How to modify XSD element from string to xml?

I have the following part in my XSD:

 <xs:element name="Parameter">
   <xs:complexType mixed="true">
     <xs:attribute name="Name" use="required" type="xs:stri开发者_运维知识库ng"/>
   </xs:complexType>
 </xs:element>

which means that value for a Parameter can be any string. Can I somehow specify that value for Parameter can be any valid xml like <aaa></aaa> ? Something like type="xs:xml"

Use <xs:any> to allow any XML elements in your content model.

<xs:element name="Parameter">
  <xs:complexType>
    <xs:sequence>
      <xs:any minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

You can restrict elements allowed by <xs:any> to certain namespaces with namespace attribute and control their validation with processContents attribute. To allow any attribute, use <xs:anyAttribute>

More info in the XML Schema recommendation: 3.10.2 XML Representation of Wildcard Schema Components

You will have to use

<xs:element name="Parameter" type="myType>

where

<complexType name="myType>
<choice>
<element "myXml" type="xml">
<element "myStr" type="xs:sting">
</choice>
</complexType>

and you will have to define xml like a pattern of xml you want to be your value.