Data Formats: XML and JSON Flashcards by John Emy Bautista

Extensible Markup Language

XML

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A text-based format for representing structured information.

XML

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XML was derived from an older standard format called _ _ _ _ (______________)

SGML (Standard Generalized Markup Language)

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XML is used as a ____________.

Metalanguage

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A language used to describe other languages.

Metalanguage

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XML is the basis of many format standard today such as: (4)

UBL, HTML, SVG, MathML

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The most recognizable features of XML is the _______. AKA the tags or elements.

markup

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XML elements can contain: (3)

Text
Attributes
Other Elements

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In XML naming rules, Element/Tag names are _____________.

Case Sensitive

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In XML naming rules, can element/tag names contain numbers?

Yes

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In XML naming rules, can element/tag names contain hyphens?

Yes

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In XML naming rules, can element/tag names contain underscores?

Yes

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In XML naming rules, can element/tag names contain period?

Yes

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In XML naming rules, can element/tag names only start with letter or hyphen?

No, only with letter or underscore

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In XML naming rules, can element/tag names contain spaces?

True or False: XML tags may or may not be closed.

False, they must be closed.

True or False: Attributes must be quoted in XML tags.

True

Question in PPT: Why do we need XML?

Lets you define and store data in a shareable manner (from AWS)
Allows for storing and sharing data in a structured format.

An XML document that describes the structure of other XML-based languages.

XML Schema

They contain constraints about the syntax and valid data types of the document they are describing.

XML Schema

XML Schemas provide the following info about a language: (3)

List of Valid Elements
Valid types for the elements
Structure/syntax of the language

Documents that use known schemas can use _________________ like HTML’s DTD

single-line schema declarations
ex. <!doctype html>

Programs that parse XML content: (2)

XML Validators
Code Editors

PL/script independent but it shares analogous concepts with most programming languages.

JSON

JSON data is built on 2 structures: (2)

Object Arrays

Are key-value pairs separated by _____ and delimited by ________

colons, commas

Are ordered list of values. The contents of an array doesn't have to be of a single type.

Arrays.

Sequence of one or more unicode characters, surrounded by double qoutes.

The process of converting data structures/ object states into formats that can be stored and later reconstructed.

An object to be serialized may be an _____/_____________ created by a running program

object/data structure in memory

Common format choices for transporting data over the web.

XML

The reverse process whereby data in a serial format is restored into memory (for a program to use).

Deserialization

True or False: Both JSON and XML are self-describing (human readable).

True

True or False: Both JSON is hierarchal while XML is unstratified.

False, both are hierarchal

True or False: JSON is a standard content type on the web while xml is an obsolete type.

False, both are standard.

True or False: XML is more verbose than JSON.

True

The only explicit data type of XML is _______.

String

True or False: XML has ambiguous interpretations while JSON has no ambiguity.

True

True or False: Many PLs support JSON in parsing and writing JSON while only a few supports XML.

False, many supports for both format.