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 <h1 class="topictitle1">Adding simple types</h1>


 <div><p>Simple types are used to create derived datatypes. They provide
 a set of constraints on the value space (a set of values) and the lexical
 space (a set of valid literals) of a datatype.</p>

 <div class="section"><p>A simple type cannot have element content and cannot carry attributes.
 Elements that contain numbers (and strings, and dates, and so on) but do not
 contain any sub-elements have a simple type.</p>
 <p>The following instructions
 were written for the Resource perspective, but they will also work in many
 other perspectives.</p>
 <p>To add a simple type, complete the following steps:</p>
 </div>

 <ol>
 <li class="stepexpand"><span>Open your XML schema in the XML schema editor.</span></li>

 <li class="stepexpand"><span>In the Outline view, right-click <strong>Types</strong>, and click <span class="uicontrol">Add
 Simple Type</span>.</span></li>

 <li class="stepexpand"><span>In the Outline view, select the new simple type.</span></li>

 <li class="stepexpand"><span>In the Properties view, click the <span class="uicontrol">General</span> tab.</span>
 </li>

 <li class="stepexpand"><span>Type a new name for the simple type in the <span class="uicontrol">Name</span> field.</span>
 </li>

 <li class="stepexpand"><span>You can select the following options from the <span class="uicontrol">Variety</span> list:</span>
 <ul>
 <li><span class="uicontrol">atomic</span>: atomic types are all the
 simple types built into the XML schema language.</li>

 <li><span class="uicontrol">list</span>: list types are comprised of sequences
 of atomic types. They have values that are comprised of finite-length sequences
 of atomic values. </li>

 <li><span class="uicontrol">union</span>: union types enable an element or attribute
 value to be one or more instances of one type drawn from the union of multiple
 atomic and list types.</li>

 </ul>

 </li>

 <li class="stepexpand"><span>If you selected <span class="uicontrol">atomic</span> or <span class="uicontrol">list</span> from
 the <span class="uicontrol">Variety</span> drop-down, click <span class="uicontrol">Browse</span> <img src="../images/Browse.gif" alt="This graphic is the Browse button" /> next
 to the <span class="uicontrol">Base type</span> or <span class="uicontrol">Item type</span> field
 to specify a base type for the simple type.</span> The Set Type dialog
 box lists all built-in and user-defined types currently available. You can
 change the <span class="uicontrol">Scope</span> of the list by selecting one of the
 following options:<ul>
 <li><span class="uicontrol">Workspace</span>: lists all of the types available in
 your workspace. </li>

 <li><span class="uicontrol">Enclosing Project</span>: lists all of the types available
 in the project that contains your file. </li>

 <li>(Default) <span class="uicontrol">Current Resource</span>: lists all of the types
 available in your current file.</li>

 <li><span class="uicontrol">Working Sets</span>: lists all the types available within
 the selected working set.</li>

 </ul>
 </li>

 <li class="stepexpand"><span>If you selected <span class="uicontrol">union</span> from the <span class="uicontrol">Variety</span> drop-down,
 click <span class="uicontrol">Browse</span> <img src="../images/Browse.gif" alt="This&#10;graphic is the Browse button" /> next to the <span class="uicontrol">Member types</span> field
 to specify the member types for the simple type.</span> You can select
 to add both <span class="uicontrol">Built-in simple types</span> and <span class="uicontrol">User-defined
 simple types</span> to the member types value list. </li>

 <li class="stepexpand"><span>Click the <span class="uicontrol">Constraints</span> tab.</span> From
 here you will be able to set specific constraint values including length constraints,
 enumerations, and patterns.
 <ol type="a">
 <li class="substepexpand"><span>Enumerations help you to define a set of valid values for simple
 types. They are the actual values the simple type can take as valid values
 in the instance document. You can either add one enumeration or several enumerations
 at a time:</span> <ul>
 <li>To add one enumeration at a time, under <span class="uicontrol">Specific constraint
 values</span>, select <span class="uicontrol">Enumerations</span> and click <span class="uicontrol">Add</span> and
 specify a value for the enumeration.</li>

 <li>To add several enumerations at one time:<ol type="i">
 <li>Select <span class="uicontrol">Enumerations</span> and click <span class="uicontrol">Add</span>.</li>

