[xsde-users] Serializer/Parser with anyType

[Boris Kolpackov]

Hi Khuong,

Khuong Nguyen Thi Lien <ntlkhuong at tma.com.vn> writes:

> 1. How to serialize the element "ok" as the below schema fragment:
> 
>       <xs:complexType name="rpcReplyType">
> 		<xs:choice>
> 			<xs:element name="ok"/>
> 			<xs:group ref="rpcResponse"/>
> 		</xs:choice>
> 		<xs:attribute name="message-id" type="messageIdType" use="optional"/>
> 		<xs:anyAttribute processContents="lax"/>
> 	</xs:complexType>

Element 'ok' is (implicitly) of type xsd:anyType which is a special
type that can contain any attributes/elements/text in any order.
To serialize an element of this type you will need to implement
the xml_schema::any_type_sskel serializer skeleton, for example:


struct ok_any_type_simpl: xml_schema::any_type_sskel
{
  virtual void
  _serialize_attributes ()
  {
     ...
  }

  virtual void
  _serialize_content ()
  {
     ...
  }
};

Inside the _serialize_attributes() and _serialize_content()
functions you would normally call the low-level XML serialization
function as described in Section 5.4, "Element Wildcard Callbacks"
in the Embedded C++/Serializer Mapping Getting Started Guide:

http://www.codesynthesis.com/projects/xsde/documentation/cxx/serializer/guide/#5.4

In case all you need is an empty 'ok' element, then you can simply use
the default xml_schema::any_type_simpl provided by the XSD/e runtime.


> 2. How to parse the element "select" as the below schema fragment:
> 
> 	<xs:complexType name="filterInlineType">
> 		<xs:complexContent>
> 			<xs:extension base="xs:anyType">
> 				<xs:attribute name="type" type="FilterType" default="subtree"/>
> 				<xs:attribute name="select"/>
> 			</xs:extension>
> 			<!-- if type="xpath", the xpath expression
>            appears in the select element -->
> 		</xs:complexContent>
> 	</xs:complexType>

Similarly to the previous case, attribute 'select' is (implicitly) of
type xsd:anySimpleType which is a special type that can contain any
text. To parse an element of this type you will need to implement
the xml_schema::any_simple_type_pskel parser skeleton, for example:

struct select_any_simple_type_pimpl: xml_schema::any_simple_type_pskel
{
  virtual void
  _any_characters (const xml_schema::ro_string& s)
  {
    // s contains raw character data
  }
};

Boris