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<title>Adding a complex type</title>
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<h1 class="topictitle1">Adding complex types</h1>
<div><p>A complex type allows elements in its content and can carry attributes.
Complex types can be used to help determine the appropriate content for any
instance documents generated from or associated with your XML schema.</p>
<div class="section"><p>You can add as many complex types as you want to an XML schema.</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 complex type to an XML schema, follow these steps:</p>
</div>
<ol><li class="skipspace"><span>Open your XML schema in the XML schema editor.</span></li>
<li class="skipspace"><span>In the Outline view, select your schema.</span></li>
<li class="skipspace"><span>In the Graph view, right click in the <b>Types</b> section and
click <b> <span class="uicontrol">Add Complex Type</span></b>.</span></li>
<li class="skipspace"><span>In the Properties view, type a new name for the complex type in
the <b> <span class="uicontrol">Name</span></b> field.</span></li>
<li class="skipspace"><span>Click the <b> <span class="uicontrol">More</span></b> button 
<img border="0" src="../images/More.gif" width="22" height="18"> to select a base type
for your complex type.</span> You can either set a base type for your
complex type, or you add a content model to it (which represents any data
that may be contained inside an element), but you cannot do both. For more
information about content models, refer to the related tasks.</li>
<li class="stepexpand"><span>Select <span class="uicontrol">restriction</span> or <span class="uicontrol">extension</span> from
the <span class="uicontrol">Derived by</span> list.</span> This specifies whether
your type is derived from its base type by restriction or extension.</li>
<li class="skipspace"><span>Click the <b> <span class="uicontrol">Other</span></b> tab.</span> The following
optional values can be specified in this page:<ol type="a"><li class="skipspace"><span>Select the appropriate value in the 
	<b> <span class="uicontrol">abstract</span></b> list.</span> When a complex type is declared abstract, it cannot be used in an instance
document. Click <b>true</b> if you want the complex type to be abstract; otherwise,
click <b>false</b>.</li>
<li class="skipspace"><span>Select the appropriate value in the <b> <span class="uicontrol">block</span></b> list.</span> If you select <b>#all</b>, the complex type may not be replaced by any
derivations. If you select <b>extension</b>, the complex type may not be replaced
by any type derived from it by extending it. If you select <b>restriction</b>,
the complex type may not be replaced by any type derived from it by restricting
it.</li>
<li class="skipspace"><span> Select the appropriate value in the <b> <span class="uicontrol">final</span></b> list.</span> If you select <b>#all</b>, the complex type may not be derived from
at all. If you select <b>extension</b>, the complex type may not be derived
from by extension. If you select <b>restriction</b>, the complex type may
not be derived from by restriction.</li>
<li class="skipspace"><span>Select the appropriate value in the <b> <span class="uicontrol">mixed</span></b> list.</span> If you click <b>true</b>, the complex type can contain mixed content
(both character data and other elements). If you click <b>false</b>, the complex
type can only contain other elements.</li>
</ol>
</li>
<li class="skipspace"><span>Click the <b> <span class="uicontrol">Attributes</span></b> tab.</span> You
can use this page to add attributes, attribute references, attributes group
references, and <samp class="codeph">any</samp> attributes to your complex type.</li>
<li class="skipspace"><span>An attribute associates an attribute name with a specific type
and value. To add an attribute, right-click in the Attributes page, and click <b> <span class="uicontrol">Add
Attribute</span></b>.</span> You can specify the following values for
an attribute<ul><li><b><span class="uicontrol">fixed/default</span></b>. Click the 
	<b> <span class="uicontrol">More</span></b> button <span>
	<img border="0" src="../images/More.gif" width="22" height="18"></span> 
and select the <b> <span class="uicontrol">Fixed</span></b> or <b> <span class="uicontrol">Default</span></b> radio
button and specify an appropriate value. If you select <b>Fixed</b>, the attribute
has a fixed value, which cannot be changed. If you select <b>Default</b>,
the attribute has a default value. When an attribute has a default value,
the value of the attribute is whatever value appears as the attribute's value
in an instance document.</li>
<li><b><span class="uicontrol">form</span></b>. Use this field to indicate if the appearance
of this attribute in an instance of the XML schema must be qualified by a
namespace.</li>
<li><span class="uicontrol"><b>name</b>. </span>Enter the name of the attribute.</li>
<li><span class="uicontrol"><b>type</b>. </span>Click the <b> <span class="uicontrol">More</span></b> button <span>
<img border="0" src="../images/More.gif" width="22" height="18"></span> 
and select the type of the attribute. </li>
<li><span class="uicontrol"><b>use</b>. </span>This field indicates how an attribute may
be used in an instance document. If you select <b>optional</b>, the attribute
may appear once, but it does not have to. If you select <b>required</b>, the
attribute must appear once. If you select <b>prohibited</b>, the attribute
must not appear. <b>Note</b>: If you selected the <b> <span class="uicontrol">Default</span></b> radio
button, you must select <b>optional</b> in this field, otherwise the default
value will not be valid.</li>
</ul>
</li>
<li class="skipspace"><span>An attribute reference provides a reference to a global attribute.
