 Notations In this document, various notations such as changes of font are used for clarity. Within the text, a bold font is used to indicate keywords, and the same font is used in italic to indicate technical terms. An italic font is used to indicate a reference to a technical term defined elsewhere or a word in a syntax diagram that names a segment of syntax. Similarly, in the syntax diagrams in this document, words (symbols) in a bold font also denote keywords or sub-keywords, and words (such as expression) in italics denote a token or collection of tokens defined elsewhere. The brackets [ and ] delimit optional (and possibly alternative) parts of the instructions, whereas the braces { and } indicate that one of a number of alternatives must be selected. An ellipsis (...) following a bracket indicates that the bracketed part of the clause may optionally be repeated. Occasionally in syntax diagrams (for indexed references) brackets are 'real' (that is, a bracket is required in the syntax; it is not marking an optional part). These brackets are enclosed in single quotes. Note that the keywords and sub-keywords in the syntax diagrams are not case-sensitive: the symbols 'IF' 'If' and 'iF' would all match the keyword shown in a syntax diagram as if. Note also that most of the clause delimiters (';') shown may usually be omitted as they will be implied by the end of a line. | 