 <li>Enter the value of each enumeration. Each value must be separated by the <span class="uicontrol">Delimiter
 character</span>. For example: <samp class="codeph">First, Second</samp> will create
 two enumerations, one with the value "First" and one with the value "Second".</li>

 <li>Select the <span class="uicontrol">Preserve leading and trailing whitespace</span> check
 box if you want any white space around your enumeration values to be preserved.
 If you select this check box, the values of <samp class="codeph">First, Second</samp> will
 show up as "First" and " Second" (there is a space before Second) because
 you put a space before "Second" when entering the value.</li>

 <li>Click <span class="uicontrol">OK</span>. Your enumerations will be created and
 appear in the Properties view.</li>

 </ol>
 </li>

 </ul>
 </li>

 <li class="substepexpand"><span>Patterns help you to place certain constraints regarding allowable
 values.</span> For example, you could restrict the field to only accept
 input which follows the pattern "five digits followed by two upper-case ASCII
 letters". To set a pattern constraint:<ol type="i">
 <li>Select <span class="uicontrol">Patterns</span> and click <span class="uicontrol">Add</span>.</li>

 <li>Create the regular expression pattern you wish to use as your constraint
 using the <span class="uicontrol">Regular Expression</span> wizard.</li>

 <li>Click <span class="uicontrol">Finish</span>.</li>

 </ol>
 </li>

 </ol>

 </li>

 <li class="stepexpand"><span>Click the <span class="uicontrol">Documentation</span> tab if you want
 to provide any information about this simple type.</span> The <span class="uicontrol">Documentation</span> page
 is used for human readable material, such as a description.</li>

 <li class="stepexpand"><span>Click the <span class="uicontrol">Extensions</span> tab if you want to
 add application information elements to your annotations of schema components.</span>
  The <span class="uicontrol">Extensions</span> page allows you to specify the
 schema and add XML content to your annotations.</li>

 </ol>

 </div>

 <div><div class="reltasks"><strong>Related tasks</strong><br />
 <div><a href="../topics/taddreg.html" title="A pattern facet can be used to constrain the value of a type's lexical space (the set of string literals that represent the values of a type), which indirectly constrains the value space.">Adding pattern facets to simple types</a></div>
 </div>
 </div>

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	<body id="taddsmpt"><a name="taddsmpt"><!-- --></a>


	<h1 class="topictitle1">Adding simple types</h1>




	<div><p>Simple types are used to create derived datatypes. They provide
	a set of constraints on the value space (a set of values) and the lexical
	space (a set of valid literals) of a datatype.</p>

	<div class="section"><p>A simple type cannot have element content and cannot carry attributes.
	Elements that contain numbers (and strings, and dates, and so on) but do not
	contain any sub-elements have a simple type.</p>
	<p>The following instructions
	were written for the Resource perspective, but they will also work in many
	other perspectives.</p>
	<p>To add a simple type, complete the following steps:</p>
	</div>

	<ol>
	<li class="stepexpand"><span>Open your XML schema in the XML schema editor.</span></li>

	<li class="stepexpand"><span>In the Outline view, right-click <strong>Types</strong>, and click <span class="uicontrol">Add
	Simple Type</span>.</span></li>

	<li class="stepexpand"><span>In the Outline view, select the new simple type.</span></li>

	<li class="stepexpand"><span>In the Properties view, click the <span class="uicontrol">General</span> tab.</span>
	</li>

	<li class="stepexpand"><span>Type a new name for the simple type in the <span class="uicontrol">Name</span> field.</span>
	</li>

	<li class="stepexpand"><span>You can select the following options from the <span class="uicontrol">Variety</span> list:</span>
	<ul>
	<li><span class="uicontrol">atomic</span>: atomic types are all the
	simple types built into the XML schema language.</li>

	<li><span class="uicontrol">list</span>: list types are comprised of sequences
	of atomic types. They have values that are comprised of finite-length sequences
	of atomic values. </li>

	<li><span class="uicontrol">union</span>: union types enable an element or attribute
	value to be one or more instances of one type drawn from the union of multiple
	atomic and list types.</li>

