[英]xml with nested siblings to data frame in R
我是R中解析XML的新手。我試圖將XML解析為可行的數據框。 我已經嘗試了XML包中的一些XPath函數,但似乎無法得出正確的答案。
這是我的XML:
<ResidentialProperty>
<Listing>
<StreetAddress>
<StreetNumber>11111</StreetNumber>
<StreetName>111th</StreetName>
<StreetSuffix>Avenue Ct</StreetSuffix>
<StateOrProvince>WA</StateOrProvince>
</StreetAddress>
<MLSInformation>
<ListingStatus Status="Active"/>
<StatusChangeDate>2015-07-05T23:48:53.410</StatusChangeDate>
</MLSInformation>
<GeographicData>
<Latitude>11.111111</Latitude>
<Longitude>-111.111111</Longitude>
<County>Pierce</County>
</GeographicData>
<SchoolData>
<SchoolDistrict>Puyallup</SchoolDistrict>
</SchoolData>
<View>Territorial</View>
</Listing>
<YearBuilt>1997</YearBuilt>
<InteriorFeatures>Bath Off Master,Dbl Pane/Storm Windw</InteriorFeatures>
<Occupant>
<Name>Vacant</Name>
</Occupant>
<WaterFront/>
<Roof>Composition</Roof>
<Exterior>Brick,Cement Planked,Wood,Wood Products</
</ResidentialProperty>
當我跑步時:
ResidentialProperty <- xmlToDataFrame(nodes=getNodeSet(doc,"//ResidentialProperty"))
父節點內的子節點的值被壓縮為:
11111111thAvenue CtWA2015-07-05T23:48:53.41011.111111-111.111111PiercePuyallupTerritorial
如果我將一個節點下移到,則會發生相同的事情:
11111111thAvenue CtWA
子節點的值全部粘貼在一起。
我還嘗試了一種行之有效的蠻力方法:
StreetAddress <- xmlToDataFrame(nodes=getNodeSet(doc,"//StreetAddress"))
MLSInformation <- xmlToDataFrame(nodes=getNodeSet(doc,"//MLSInformation"))
GeographicData <- xmlToDataFrame(nodes=getNodeSet(doc,"//GeographicData"))
SchoolData <- xmlToDataFrame(nodes=getNodeSet(doc,"//SchoolData"))
YearBuilt <- xmlToDataFrame(nodes=getNodeSet(doc,"//YearBuilt"))
InteriorFeatures <- xmlToDataFrame(nodes=getNodeSet(doc,"//InteriorFeatures"))
Occupant <- xmlToDataFrame(nodes=getNodeSet(doc,"//Occupant"))
Roof <- xmlToDataFrame(nodes=getNodeSet(doc,"//Roof"))
Exterior <- xmlToDataFrame(nodes=getNodeSet(doc,"//Exterior"))
df <- cbind(StreetAddress, MLSInformation, GeographicData, SchoolData, YearBuilt, InteriorFeatures, Occupant, Roof, Exterior)
但是某些列名稱與預期不符:
> colnames(df)
[1] "StreetNumber" "StreetName" "StreetSuffix" "StateOrProvince" "ListingStatus"
[6] "StatusChangeDate" "Latitude" "Longitude" "County" "SchoolDistrict"
[11] "text" "text" "Name" "text" "text"
colnames[11,12,14,15]
應為"YearBuilt", "InteriorFeatures", "Roof", and "Exterior"
。 (旁注-為什么會發生這種情況?)
我正在嘗試找到一種方法,可以將每個原子值排序到數據框的適當列中,其中列名是節點的名稱,即使在嵌套的子節點內也是如此。 另外,我的數據可能會隨時間變化,因此我正在尋找一種動態函數來符合數據,並在可能的情況下產生預期的結果。
我以為這是一個有點普通的XML模式(帶有嵌套的子層),所以我很驚訝地沒有找到關於該主題的太多信息,盡管我可能在搜索中只是使用了錯誤的術語。 我猜有一個簡單的答案。 你有什么建議嗎?
考慮到xml
包含您的示例字符串,這是具有不同項目數量的住宅屬性的另一種策略:
library(XML)
library(plyr)
# xml <- '<ResidentialProperty>........'
doc <- xmlParse(xml, asText = TRUE)
df <- do.call(rbind.fill, lapply(doc['//ResidentialProperty'], function(x) {
names <- xpathSApply(x, './/.', xmlName)
names <- names[which(names == "text") - 1]
values <- xpathSApply(x, ".//text()", xmlValue)
return(as.data.frame(t(setNames(values, names)), stringsAsFactors = FALSE))
}))
df
# StreetNumber StreetName StreetSuffix StateOrProvince StatusChangeDate Latitude Longitude County SchoolDistrict View YearBuilt InteriorFeatures Name Roof Exterior
# 1 11111 111th Avenue Ct WA 2015-07-05T23:48:53.410 11.111111 -111.111111 Pierce Puyallup Territorial 1997 Bath Off Master,Dbl Pane/Storm Windw Vacant Composition Brick,Cement Planked,Wood,Wood Products
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