaces: Section 5.2
������ 4.36���� Modification � Addition of delimiters in <escapechar>: Section 5.2
������ 4.37���� Clarification � Change of the word "delimiter": Section 5.2
������ 4.38���� Modification � Removal of comma in <par decl list>: Section 5.2
������ 4.39���� Modification � Grammar for parenthesis declarations: Section 5.2
������ 4.40���� Clarification and clerical Error � Grammar for parenthesis declarations: Section 5.2
������ 4.41���� Modification � Changing terminator ';' to separator ';': Section 7.3
������ 4.42���� Modification � Optional variables keyword in <data parameter decl>: Section 5.5
������ 4.43���� Modification � Addition of default time unit: Section 6.4
������ 4.44���� Clerical error � Incorrect time marks: Section 6.9
������ 4.45���� Clerical error � Typo: Section 6.10
������ 4.46���� Clerical error � Incorrect references to productions: Section 6.10
������ 4.47���� Clerical error � Typo, "what" corrected to "which": Section 6.10
������ 4.48���� Modification � Keyword int_boundary made optional: Section 6.10
����� �4.49���� Clarification � Sense of mirroring symbols: Section 6.10
������ 4.50���� Modification � Addition of absolute time intervals: Section 6.10
������ 4.51���� Modification � Addition of sequence for in-line expressions: Section 7.2
������ 4.52���� Modification � Replacement of time constraint keywords and addition of time statement in <shared inline expr>: Section 7.2.
������ 4.53���� Modification � Replacement of time constraint keywords and addition of time statement in <inline expr>: Section 7.2.
� �����4.54���� Clarification � Explanation of time constraints on in-line expressions: Section 7.2
������ 4.55���� Modification � Replacement of time constraint keywords and moving of time statement in <shared msc reference>: Section 7.3.
������ 4.56���� Modification � Addition of a time constraint statement and moving the time statement in <msc reference>: Section 7.3.
������ 4.57���� Clarification � Change of time constraint keywords: Section 7.3
������ 4.58���� Clerical error � Missing reference to 'seq': Section 7.3
������ 4.59���� Clerical error � Incorrect reference to production: Section 7.3
������ 4.60���� Modification � Allowing actual parameter blocks in any order: Section 7.3
������ 4.61���� Clerical error � Incorrect instance declarations, Figures 12 & 16: Section 7.4
������ 4.62���� Modification � Addition of time constraint statements in HMSC reference and parallel nodes: Section 7.5.
������ 4.63���� Clerical error � Incorrect reference to production: Section 7.5
������ 4.64���� Clerical error � Grammar correction: Section 11
������ 4.65���� Clerical error � Removal of time units from Figures 43, 44 and 46: Section 11
������ 4.66���� Clerical error � Case of msc keyword in Figures 42 to 46: Section 11
������ 4.67���� Clerical error � Revealing missing text in Figure 42: Section 11
������ 4.68���� Clerical error � Incorrect reference to <keywords>: Annex A
������ 4.69���� Open item � Production <end> vs. semicolon in textual grammar