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To include this optional field as part of the default XML for a new form, leave the box checked. To exclude it, clear the check box. All of the non-optional elements have a grayed-out check box, meaning you cannot clear the check box.
Defining XML Attributes An Attribute can appear 0 or 1 times within a given element in the XML document. Attributes are either optional or mandatory (by default they are optional). The "use" property in the XSD definition is used to specify if the attribute is optional or mandatory.
The maxOccurs attribute specifies the maximum number of times that the element can occur. It can have a value of any positive integer greater than or equal to the value of the minOccurs attribute.
Try this
<xs:element name="description" type="xs:string" minOccurs="0" maxOccurs="1" />
if you want 0 or 1 "description" elements, Or
<xs:element name="description" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
if you want 0 to infinity number of "description" elements.
Set the minOccurs attribute to 0 in the schema like so:
<?xml version="1.0"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
<xs:element name="request">
<xs:complexType>
<xs:sequence>
<xs:element name="amenity">
<xs:complexType>
<xs:sequence>
<xs:element name="description" type="xs:string" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element> </xs:schema>
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