Prof. Walmes Marques Zeviani
23 Fev 2017
XML é uma abordagem geral para representar de dados em diversos formatos.
Fornecer uma razoável definição e explicação para os vários aspectos da linguagem XML e ilustrar alguns dialetos, além de apresentar uma visão geral da sintaxe e estrutura do XML.
str(mtcars)
## 'data.frame': 32 obs. of 11 variables:
## $ mpg : num 21 21 22.8 21.4 18.7 18.1 14.3 24.4 22.8 19.2 ...
## $ cyl : num 6 6 4 6 8 6 8 4 4 6 ...
## $ disp: num 160 160 108 258 360 ...
## $ hp : num 110 110 93 110 175 105 245 62 95 123 ...
## $ drat: num 3.9 3.9 3.85 3.08 3.15 2.76 3.21 3.69 3.92 3.92 ...
## $ wt : num 2.62 2.88 2.32 3.21 3.44 ...
## $ qsec: num 16.5 17 18.6 19.4 17 ...
## $ vs : num 0 0 1 1 0 1 0 1 1 1 ...
## $ am : num 1 1 1 0 0 0 0 0 0 0 ...
## $ gear: num 4 4 4 3 3 3 3 4 4 4 ...
## $ carb: num 4 4 1 1 2 1 4 2 2 4 ...
write.table(mtcars,
file = "mtcars.ods",
quote = FALSE,
row.names = FALSE)
Abrir no Gnumeric e exportar para XML.
<title>Os Três Mosqueteiros</title>
.campo = "valor"
.<img src="image.png"></img>
<img src="image.png"/>
campo = "valor"
.parent
é o que está mais próximo da origem.Figura 1: MUNZERT et al. (2015), página 47.
Figura 2: MUNZERT et al. (2015), página 87.
install.packages("XML",
dependencies = TRUE,
repos = "http://cran-r.c3sl.ufpr.br/")
library(XML)
packageVersion("XML")
## [1] '3.98.1.16'
url <- "https://www.w3schools.com/Xml/plant_catalog.xml"
x <- readLines(url)
a <- xmlParse(x)
str(a)
## Classes 'XMLInternalDocument', 'XMLAbstractDocument' <externalptr>
a
## <?xml version="1.0" encoding="UTF-8"?>
## <CATALOG>
## <PLANT>
## <COMMON>Bloodroot</COMMON>
## <BOTANICAL>Sanguinaria canadensis</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$2.44</PRICE>
## <AVAILABILITY>031599</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Columbine</COMMON>
## <BOTANICAL>Aquilegia canadensis</BOTANICAL>
## <ZONE>3</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$9.37</PRICE>
## <AVAILABILITY>030699</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Marsh Marigold</COMMON>
## <BOTANICAL>Caltha palustris</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Mostly Sunny</LIGHT>
## <PRICE>$6.81</PRICE>
## <AVAILABILITY>051799</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Cowslip</COMMON>
## <BOTANICAL>Caltha palustris</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$9.90</PRICE>
## <AVAILABILITY>030699</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Dutchman's-Breeches</COMMON>
## <BOTANICAL>Dicentra cucullaria</BOTANICAL>
## <ZONE>3</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$6.44</PRICE>
## <AVAILABILITY>012099</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Ginger, Wild</COMMON>
## <BOTANICAL>Asarum canadense</BOTANICAL>
## <ZONE>3</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$9.03</PRICE>
## <AVAILABILITY>041899</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Hepatica</COMMON>
## <BOTANICAL>Hepatica americana</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$4.45</PRICE>
## <AVAILABILITY>012699</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Liverleaf</COMMON>
## <BOTANICAL>Hepatica americana</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$3.99</PRICE>
## <AVAILABILITY>010299</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Jack-In-The-Pulpit</COMMON>
## <BOTANICAL>Arisaema triphyllum</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$3.23</PRICE>
## <AVAILABILITY>020199</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Mayapple</COMMON>
## <BOTANICAL>Podophyllum peltatum</BOTANICAL>
## <ZONE>3</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$2.98</PRICE>
