Encoding Style Of The Serialized Xml
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Renders data to HTML, using Django's standard template rendering.Unlike other renderers, the data passed to the Response does not need to be serialized. Also, unlike other renderers, you may want to include a template_name argument when creating the Response.
Note that if a renderer class returns a unicode string, then the response content will be coerced into a bytestring by the Response class, with the charset attribute set on the renderer used to determine the encoding.
In some cases you might want your view to use different serialization styles depending on the accepted media type. If you need to do this you can access request.accepted_renderer to determine the negotiated renderer that will be used for the response.
XLSX is the world's most popular binary spreadsheet format. Tim Allen of The Wharton School maintains drf-excel, which renders an endpoint as an XLSX spreadsheet using OpenPyXL, and allows the client to download it. Spreadsheets can be styled on a per-view basis.
Django REST Pandas provides a serializer and renderers that support additional data processing and output via the Pandas DataFrame API. Django REST Pandas includes renderers for Pandas-style CSV files, Excel workbooks (both .xls and .xlsx), and a number of other formats. It is maintained by S. Andrew Sheppard as part of the wq Project.
JSON exchange in an open ecosystem must be encoded in UTF-8. The encoding supports the full Unicode character set, including those characters outside the Basic Multilingual Plane (U+10000 to U+10FFFF). However, if escaped, those characters must be written using UTF-16 surrogate pairs. For example, to include the Emoji character U+1F610 ? NEUTRAL FACE in JSON:
Early versions of JSON (such as specified by RFC 4627) required that a valid JSON text must consist of only an object or an array type, which could contain other types within them. This restriction was dropped in RFC 7158, where a JSON text was redefined as any serialized value.
Numbers in JSON are agnostic with regard to their representation within programming languages. While this allows for numbers of arbitrary precision to be serialized, it may lead to portability issues. For example, since no differentiation is made between integer and floating-point values, some implementations may treat 42, 42.0, and 4.2E+1 as the same number, while others may not. The JSON standard makes no requirements regarding implementation details such as overflow, underflow, loss of precision, rounding, or signed zeros, but it does recommend expecting no more than IEEE 754 binary64 precision for "good interoperability". There is no inherent precision loss in serializing a machine-level binary representation of a floating-point number (like binary64) into a human-readable decimal representation (like numbers in JSON), and back, since there exist published algorithms to do this exactly and optimally.
Serialization is handled by System.Runtime.Serialization namespace. To serialize an object, you need to create two things, stream to contain the serialized objects and a formatter to serialize the objects into the stream.
The above code targets UTF-8 as the encoding for the objects when serialized to XML (eXtensible Markup Language).In order to specify UTF-8 encoding, the Encoding property of the StringWriter had to be overridden.
The encoding rules employed in a particular SOAP message are specified by theencodingStyle attribute, as discussed above. There is no notion of default encoding in aSOAP message. Encoding style must be explicitly specified if the receiving application isexpected to validate the message.
SOAP does not define an independent data type system. Rather, it relies on the XML Schematype system. It adopts all XML Schema built-in primitive types and adds few extensions forcompound types. The SOAP version 1.2 types extending the XML Schema types are defined in aseparate namespace, namely -encoding.
This identifier is used as a general-case encoding style for messages that don't fit into any of the previous cases. The arguments are encoded into the envelope's Body tag without any sort of context sensitivity.
If no parameter is given, returns the current version of SOAP that is being used as the basis for serializing messages. If a parameter is given, attempts to set that as the version of SOAP being used. The value should be either 1.1 or 1.2. When the SOAP version is being set, the package selects new URNs for envelope and encoding spaces and also calls the xmlschema method to set the appropriate schema definition.
The encoding subroutine must return an array containing three elements: 1) the name of the XML element, 2) a hash containing the attributes to be placed into the element, and 3) the value of the element.