	</ul>

	</li>

	<li class="stepexpand"><span>If you selected <span class="uicontrol">atomic</span> or <span class="uicontrol">list</span> from
	the <span class="uicontrol">Variety</span> drop-down, click <span class="uicontrol">Browse</span> <img src="../images/Browse.gif" alt="This graphic is the Browse button" /> next
	to the <span class="uicontrol">Base type</span> or <span class="uicontrol">Item type</span> field
	to specify a base type for the simple type.</span> The Set Type dialog
	box lists all built-in and user-defined types currently available. You can
	change the <span class="uicontrol">Scope</span> of the list by selecting one of the
	following options:<ul>
	<li><span class="uicontrol">Workspace</span>: lists all of the types available in
	your workspace. </li>

	<li><span class="uicontrol">Enclosing Project</span>: lists all of the types available
	in the project that contains your file. </li>

	<li>(Default) <span class="uicontrol">Current Resource</span>: lists all of the types
	available in your current file.</li>

	<li><span class="uicontrol">Working Sets</span>: lists all the types available within
	the selected working set.</li>

	</ul>
	</li>

	<li class="stepexpand"><span>If you selected <span class="uicontrol">union</span> from the <span class="uicontrol">Variety</span> drop-down,
	click <span class="uicontrol">Browse</span> <img src="../images/Browse.gif" alt="This graphic is the Browse button" /> next to the <span class="uicontrol">Member types</span> field
	to specify the member types for the simple type.</span> You can select
	to add both <span class="uicontrol">Built-in simple types</span> and <span class="uicontrol">User-defined
	simple types</span> to the member types value list. </li>

	<li class="stepexpand"><span>Click the <span class="uicontrol">Constraints</span> tab.</span> From
	here you will be able to set specific constraint values including length constraints,
	enumerations, and patterns.
	<ol type="a">
	<li class="substepexpand"><span>Enumerations help you to define a set of valid values for simple
	types. They are the actual values the simple type can take as valid values
	in the instance document. You can either add one enumeration or several enumerations
	at a time:</span> <ul>
	<li>To add one enumeration at a time, under <span class="uicontrol">Specific constraint
	values</span>, select <span class="uicontrol">Enumerations</span> and click <span class="uicontrol">Add</span> and
	specify a value for the enumeration.</li>

	<li>To add several enumerations at one time:<ol type="i">
	<li>Select <span class="uicontrol">Enumerations</span> and click <span class="uicontrol">Add</span>.</li>

	<li>Enter the value of each enumeration. Each value must be separated by the <span class="uicontrol">Delimiter
	character</span>. For example: <samp class="codeph">First, Second</samp> will create
	two enumerations, one with the value "First" and one with the value "Second".</li>

	<li>Select the <span class="uicontrol">Preserve leading and trailing whitespace</span> check
	box if you want any white space around your enumeration values to be preserved.
	If you select this check box, the values of <samp class="codeph">First, Second</samp> will
	show up as "First" and " Second" (there is a space before Second) because
	you put a space before "Second" when entering the value.</li>

	<li>Click <span class="uicontrol">OK</span>. Your enumerations will be created and
	appear in the Properties view.</li>

	</ol>
	</li>

	</ul>
	</li>

	<li class="substepexpand"><span>Patterns help you to place certain constraints regarding allowable
	values.</span> For example, you could restrict the field to only accept
	input which follows the pattern "five digits followed by two upper-case ASCII
	letters". To set a pattern constraint:<ol type="i">
	<li>Select <span class="uicontrol">Patterns</span> and click <span class="uicontrol">Add</span>.</li>

	<li>Create the regular expression pattern you wish to use as your constraint
	using the <span class="uicontrol">Regular Expression</span> wizard.</li>

	<li>Click <span class="uicontrol">Finish</span>.</li>

	</ol>
	</li>

	</ol>

	</li>

	<li class="stepexpand"><span>Click the <span class="uicontrol">Documentation</span> tab if you want
	to provide any information about this simple type.</span> The <span class="uicontrol">Documentation</span> page
	is used for human readable material, such as a description.</li>

	<li class="stepexpand"><span>Click the <span class="uicontrol">Extensions</span> tab if you want to
	add application information elements to your annotations of schema components.</span>
	The <span class="uicontrol">Extensions</span> page allows you to specify the
	schema and add XML content to your annotations.</li>

	</ol>

	</div>

	<div><div class="reltasks"><strong>Related tasks</strong><br />
	<div><a href="../topics/taddreg.html" title="A pattern facet can be used to constrain the value of a type's lexical space (the set of string literals that represent the values of a type), which indirectly constrains the value space.">Adding pattern facets to simple types</a></div>
	</div>
	</div>

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