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This allows WCF to work with XML, but always using the most appropriate format based on interoperability and performance requirements Encoding is the term used to describe the process of converting a WCF message into an array of bytes This is done so that the message can be sent across a transport protocol WCF provides ve types of encoding formats: binary, text, Message Transmission Optimization Mechanism (MTOM), JavaScript Object Notation, and Plain-Old-XML (POX) Which one you use will depend on your application s requirements For example, you may encoder for optimal performance want to use the or between NET applications, use the encoder for interoperability based on WS-* Web services, or encoder for AJAX-based Web applications use the Encoders are one of the extensibility mechanisms provided by WCF; therefore, WCF can be extended to support new encoders if the encoders provided do not satisfy your requirements The rest of this chapter looks at how WCF uses serialization and encoding to transmit messages across a transport We will examine the different forms of serialization and encoding and present scenarios where each option should be used

By default, the element tree parser uses the expat XML parser under the hood which is why we must be ready to catch expat exceptions

selfclear() for element in treefindall("incident"): try: data = {} for attribute in ("report_id", "date", "aircraft_id", "aircraft_type", "pilot_percent_hours_on_type", "pilot_total_hours", "midair"): data[attribute] = elementget(attribute) data["date"] = datetimedatetimestrptime( data["date"], "%Y-%m-%d")date() data["pilot_percent_hours_on_type"] = ( float(data["pilot_percent_hours_on_type"])) data["pilot_total_hours"] = int( data["pilot_total_hours"]) data["midair"] = bool(int(data["midair"])) data["airport"] = elementfind("airport")textstrip() narrative = elementfind("narrative")text data["narrative"] = (narrativestrip() if narrative is not None else "") incident = Incident(**data) self[incidentreport_id] = incident except (ValueError, LookupError, IncidentError) as err: print("{0}: import error: {1}"format( ospathbasename(sysargv[0]), err)) return False return True

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[ Team LiB ] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [X] J2ME [See Java 2 Micro Edition] Japanese language Java 2 Micro Edition architecture chapter Java 2 Micro Edition:configuration configuration Java 2 Micro Edition:optional package optional package Java 2 Micro Edition:profile profile Java Application Manager JAM: [See Java Application Manager] Java Archive files JAR: [See Java Archive files] Java Community Process JCP: [See Java Community Process] Java Language Specification:compatibility with compatibility:with Java Language Specification Java libraries Java virtual machine Java Virtual Machine Specification:compatibility with compatibility:with Java Virtual Machine Specification [ Team LiB ]

Once we have the element tree we can iterate over every <incident> using the xmletreeElementTreefindall() method Each incident is returned as an xmletreeElement object We use the same technique for handling the element attributes as we did in the previous section s import_text_regex() method rst we store all the values in the data dictionary, and then we convert those values which are dates, numbers, or Booleans to the correct type For the airport and narrative subelements we use the xmletreeElementfind() method to nd them and read their text attributes If a text element has no text its text attribute will be None, so we must account for this when reading the narrative text element since it might be empty In all cases, the attribute values and text returned to us do not contain XML escapes since they are automatically unescaped As with all the XML parsers used to process aircraft incident data, an exception will occur if the aircraft or narrative element is missing, or if one of the attributes is missing, or if one of the conversions fails, or if any of the numeric data is out of range this ensures that invalid data will cause parsing to stop and for an error message to be output The code at the end for creating and storing incidents and for handling exceptions is the same as we have seen before

There are many ways to use serialization objects using WCF Determining which mechanism to use for serialization depends on a number of factors These include whether you want to share types or contracts, support existing NET types, preserve references, and more

DOM (Document Object Model)

The DOM is a standard API for representing and manipulating an XML document in memory The code for creating a DOM and writing it to a le, and for parsing an XML le using a DOM, is structurally very similar to the element tree code, only slightly longer We will begin by reviewing the export_xml_dom() method in two parts This method works in two phases: First a DOM is created to re ect the incident data, and then the DOM is written out to a le Just as with an element tree, some programs might use the DOM as their data structure, in which case they can simply write out the data

[ Team LiB ] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [X] K Virtual Machine KVM: [See K Virtual Machine] key events keys [ Team LiB ]

def export_xml_dom(self, filename): dom = xmldomminidomgetDOMImplementation() tree = domcreateDocument(None, "incidents", None) root = treedocumentElement for incident in selfvalues(): element = treecreateElement("incident") for attribute, value in ( ("report_id", incidentreport_id), ("date", incidentdateisoformat()), ("aircraft_id", incidentaircraft_id), ("aircraft_type", incidentaircraft_type), ("pilot_percent_hours_on_type", str(incidentpilot_percent_hours_on_type)),

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