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


 <div><p>Simple types are used to create derived data types. 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> list, 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> list,
 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>To set specific constraint values on your simple type,
 such as length constraints, enumerations, and patterns, click the <span class="uicontrol">Constraints</span> tab.</span>
 <ol type="a">
 <li class="substepexpand"><span>You can use <em>enumerations</em> 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 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>You can use <em>patterns</em> 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>

 <li class="stepexpand"><span>If you do not want the simple type to be used to derive
 other types, click the <span class="uicontrol">Advanced</span> tab and, in
 the <span class="uicontrol">Final</span> list, select if derivations should
 be prevented by <span class="uicontrol">list</span>, <span class="uicontrol">restriction</span>, <span class="uicontrol">union</span> or <span class="uicontrol">#all</span>.</span></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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	<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
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	<meta content="task" name="DC.Type" />
	<meta name="DC.Title" content="Adding simple types" />
	<meta name="abstract" content="Simple types are used to create derived data types. 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." />
	<meta name="description" content="Simple types are used to create derived data types. 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." />
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	<title>Adding simple types</title>
	</head>
	<body id="taddsmpt"><a name="taddsmpt"><!-- --></a>


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




	<div><p>Simple types are used to create derived data types. 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> list, 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> list,
	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>To set specific constraint values on your simple type,
	such as length constraints, enumerations, and patterns, click the <span class="uicontrol">Constraints</span> tab.</span>
	<ol type="a">
	<li class="substepexpand"><span>You can use <em>enumerations</em> 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 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>You can use <em>patterns</em> 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>

	<li class="stepexpand"><span>If you do not want the simple type to be used to derive
	other types, click the <span class="uicontrol">Advanced</span> tab and, in
	the <span class="uicontrol">Final</span> list, select if derivations should
	be prevented by <span class="uicontrol">list</span>, <span class="uicontrol">restriction</span>, <span class="uicontrol">union</span> or <span class="uicontrol">#all</span>.</span></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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