对于包在顶部元素中定义了显式xmlns命名空间的XML文档，我没有得到软件包XML（参数命名空间）所要求的XPath表达式和命名空间规范的正确组合。
下面是我的代码的结构
formslist.URL <- "http://sharepoint2/ops/quality/audit_program_management_site/_vti_bin/ListData.svc/Admin_Audit_Forms_List"
dat.formslist = xmlParse(getURL(formslist.URL, userpwd = 'SP_OpReporting:Essendant216!'))
items.formslist = getNodeSet(dat.formslist, "//m:properties")
df.formslist = xmlToDataFrame(items.formslist, stringsAsFactors = FALSE)
formsURL.vec = levels(factor(df.formslist$ProcessAuditForm))
URL.formname.index = regexpr(", ", formsURL.vec)
auditforms.list = substr(x = formsURL.vec, start = (2 + URL.formname.index), stop = nchar(formsURL.vec))
它返回以下错误
XPath错误：未定义的名称空间前缀 XPath错误：表达式无效 警告：xpathApply.XMLInternalDocument中的错误：计算xpath表达式时出错// m：properties
52：xpathApply.XMLInternalDocument
50：getNodeSet
xpathApply.XMLInternalDocument中的错误（doc，path，fun，...，名称空间=名称空间，：评估xpath表达式时出错// m：properties