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Local definitions

Instead of writing all element declarations and type definitions at top-level (globally), they may be inlined (locally):

Example: 

<element name="card" type="b:card_type"/>
<element name="name" type="string"/>

<complexType name="card_type">
  <sequence>
    <element ref="b:name"/>
    <element ref="b:title"/>
    <element ref="b:email" maxOccurs="unbounded"/>
    <element ref="b:phone" minOccurs="0"/>
    <element ref="b:background" minOccurs="0"/>
  </sequence>
</complexType>

means the same as 

<element name="card">
  <complexType>
    <sequence>
      <element name="name" type="string"/>
      <element ref="b:title"/>
      <element ref="b:email" maxOccurs="unbounded"/>
      <element ref="b:phone" minOccurs="0"/>
      <element ref="b:background" minOccurs="0"/>
    </sequence>
  </complexType>
</element>

(where the complex type card_type and the description of name have been inlined)

except that:

- otherwise, it is mostly a matter of authoring style.

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