## <AVAILABILITY>060599</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Phlox, Woodland</COMMON>
## <BOTANICAL>Phlox divaricata</BOTANICAL>
## <ZONE>3</ZONE>
## <LIGHT>Sun or Shade</LIGHT>
## <PRICE>$2.80</PRICE>
## <AVAILABILITY>012299</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Phlox, Blue</COMMON>
## <BOTANICAL>Phlox divaricata</BOTANICAL>
## <ZONE>3</ZONE>
## <LIGHT>Sun or Shade</LIGHT>
## <PRICE>$5.59</PRICE>
## <AVAILABILITY>021699</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Spring-Beauty</COMMON>
## <BOTANICAL>Claytonia Virginica</BOTANICAL>
## <ZONE>7</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$6.59</PRICE>
## <AVAILABILITY>020199</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Trillium</COMMON>
## <BOTANICAL>Trillium grandiflorum</BOTANICAL>
## <ZONE>5</ZONE>
## <LIGHT>Sun or Shade</LIGHT>
## <PRICE>$3.90</PRICE>
## <AVAILABILITY>042999</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Wake Robin</COMMON>
## <BOTANICAL>Trillium grandiflorum</BOTANICAL>
## <ZONE>5</ZONE>
## <LIGHT>Sun or Shade</LIGHT>
## <PRICE>$3.20</PRICE>
## <AVAILABILITY>022199</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Violet, Dog-Tooth</COMMON>
## <BOTANICAL>Erythronium americanum</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$9.04</PRICE>
## <AVAILABILITY>020199</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Trout Lily</COMMON>
## <BOTANICAL>Erythronium americanum</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$6.94</PRICE>
## <AVAILABILITY>032499</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Adder's-Tongue</COMMON>
## <BOTANICAL>Erythronium americanum</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$9.58</PRICE>
## <AVAILABILITY>041399</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Anemone</COMMON>
## <BOTANICAL>Anemone blanda</BOTANICAL>
## <ZONE>6</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$8.86</PRICE>
## <AVAILABILITY>122698</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Grecian Windflower</COMMON>
## <BOTANICAL>Anemone blanda</BOTANICAL>
## <ZONE>6</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$9.16</PRICE>
## <AVAILABILITY>071099</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Bee Balm</COMMON>
## <BOTANICAL>Monarda didyma</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$4.59</PRICE>
## <AVAILABILITY>050399</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Bergamot</COMMON>
## <BOTANICAL>Monarda didyma</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$7.16</PRICE>
## <AVAILABILITY>042799</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Black-Eyed Susan</COMMON>
## <BOTANICAL>Rudbeckia hirta</BOTANICAL>
## <ZONE>Annual</ZONE>
## <LIGHT>Sunny</LIGHT>
## <PRICE>$9.80</PRICE>
## <AVAILABILITY>061899</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Buttercup</COMMON>
## <BOTANICAL>Ranunculus</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$2.57</PRICE>
## <AVAILABILITY>061099</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Crowfoot</COMMON>
## <BOTANICAL>Ranunculus</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$9.34</PRICE>
## <AVAILABILITY>040399</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Butterfly Weed</COMMON>
## <BOTANICAL>Asclepias tuberosa</BOTANICAL>
## <ZONE>Annual</ZONE>
## <LIGHT>Sunny</LIGHT>
## <PRICE>$2.78</PRICE>
## <AVAILABILITY>063099</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Cinquefoil</COMMON>
## <BOTANICAL>Potentilla</BOTANICAL>
## <ZONE>Annual</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$7.06</PRICE>
