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The property list file format (.plist) is at the heart of many operations in Mac OS X. As a well-structured XML document, the .plist format is easy to parse programmatically. The format is important to understand, as Apple s preferences are currently stored in .plist files (however, Apple makes no guarantees of this format going forward). Not coincidentally, Managed Preferences are stored and delivered in a formatted .plist file, too. There are several tools available on Mac OS X that allow you to work with .plist files. These include Property List Editor.app and the plutil, defaults, and PlistBuddy command-line tools. Because .plist is the native format for Managed Preferences, it s essential for an administrator to understand the contents of a .plist file, and how to work with them. Therefore, we start this chapter with an overview of the .plist format, followed by an actual example that shows how Managed Preferences are stored and delivered in a .plist file. We then walk through the aforementioned tools that will help you deal with the .plist format.

let lookupName nm (dict : Dictionary<string,string>) = let mutable res = "" let foundIt = dict.TryGetValue(nm, &res) if foundIt then res else failwithf "Didn t find %s" nm At the time of this writing, the previous code gives a warning in F# since the use of the address-of operator & may lead to unverifiable or even invalid .NET code. The use of a reference cell can be cleaner. For example: > let res = ref "";; val res: string ref > capitals.TryGetValue("Australia", res);; val it: bool = false > capitals.TryGetValue("USA", res);; val it: bool = true > res;; val it: string ref = { contents = "Washington" } Finally, here is the technique where you simply don t pass the final parameter, and instead the result is returned as part of a tuple: > capitals.TryGetValue("Australia");; val it: bool * string = (false, null) > capitals.TryGetValue("USA");; val it: bool * string = (true, "Washington") Note the value returned in the second element of the tuple may be null if the lookup failed when this technique is used. null values are discussed in the section Working with null Values at the end of this chapter.

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You can use dictionaries with compound keys such as tuple keys of type (int * int). If necessary, you can specify the hash function used for these values when creating the instance of the dictionary. The default is to use generic hashing, also called structural hashing, a topic covered in more detail in 8. If you want to indicate this explicitly, you do so by specifying Microsoft.FSharp.Collections.HashIdentity.Structural when creating the collection instance. In some cases, this can also lead to performance improvements because the F# compiler often generates a hashing function appropriate for the compound type. Here is an example where we use a dictionary with a compound key type to represent sparse maps:

other. You ll need to experiment to determine whether Excel will be able to fill based on the proximity of multiple worksheet cells that you select.

> open System.Collections.Generic;; > open Microsoft.FSharp.Collections;; > let sparseMap = new Dictionary<(int * int), float>();; val sparseMap : Dictionary <string, string list> > sparseMap.[(0,2)] <- 4.0;; val it : unit = () > sparseMap.[(1021,1847)] <- 9.0;; val it : unit = () > sparseMap.Keys;; val it : Dictionary.KeyCollection<(int * int),float>

Simply put, property list files are well-formed ( structured ) XML files that store keys and values. Keys are like labels or variable names. .plist files store simple hierarchies of data. The types of data that can be stored in a .plist file are ostensibly limited to a few chosen types, but one type----binary data----can effectively store any binary value. The basic types that a .plist file can store are strings, numbers, binary data, dates, and Boolean values. There are also container types. A container isn t any type itself, but contains basic types or other containers. The container types are arrays and dictionaries.

= seq [(0,2); (1021; 1847) ]

To copy or fill values, select the worksheet cells into which you want to copy the values or fill a series of closely related values. Click Home (Editing) Fill (for Excel 2007) or click Edit Fill (for Excel 2003), and select one of the Fill submenu commands in order to specify a copy or fill method. Or drag the fill handle (the small box in the lowest right corner of the selected worksheet cells) to the worksheet cells for which you want to copy the selected values, and then release the mouse button; then click the Auto Fill Options button that appears, and specify a copy or fill method. You can use the Series dialog box (in Excel 2007, click Home (Editing) Fill Series; in Excel 2003, click Edit Fill Series) for greater control over the copy or fill method:

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