如何从xml文件创建R数据帧

我有一个XML文档文件.该文件的一部分如下所示：

-<attr>  
     <attrlabl>COUNTY</attrlabl>  
     <attrdef>County abbreviation</attrdef>  
     <attrtype>Text</attrtype>  
     <attwidth>1</attwidth>  
     <atnumdec>0</atnumdec>  
    -<attrdomv>  
        -<edom>  
            <edomv>C</edomv>  
            <edomvd>Clackamas County</edomvd>  
            <edomvds/>  
         </edom>  
        -<edom>  
            <edomv>M</edomv>  
            <edomvd>Multnomah County</edomvd>  
            <edomvds/>  
         </edom>  
        -<edom>  
            <edomv>W</edomv>  
            <edomvd>Washington County</edomvd>  
            <edomvds/>  
         </edom>  
     </attrdomv>  
 </attr>

从这个XML文件中,我想创建一个带有attrlabl,attrdef,attrtype和attrdomv列的R数据框.请注意,attrdomv列应包含category变量的所有级别.数据框应如下所示：

attrlabl    attrdef                attrtype    attrdomv  
COUNTY      County abbreviation    Text        C Clackamas County; M Multnomah County; W Washington County

我有一个不完整的代码,如下所示：

doc <- xmlParse("taxlots.shp.xml")  
dataDictionary <- xmlToDataFrame(getNodeSet(doc,"//attrlabl"))

你能完成我的R代码吗？我感谢任何帮助！

假设这是正确的taxlots.shp.xml文件：

<attr>  
     <attrlabl>COUNTY</attrlabl>  
     <attrdef>County abbreviation</attrdef>  
     <attrtype>Text</attrtype>  
     <attwidth>1</attwidth>  
     <atnumdec>0</atnumdec>  
    <attrdomv>  
        <edom>  
            <edomv>C</edomv>  
            <edomvd>Clackamas County</edomvd>  
            <edomvds/>  
         </edom>  
        <edom>  
            <edomv>M</edomv>  
            <edomvd>Multnomah County</edomvd>  
            <edomvds/>  
         </edom>  
        <edom>  
            <edomv>W</edomv>  
            <edomvd>Washington County</edomvd>  
            <edomvds/>  
         </edom>  
     </attrdomv>  
 </attr>

你几乎在那里：

doc <- xmlParse("taxlots.shp.xml")
xmlToDataFrame(nodes=getNodeSet(doc1,"//attr"))[c("attrlabl","attrdef","attrtype","attrdomv")]
  attrlabl             attrdef attrtype                                             attrdomv
1   COUNTY County abbreviation     Text CClackamas CountyMMultnomah CountyWWashington County

但是最后一个字段没有您想要的格式.为此,需要一些额外的步骤：

step1 <- xmlToDataFrame(nodes=getNodeSet(doc1,"//attrdomv/edom"))
step1
  edomv            edomvd edomvds
1     C  Clackamas County        
2     M  Multnomah County        
3     W Washington County  

step2 <- paste(paste(step1$edomv,step1$edomvd,sep=" "),collapse="; ")
step2
[1] "C Clackamas County; M Multnomah County; W Washington County"

cbind(xmlToDataFrame(nodes= getNodeSet(doc1,"attrtype")],attrdomv= step2)
  attrlabl             attrdef attrtype                                                      attrdomv
1   COUNTY County abbreviation     Text C Clackamas County; M Multnomah County; W Washington County

原文链接：https://www.f2er.com/xml/293117.html

如何从xml文件创建R数据帧

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