## <AVAILABILITY>052599</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Primrose</COMMON>
## <BOTANICAL>Oenothera</BOTANICAL>
## <ZONE>3 - 5</ZONE>
## <LIGHT>Sunny</LIGHT>
## <PRICE>$6.56</PRICE>
## <AVAILABILITY>013099</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Gentian</COMMON>
## <BOTANICAL>Gentiana</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Sun or Shade</LIGHT>
## <PRICE>$7.81</PRICE>
## <AVAILABILITY>051899</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Blue Gentian</COMMON>
## <BOTANICAL>Gentiana</BOTANICAL>
## <ZONE>4</ZONE>
## <LIGHT>Sun or Shade</LIGHT>
## <PRICE>$8.56</PRICE>
## <AVAILABILITY>050299</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Jacob's Ladder</COMMON>
## <BOTANICAL>Polemonium caeruleum</BOTANICAL>
## <ZONE>Annual</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$9.26</PRICE>
## <AVAILABILITY>022199</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Greek Valerian</COMMON>
## <BOTANICAL>Polemonium caeruleum</BOTANICAL>
## <ZONE>Annual</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$4.36</PRICE>
## <AVAILABILITY>071499</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>California Poppy</COMMON>
## <BOTANICAL>Eschscholzia californica</BOTANICAL>
## <ZONE>Annual</ZONE>
## <LIGHT>Sun</LIGHT>
## <PRICE>$7.89</PRICE>
## <AVAILABILITY>032799</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Shooting Star</COMMON>
## <BOTANICAL>Dodecatheon</BOTANICAL>
## <ZONE>Annual</ZONE>
## <LIGHT>Mostly Shady</LIGHT>
## <PRICE>$8.60</PRICE>
## <AVAILABILITY>051399</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Snakeroot</COMMON>
## <BOTANICAL>Cimicifuga</BOTANICAL>
## <ZONE>Annual</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$5.63</PRICE>
## <AVAILABILITY>071199</AVAILABILITY>
## </PLANT>
## <PLANT>
## <COMMON>Cardinal Flower</COMMON>
## <BOTANICAL>Lobelia cardinalis</BOTANICAL>
## <ZONE>2</ZONE>
## <LIGHT>Shade</LIGHT>
## <PRICE>$3.02</PRICE>
## <AVAILABILITY>022299</AVAILABILITY>
## </PLANT>
## </CATALOG>
##
class(a)
## [1] "XMLInternalDocument" "XMLAbstractDocument"
xmlSize(a)
## [1] 1
summary(a)
## $nameCounts
##
## AVAILABILITY BOTANICAL COMMON LIGHT PLANT
## 36 36 36 36 36
## PRICE ZONE CATALOG
## 36 36 1
##
## $numNodes
## [1] 253
b <- xmlToList(a)
str(b)
## List of 36
## $ PLANT:List of 6
## ..$ COMMON : chr "Bloodroot"
## ..$ BOTANICAL : chr "Sanguinaria canadensis"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$2.44"
## ..$ AVAILABILITY: chr "031599"
## $ PLANT:List of 6
## ..$ COMMON : chr "Columbine"
## ..$ BOTANICAL : chr "Aquilegia canadensis"
## ..$ ZONE : chr "3"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$9.37"
## ..$ AVAILABILITY: chr "030699"
## $ PLANT:List of 6
## ..$ COMMON : chr "Marsh Marigold"
## ..$ BOTANICAL : chr "Caltha palustris"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Mostly Sunny"
## ..$ PRICE : chr "$6.81"
## ..$ AVAILABILITY: chr "051799"
## $ PLANT:List of 6
## ..$ COMMON : chr "Cowslip"
## ..$ BOTANICAL : chr "Caltha palustris"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$9.90"
## ..$ AVAILABILITY: chr "030699"
## $ PLANT:List of 6
## ..$ COMMON : chr "Dutchman's-Breeches"
## ..$ BOTANICAL : chr "Dicentra cucullaria"
## ..$ ZONE : chr "3"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$6.44"
## ..$ AVAILABILITY: chr "012099"
## $ PLANT:List of 6
## ..$ COMMON : chr "Ginger, Wild"
## ..$ BOTANICAL : chr "Asarum canadense"
## ..$ ZONE : chr "3"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$9.03"
## ..$ AVAILABILITY: chr "041899"
## $ PLANT:List of 6
## ..$ COMMON : chr "Hepatica"
## ..