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Because the DTD is a machine-readable document, it is part of your finished system, enforcing the rules set forth in it and assisting different application components in dealing with your XML instances For example, an application environment might use a DTD to create object classes based on the elements in its DTD Any text editor or word processor can be used to edit XML documents, but structured XML editors use the DTD to enforce compliance at the input level, restricting authors from using invalid XML codes Likewise, your application can "validate" individual XML instances against the DTD to ensure that they conform This is especially important when you're accepting XML from external sources (such as other businesses) or when your XML is being authored in one system and delivered through another system (as often happens in the realm of content management) In these types of situations, you'll want to validate your XML against the DTD before processing it further Note In XML-land, an instance is a word for a self-contained bit of XML that is well formed, that is, it conforms to XML's syntax rules (such as the tag nesting structure) and therefore is legal XML An instance is usually the same as a document, although this isn't always the case For example, a single text file document might be made up of many XML instances (you might concatenate several XML instances together into a single file to transfer the file between systems) Readers familiar with object-oriented terminology

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describe User do before(:each) do @attr = { :name => "Example User", :email => "user@examplecom" } end

it "should require an email address" do no_email_user = Usernew(@attrmerge(:email => "")) no_email_usershould_not be_valid end end

All time zone ids are uppercase letters and are three characters in length You can also view a list of all supported time zones using slush s date command supplying the -t option

class User < ActiveRecord::Base attr_accessible :name, :email validates :name, :presence => true validates :email, :presence => true end

All of the public classes, built-in or otherwise, in the hierarchy are listed in almanac form in the appendix

should find nothing odd about the use of the term instance for an XML document Essentially, a DTD is a class, and an XML document is an instance of that class

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We ve constrained our User model to require a name for each user, but we should go further: the user s names will be displayed on the sample site, so we should enforce some limit on their length With all the work we did in Section 621, this step is easy We start with a test There s no science to picking a maximum length; we ll just pull 50 out of thin air as a reasonable upper bound, which means verifying that names of 51 characters are too long (Listing 614)

The memory footprint of TINI s Java Virtual Machine (JVM) is less than 40 kilobytes Despite its small size, it supports much of the functionality provided by full JVM implementations, including the following Full support for threads Support for all primitive types Strings

describe User do before(:each) do @attr = { :name => "Example User", :email => "user@examplecom" } end it "should reject names that are too long" do

long_name = "a" * 51 long_name_user = Usernew(@attrmerge(:name => long_name)) long_name_usershould_not be_valid end end

However, there are also important omissions such as these Dynamic class loading Object nalization5

In 4, you braved the waters of abstract data modeling, so now it's time to get concrete Building your XML DTD is the next step in data-oriented application design The first question you must ask, while looking at your abstract data model diagram from 4 (see Figure 4-7) is "Where doesn't XML fit " Identify the parts of your data model that make more sense as purely relational entities Such parts usually are supporting data, such as key words and author names For example, in CyberCinema there's no reason to list valid reviewers in an XML file The reviewers and details about them (for example, names and e-mail addresses) can be stored in a relational table The reviews themselves are best stored as XML

For convenience, we ve used string multiplication in Listing 614 to make a string 51 characters long We can see how this works using the console:

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