To add an attribute reference, right-click in the Attributes page, and click <b> <span class="uicontrol">Add
Attribute Ref</span>.</b> </span>A declaration that references a global
attribute enables the referenced attribute to appear in the instance document
in the context of the referencing declaration. The menu option to add
an attribute reference only appears if there are global attributes defined
elsewhere in the document.<ol type="a"><li><span>Select the reference, then select the global attribute you want
it to reference from the <b> <span class="uicontrol">ref</span></b> drop down list.</span></li>
</ol>
</li>
<li class="skipspace"><span>An attribute group reference provides a reference to an attribute
group. To add an attribute group reference, right-click in the Attributes
page, and click <b> <span class="uicontrol">Add Attribute Group Ref. </span></b></span> &nbsp;A
declaration that references an attribute group enables the referenced attribute
group to appear in the instance document in the context of the referencing
declaration. The menu option to add an attribute group reference only appears
if there are attribute groups defined elsewhere in the document.<ol type="a"><li><span>Select the reference, then select the attribute group you want
it to reference from the<span class="uicontrol"> <b>ref</b></span> drop down list.</span></li>
</ol>
</li>
<li class="skipspace"><span>An <samp class="codeph">any</samp> element enables element content according
to namespaces, and the corresponding <samp class="codeph">any</samp> attribute 
element enables attributes to appear in elements. To add an <samp class="codeph">any</samp> attribute,
right-click in the Attributes page, and click <b> <span class="uicontrol">Add Any Attribute</span></b>.</span> You can specify the following values for an <samp class="codeph">any</samp> attribute:<ul><li>For a <b>namespace</b> value, you can select <b>##any</b> (this allows
any well-formed XML from any namespace), <b>##local </b> (this allows any
well-formed XML that is not declared to be in a namespace, <b>##other </b> (this
allows any well-formed XML that is not from the target namespace of the type
being defined) or <b>##targetNamespace </b> (which is shorthand for the target
namespace of the type being defined). </li>
<li>For a <b> <span class="uicontrol">processContents</span></b> value, you can select <b>skip</b> (the
XML processor will not validate the attribute content at all), <b>lax </b>(the
XML processor will validate the attribute content as much as it can), or <b>strict </b> (the
XML processor will validate all the attribute content).</li>
</ul>
 </li>
<li class="skipspace"><span>Click the <b> <span class="uicontrol">Documentation</span></b> tab if you want
to provide any information about this complex type.</span> The <span class="uicontrol">Documentation</span> page
is used for human readable material, such as a description, and the <span class="uicontrol">App
Info</span> page can be used to provide information for applications.</li>
</ol>
</div>

<div><p><b class="reltaskshd">Related tasks</b><br />
<a href="../topics/taddcmod.html" title="You can add a content model to an element, global element, a complex type, or a group. A content model is the representation of any data that may be contained inside the element, global element, complex type, or group.">Adding a content model</a><br />
</p>
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