$ BOTANICAL : chr "Hepatica americana"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$4.45"
## ..$ AVAILABILITY: chr "012699"
## $ PLANT:List of 6
## ..$ COMMON : chr "Liverleaf"
## ..$ BOTANICAL : chr "Hepatica americana"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$3.99"
## ..$ AVAILABILITY: chr "010299"
## $ PLANT:List of 6
## ..$ COMMON : chr "Jack-In-The-Pulpit"
## ..$ BOTANICAL : chr "Arisaema triphyllum"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$3.23"
## ..$ AVAILABILITY: chr "020199"
## $ PLANT:List of 6
## ..$ COMMON : chr "Mayapple"
## ..$ BOTANICAL : chr "Podophyllum peltatum"
## ..$ ZONE : chr "3"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$2.98"
## ..$ AVAILABILITY: chr "060599"
## $ PLANT:List of 6
## ..$ COMMON : chr "Phlox, Woodland"
## ..$ BOTANICAL : chr "Phlox divaricata"
## ..$ ZONE : chr "3"
## ..$ LIGHT : chr "Sun or Shade"
## ..$ PRICE : chr "$2.80"
## ..$ AVAILABILITY: chr "012299"
## $ PLANT:List of 6
## ..$ COMMON : chr "Phlox, Blue"
## ..$ BOTANICAL : chr "Phlox divaricata"
## ..$ ZONE : chr "3"
## ..$ LIGHT : chr "Sun or Shade"
## ..$ PRICE : chr "$5.59"
## ..$ AVAILABILITY: chr "021699"
## $ PLANT:List of 6
## ..$ COMMON : chr "Spring-Beauty"
## ..$ BOTANICAL : chr "Claytonia Virginica"
## ..$ ZONE : chr "7"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$6.59"
## ..$ AVAILABILITY: chr "020199"
## $ PLANT:List of 6
## ..$ COMMON : chr "Trillium"
## ..$ BOTANICAL : chr "Trillium grandiflorum"
## ..$ ZONE : chr "5"
## ..$ LIGHT : chr "Sun or Shade"
## ..$ PRICE : chr "$3.90"
## ..$ AVAILABILITY: chr "042999"
## $ PLANT:List of 6
## ..$ COMMON : chr "Wake Robin"
## ..$ BOTANICAL : chr "Trillium grandiflorum"
## ..$ ZONE : chr "5"
## ..$ LIGHT : chr "Sun or Shade"
## ..$ PRICE : chr "$3.20"
## ..$ AVAILABILITY: chr "022199"
## $ PLANT:List of 6
## ..$ COMMON : chr "Violet, Dog-Tooth"
## ..$ BOTANICAL : chr "Erythronium americanum"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$9.04"
## ..$ AVAILABILITY: chr "020199"
## $ PLANT:List of 6
## ..$ COMMON : chr "Trout Lily"
## ..$ BOTANICAL : chr "Erythronium americanum"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$6.94"
## ..$ AVAILABILITY: chr "032499"
## $ PLANT:List of 6
## ..$ COMMON : chr "Adder's-Tongue"
## ..$ BOTANICAL : chr "Erythronium americanum"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$9.58"
## ..$ AVAILABILITY: chr "041399"
## $ PLANT:List of 6
## ..$ COMMON : chr "Anemone"
## ..$ BOTANICAL : chr "Anemone blanda"
## ..$ ZONE : chr "6"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$8.86"
## ..$ AVAILABILITY: chr "122698"
## $ PLANT:List of 6
## ..$ COMMON : chr "Grecian Windflower"
## ..$ BOTANICAL : chr "Anemone blanda"
## ..$ ZONE : chr "6"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$9.16"
## ..$ AVAILABILITY: chr "071099"
## $ PLANT:List of 6
## ..$ COMMON : chr "Bee Balm"
## ..$ BOTANICAL : chr "Monarda didyma"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$4.59"
## ..$ AVAILABILITY: chr "050399"
## $ PLANT:List of 6
## ..$ COMMON : chr "Bergamot"
## ..$ BOTANICAL : chr "Monarda didyma"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$7.16"
## ..$ AVAILABILITY: chr "042799"
## $ PLANT:List of 6
## ..$ COMMON : chr "Black-Eyed Susan"
## ..$ BOTANICAL : chr "Rudbeckia hirta"
## ..$ ZONE : chr "Annual"
## ..$ LIGHT : chr "Sunny"
## ..$ PRICE : chr "$9.80"
## ..$ AVAILABILITY: chr "061899"
## $ PLANT:List of 6
## ..$ COMMON : chr "Buttercup"
## ..$ BOTANICAL : chr "Ranunculus"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$2.57"
## ..$ AVAILABILITY: chr "061099"
## $ PLANT:List of 6
## ..$ COMMON : chr "Crowfoot"
## ..