When the type of an element has not been declared explicitly, SOAP::Lite must "guess" at the object's type. That is due to the fact that the only form of introspection that Perl provides (through the use of the ref subroutine) does not provide enough information to SOAP::Serializer to allow SOAP::Lite to determine the exact type of an element being serialized.
When SOAP::Serializer is asked to encode an object into XML, it goes through the following steps. First, SOAP::Serializer checks to see if a type has been explicitly stated for the current object. If a type has been provided SOAP::Serializer checks to see if an as_TypeName subroutine as been defined for that type. If such a subroutine exists, then SOAP::Serializer passes the object to it to be encoded. If the subroutine does not exist, or the type has not been provided, then SOAP::Serializer must attempt to "guess" the type of the object being serialized.
To do so, SOAP::Serializer runs in sequence a set of tests stored in the SOAP::Serializer::typelookup hash. SOAP::Serializer continues to run each test until one of the tests returns true, indicating that the type of the object has been detected. When the type of the object has been detected, then SOAP::Serializer passes the object to the encoding subroutine that corresponds with the test that was passed. If all the tests fail, and the type was not determined, then SOAP::Serializer will as a last resort encode the object based on one of the four basic data types known to Perl: REF, SCALAR, ARRAY and HASH.
The encoding subroutine will have passed to it by SOAP::Serializer four parameters: the value to be encoded, the name of the element being encoded, the assumed type of the element being encoded, and a reference to a hash containing the attributes of the element being encoded. The encoding subroutine must return an array representing the encoded datatype. SOAP::Serializer will use the contents of this array to generate the corresponding XML of the value being encoded, or serialized. This array contains the following 3 elements: the name of the XML element, a hash containing the attributes to be placed into the element, and the value of the element.
To register the new data type, simply add the type to the SOAP::Serializer::typelookup hash using the type name as the key, and an array containing the precedence value, the test subroutine, and the encoding subroutine.
An encoding attribute is introduced to give you control over the serialization of parts of multipart request bodies. This attribute is only applicable to multipart and application/x-www-form-urlencoded request bodies.
As you can see in the picture above, an array is used as an intermediary betweenobjects and serialized contents. This way, encoders will only deal with turningspecific formats into arrays and vice versa. The same way, Normalizerswill deal with turning specific objects into arrays and vice versa.
The check is only done if the AbstractObjectNormalizer::ENABLE_MAX_DEPTH key of the serializer contextis set to true. In the following example, the third level is not serializedbecause it is deeper than the configured maximum depth of 2:
The discriminator is the field (in the serialized string) used to differentiatebetween the possible objects. In practice, when using the Serializer component,pass a ClassDiscriminatorResolverInterfaceimplementation to the ObjectNormalizer.
Once the serialized data is transmitted from the source machine to the destination machine, the reverse process of creating objects from the byte sequence called deserialization is carried out. Reconstructed objects are clones of the original object.
Computer data is generally organized in data structures such as arrays, tables, trees, classes. When data structures need to be stored or transmitted to another location, such as across a network, they are serialized.
When objects with pointer references to other member variables are serialized, the referenced objects are tracked and serialized, ensuring that the same object is not serialized more than once. However, all nested objects must be serializable too.
Finally, the serialized data stream is persisted in a byte sequence using a standard format. ISO-8859-1 is a popular format for 1-byte representation of English characters and numerals. UTF-8 is the world standard for encoding multilingual, mathematical and scientific data; each character may take 1-4 bytes of data in Unicode.
Naive use of object serialization may allow a malicious party with access to the serialization byte stream to read private data, create objects with illegal or dangerous state, or obtain references to the private fields of deserialized objects. Workarounds are tedious, not guaranteed. Oracle has promised to do away with object serialization and allow programmers to choose from open formats such as JSON, XML, etc.
@JacksonXmlProperty can be applied to any field in a bean to control the details of the element that is being rendered. This annotation allows us to determine the namespace, the local name, and whether the field is serialized as an Element or an Attribute. For example, the following bean: 2b1af7f3a8