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<all> says that the elements within your content model may appear in any order.
<all> must be the only content model declaration that appears as a child of a <complexType> definition.
<all> cannot contain <sequence>, <choice>, or <group> declarations.
<all> declaration's children may appear once each in the instance document.
Within the <all>, the values for minOccurs/maxOccurs are limited to 0 or 1.
<all> is used when the expected content is known, but not the order.
Suppose you declared the <name> content model using the <all>:
<element name="name"
<complexType>
<all>
<element name="first" type="string"/
<element name="middle" type="string"/
<element name="last" type="string"/
</all>
<attribute name="title" type="string"/
</complexType>
</element>
The allowable content for a <name> element declared using an <all> declaration might include
<name>
<first>first</first>
<middle>middle</middle>
<last>last</last>
</name>
or
<name>
<first>first</first>
<last>last</last>
<middle>middle</middle>
</name>
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