other

optional

<element name="element-name">
  <optional>
    <attribute name="object1">
      <text/>
    </attribute>
  </optional>
</element>
					

The element/attribute pattern does not need to be defined.

mixed

<element name="element-name">
  <mixed>
    <zeroOrMore>
      <element name="object1">
        <text/>
      </element>
    </zeroOrMore>
  </mixed>
</element>
					

The pattern can contains both elements and text nodes.