$ BOTANICAL : chr "Ranunculus"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$9.34"
## ..$ AVAILABILITY: chr "040399"
## $ PLANT:List of 6
## ..$ COMMON : chr "Butterfly Weed"
## ..$ BOTANICAL : chr "Asclepias tuberosa"
## ..$ ZONE : chr "Annual"
## ..$ LIGHT : chr "Sunny"
## ..$ PRICE : chr "$2.78"
## ..$ AVAILABILITY: chr "063099"
## $ PLANT:List of 6
## ..$ COMMON : chr "Cinquefoil"
## ..$ BOTANICAL : chr "Potentilla"
## ..$ ZONE : chr "Annual"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$7.06"
## ..$ AVAILABILITY: chr "052599"
## $ PLANT:List of 6
## ..$ COMMON : chr "Primrose"
## ..$ BOTANICAL : chr "Oenothera"
## ..$ ZONE : chr "3 - 5"
## ..$ LIGHT : chr "Sunny"
## ..$ PRICE : chr "$6.56"
## ..$ AVAILABILITY: chr "013099"
## $ PLANT:List of 6
## ..$ COMMON : chr "Gentian"
## ..$ BOTANICAL : chr "Gentiana"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Sun or Shade"
## ..$ PRICE : chr "$7.81"
## ..$ AVAILABILITY: chr "051899"
## $ PLANT:List of 6
## ..$ COMMON : chr "Blue Gentian"
## ..$ BOTANICAL : chr "Gentiana"
## ..$ ZONE : chr "4"
## ..$ LIGHT : chr "Sun or Shade"
## ..$ PRICE : chr "$8.56"
## ..$ AVAILABILITY: chr "050299"
## $ PLANT:List of 6
## ..$ COMMON : chr "Jacob's Ladder"
## ..$ BOTANICAL : chr "Polemonium caeruleum"
## ..$ ZONE : chr "Annual"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$9.26"
## ..$ AVAILABILITY: chr "022199"
## $ PLANT:List of 6
## ..$ COMMON : chr "Greek Valerian"
## ..$ BOTANICAL : chr "Polemonium caeruleum"
## ..$ ZONE : chr "Annual"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$4.36"
## ..$ AVAILABILITY: chr "071499"
## $ PLANT:List of 6
## ..$ COMMON : chr "California Poppy"
## ..$ BOTANICAL : chr "Eschscholzia californica"
## ..$ ZONE : chr "Annual"
## ..$ LIGHT : chr "Sun"
## ..$ PRICE : chr "$7.89"
## ..$ AVAILABILITY: chr "032799"
## $ PLANT:List of 6
## ..$ COMMON : chr "Shooting Star"
## ..$ BOTANICAL : chr "Dodecatheon"
## ..$ ZONE : chr "Annual"
## ..$ LIGHT : chr "Mostly Shady"
## ..$ PRICE : chr "$8.60"
## ..$ AVAILABILITY: chr "051399"
## $ PLANT:List of 6
## ..$ COMMON : chr "Snakeroot"
## ..$ BOTANICAL : chr "Cimicifuga"
## ..$ ZONE : chr "Annual"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$5.63"
## ..$ AVAILABILITY: chr "071199"
## $ PLANT:List of 6
## ..$ COMMON : chr "Cardinal Flower"
## ..$ BOTANICAL : chr "Lobelia cardinalis"
## ..$ ZONE : chr "2"
## ..$ LIGHT : chr "Shade"
## ..$ PRICE : chr "$3.02"
## ..$ AVAILABILITY: chr "022299"
c <- xmlToDataFrame(a)
str(c)
## 'data.frame': 36 obs. of 6 variables:
## $ COMMON : chr "Bloodroot" "Columbine" "Marsh Marigold" "Cowslip" ...
## $ BOTANICAL : chr "Sanguinaria canadensis" "Aquilegia canadensis" "Caltha palustris" "Caltha palustris" ...
## $ ZONE : chr "4" "3" "4" "4" ...
## $ LIGHT : chr "Mostly Shady" "Mostly Shady" "Mostly Sunny" "Mostly Shady" ...
## $ PRICE : chr "$2.44" "$9.37" "$6.81" "$9.90" ...
## $ AVAILABILITY: chr "031599" "030699" "051799" "030699" ...
text <- '
<person gender="female" bithday="23-May">Ana Smith</person>'
a <- xmlParse(text, asText = TRUE)
str(a)
## Classes 'XMLInternalDocument', 'XMLAbstractDocument' <externalptr>
a
## <?xml version="1.0"?>
## <person gender="female" bithday="23-May">Ana Smith</person>
##
b <- xmlRoot(a)
str(b)
## Classes 'XMLInternalElementNode', 'XMLInternalNode', 'XMLAbstractNode' <externalptr>
b
## <person gender="female" bithday="23-May">Ana Smith</person>
xmlAttrs(b)
## gender bithday
## "female" "23-May"
xmlValue(b)
## [1] "Ana Smith"
MUNZERT, S.; RUBBA, C.; MEIßNER, P.; NYHUIS, D. Automated Data Collection with R: A Practical Guide to Web Scraping and Text Mining. Wiley, 2015.