35 The 2008 Regulation was in force at the date the Direction was issued and when the application for exemption was considered and determined, and remains in force. Clause 5(1) of the 2008 Regulation prescribes compliance with the 2007 Standard, unless cl23 applies. The applicant contends that cl23 applies to a swimming pool constructed before 1 September 2008; the respondent contends that it applies only where a swimming pool constructed before 1 September 2008 complied with the 1986 Standard as prescribed by cl 5 of the 1998 Regulation.
36 In Wilson v State Rail Authority of New South Wales [2010] NSWCA 198 the Court of Appeal considered the principles relevant to the construction of legislation. At paragraph [12], Allsop P (with whom Giles, Hodgson, Tobias and Macfarlan JJA agreed) held:
…However, as is now beyond dispute, in construing an Act, a court is permitted to have regard to the words used by Parliament in their legal and historical context. Context is to be considered in the first instance, not merely when some ambiguity is discerned. Context is to be understood in its widest sense to include such things as the existing state of the law and the mischief or object to which the statute was directed. These are legitimate means of understanding the purpose of the Act and of the relevant provisions, against which the terms and structure of the provisions and the Act, and a whole, are to be understood. Fundamental to the task, of course, is the giving of close attention to the text and structure of the Act, as the words used by Parliament to effect its legislative purpose. Nevertheless, general words, informed by an understanding of the context, and of the mischief to which the Act is directed, may be constrained in their effect. The foregoing principles can be taken from the following: Kingston v Keprose Pty Ltd (1987) 11 NSWLR 404 at 421-424, specifically approved by the Court (Mason CJ, Deane, Dawson, Toohey, Gaudron and McHugh JJ) in Bropho v Western Australia [1990] HCA 24; 171 CLR 1 at 20; CIC Insurance Ltd v Bankstown Football Club Ltd [1997] HCA 2; 187 CLR 384 at 408 (Brennan CJ, Dawson, Toohey and Gummow JJ); Newcastle City Council v GIO General Ltd [1997] HCA 53; 191 CLR 85 at 99 (Toohey, Gaudron and Gummow JJ), 112-113 (McHugh J); Project Blue Sky Inc v Australian Broadcasting Authority [1998] HCA 28; 194 CLR 355 at 381-382 [69]-[71] and 384 [78] (McHugh, Gummow, Kirby and Hayne JJ); Astley v Austrust Ltd [1999] HCA 6; 197 CLR 1 at 23 [49] (Gleeson CJ, McHugh, Gummow and Hayne JJ); Eastman v Director of Public Prosecutions of the Australian Capital Territory [2003] HCA 28; 214 CLR 318 at 322 [1] (Gleeson CJ agreeing with Heydon J) 330 [32] (Gummow J agreeing with Heydon J), 331 [34] (Kirby J agreeing with Heydon J), 331 [35] (Hayne J agreeing with Heydon J), 331 [36] (Callinan J agreeing with Heydon J) and 368 [140] and fn 99 (Heydon J); Network Ten Pty Ltd v TCN Channel Nine Pty Ltd [2004] HCA 14; 218 CLR 273 at 280-281 [10]-[11] (McHugh ACJ and Gummow and Hayne JJ), 305-306 (Kirby J, in dissent, though not in expression of principle); Minister for Immigration and Citizenship v SZJGV [2009] HCA 40 at [8]-[9] (French CJ and Bell J), [47]-[48] (Crennan and Kiefel JJ), cf [19]-[20] (Hayne J), though compare Alcan (NT) Alumina Pty Ltd v Commissioner of Territory Revenue [2009] HCA 41 and Saeed v Minister for Immigration and Citizenship [2010] HCA 23 at [33]-[34]; and see also the Interpretation Act 1987 (NSW), ss 33 and 34.
37 At paragraphs [13]-[14], Allsop P referred to the judgment of McHugh, Gummow, Kirby and Hayne JJ in Project Blue Sky Inc v Australian Broadcasting Authority (1998) 194 CLR 355 at 381-382 [69]-[71], and the judgment of Mason J in K & S Lake City Freighters Pty Ltd v Gordon & Gotch Ltd (1985) 157 CLR 309 at 315, to support the proposition that a legislative provision must be construed in context, using context in its widest sense.
38 Applying these principles to the interpretation of cl23 of the 2008 Regulation, the only express reference to a "complying" swimming pool is that contained in the heading. Subsection 35(2) of the Interpretation Act applies, so that this heading is taken not to be part of the Regulation. Subsection 35(5) provides:
(5) This section does not limit the application of section 34 in relation to the use of any heading, marginal note, footnote or endnote in the interpretation of the provision to which the heading, marginal note, footnote or endnote relates.
39 Section 34(1) of the Interpretation Act permits the consideration of any material not forming part of the Regulation that is capable of assisting in ascertainment of the meaning of a provision, in the following circumstances:
(a) to confirm that the meaning of the provision is the ordinary meaning conveyed by the text of the provision (taking into account its context in the Act or statutory rule and the purpose or object underlying the Act or statutory rule and, in the case of a statutory rule, the purpose or object underlying the Act under which the rule was made), or
(b) to determine the meaning of the provision:
(i) if the provision is ambiguous or obscure, or
(ii) if the ordinary meaning conveyed by the text of the provision (taking into account its context in the Act or statutory rule and the purpose or object underlying the Act or statutory rule and, in the case of a statutory rule, the purpose or object underlying the Act under which the rule was made) leads to a result that is manifestly absurd or is unreasonable.