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<task id="taddsmpt" xml:lang="en-us">
<title>Adding simple types</title>
<searchtitle>Adding simple types</searchtitle>
<shortdesc>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.</shortdesc>
<keywords><indexterm>XML schema editor<indexterm>simple types</indexterm></indexterm>
<indexterm>XML schema files<indexterm>simple types</indexterm></indexterm>
<context><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></context>
<step><cmd>Open your XML schema in the XML schema editor.</cmd></step>
<step><cmd>In the Outline view, right-click <b>Types</b>, and click <uicontrol>Add
Simple Type</uicontrol>.</cmd></step>
<step><cmd>In the Outline view, select the new simple type.</cmd></step>
<step><cmd>In the Properties view, click the <uicontrol>General</uicontrol> tab.</cmd>
<step><cmd>Type a new name for the simple type in the <uicontrol>Name</uicontrol> field.</cmd>
<step><cmd>You can select the following options from the <uicontrol>Variety</uicontrol> list:</cmd>
<choice><uicontrol>atomic</uicontrol>: atomic types are<?Pub Caret?> all the
simple types built into the XML schema language.</choice>
<choice><uicontrol>list</uicontrol>: list types are comprised of sequences
of atomic types. They have values that are comprised of finite-length sequences
of atomic values. </choice>
<choice><uicontrol>union</uicontrol>: 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.</choice>
<step><cmd>If you selected <uicontrol>atomic</uicontrol> or <uicontrol>list</uicontrol> from
the <uicontrol>Variety</uicontrol> drop-down, click <uicontrol>Browse</uicontrol> <image
href="../images/Browse.gif"><alt>This graphic is the Browse button</alt></image> next
to the <uicontrol>Base type</uicontrol> or <uicontrol>Item type</uicontrol> field
to specify a base type for the simple type.</cmd><info>The Set Type dialog
box lists all built-in and user-defined types currently available. You can
change the <uicontrol>Scope</uicontrol> of the list by selecting one of the
following options:<ul>
<li><uicontrol>Workspace</uicontrol>: lists all of the types available in
your workspace. </li>
<li><uicontrol>Enclosing Project</uicontrol>: lists all of the types available
in the project that contains your file. </li>
<li>(Default) <uicontrol>Current Resource</uicontrol>: lists all of the types
available in your current file.</li>
<li><uicontrol>Working Sets</uicontrol>: lists all the types available within
the selected working set.</li>
<step><cmd>If you selected <uicontrol>union</uicontrol> from the <uicontrol>Variety</uicontrol> drop-down,
click <uicontrol>Browse</uicontrol> <image href="../images/Browse.gif"><alt>This
graphic is the Browse button</alt></image> next to the <uicontrol>Member types</uicontrol> field
to specify the member types for the simple type.</cmd><info>You can select
to add both <uicontrol>Built-in simple types</uicontrol> and <uicontrol>User-defined
simple types</uicontrol> to the member types value list. </info></step>
<step><cmd>Click the <uicontrol>Constraints</uicontrol> tab.</cmd><info>From
here you will be able to set specific constraint values including length constraints,
enumerations, and patterns. </info>
<substep><cmd>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:</cmd><info><ul>
<li>To add one enumeration at a time, under <uicontrol>Specific constraint
values</uicontrol>, select <uicontrol>Enumerations</uicontrol> and click <uicontrol>Add</uicontrol> and
specify a value for the enumeration.</li>
<li>To add several enumerations at one time:<ol>
<li>Select <uicontrol>Enumerations</uicontrol> and click <uicontrol>Add</uicontrol>.</li>
<li>Enter the value of each enumeration. Each value must be separated by the <uicontrol>Delimiter
character</uicontrol>. For example: <codeph>First, Second</codeph> will create
two enumerations, one with the value "First" and one with the value "Second".</li>
<li>Select the <uicontrol>Preserve leading and trailing whitespace</uicontrol> check
box if you want any white space around your enumeration values to be preserved.
If you select this check box, the values of <codeph>First, Second</codeph> 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 <uicontrol>OK</uicontrol>. Your enumerations will be created and
appear in the Properties view.</li>
<substep><cmd>Patterns help you to place certain constraints regarding allowable
values.</cmd><info>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>
<li>Select <uicontrol>Patterns</uicontrol> and click <uicontrol>Add</uicontrol>.</li>
<li>Create the regular expression pattern you wish to use as your constraint
using the <uicontrol>Regular Expression</uicontrol> wizard.</li>
<li>Click <uicontrol>Finish</uicontrol>.</li>
<step><cmd>Click the <uicontrol>Documentation</uicontrol> tab if you want
to provide any information about this simple type.</cmd><info>The <uicontrol>Documentation</uicontrol> page
is used for human readable material, such as a description.</info></step>
<step><cmd>Click the <uicontrol>Extensions</uicontrol> tab if you want to
add application information elements to your annotations of schema components.</cmd>
<info>The <uicontrol>Extensions</uicontrol> page allows you to specify the
schema and add XML content to your annotations.</info></step>
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