QUESTION:

Pick three of your favorite books on one of your favorite subjects. At least one of the books should have more than one author. For each book, include the title, authors, and two or three other attributes that you find interesting. Take the information that you’ve selected about these three books, and separately create three files which store the book’s information in HTML (using an html table), XML, and JSON formats (e.g. “books.html”, “books.xml”, and “books.json”). To help you better understand the different file structures, I’d prefer that you create each of these files “by hand” unless you’re already very comfortable with the file formats.

DIRECTION:

Write R code, using your packages of choice, to load the information from each of the three sources into separate R data frames.

XML Format

# Please kindly install these packages if you dont have it yet, and load it.
library(XML)
library(RCurl)
## Loading required package: bitops
library(knitr)
library(htmltab)
## Warning: package 'htmltab' was built under R version 3.2.4
library(jsonlite)

# Getting xml data loaded from URL

url = "https://raw.githubusercontent.com/mascotinme/MSDA-IS607/f896255f3b817cad1496bb767922bb7c72457422/book.xml"
data = getURL(url, ssl.verifypeer=0L, followlocation=1L)
book1 <- xmlParse(data)
book <- xmlToDataFrame(book1)
kable(head(book))
name isbn author year pages genre type
Engineering mathematics: 7th Edition 978-1100005 Dexter Booth, Ken Stroud 2013 1057 Educational Hard Cover
American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History 978-0062238863 Chris Kyle, Scott McEwen, Jim Defelice 2013 448 Literary Literature PaperBack
the catcher in the rye 978-0316769488 j.d salinger 1951 240 coming of age PaperBack

HTML FORMAT

# load HTML data from URL and ingnore the warning statement(s).
options(warn = -1)

url = "https://raw.githubusercontent.com/mascotinme/MSDA-IS607/master/Books1.html"

books_html = htmltab(doc = url, which = 1)
books_html = data.frame(books_html, row.names = NULL)
kable(books_html)
Name ISBN Author Year Pages Genre Type
Engineering mathematics: 7th Edition 978-1100000000 Dexter Booth, Ken Stroud 2013 1057 Educational Hard Cover
American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History 978-0062238863 Chris Kyle, Scott McEwen, Jim Defelice 2013 448 Literary literature PackBack
The Catcher In The Rye 978-0316769488 J.D Salinger 1951 240 Coming of Age PackBack

JSON FORMAT

#loading json file from URL

url2 = "https://raw.githubusercontent.com/mascotinme/MSDA-IS607/master/Books.json"

books_json = getURL(url2)
books_json = fromJSON(books_json)
kable(books_json)
Name ISBN Author Year Pages Genre Type
Engineering mathematics: 7th Edition 978-1100005 Dexter Booth, Ken Stroud 2013 1057 Educational Hard Cover
American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History 978-0062238863 Chris Kyle, Scott McEwen, Jim Defelice 2013 448 Literary Literature PaperBack
the catcher in the rye 978-0316769488 J.D Salinger 1951 240 Coming of Age PaperBack

Question: Are the three data frames identical?

YES!, the three data frames are identical.

REFERENCES:

http://www.rprimer.dk/index.php?page=showrule&index=2

https://cran.r-project.org/web/packages/jsonlite/vignettes/json-aaquickstart.html

http://www.w3schools.com/xml/