r - 用 xml2 解析 xml
问题描述
我正在尝试使用 xml2 库解析 XML 文件 xml_name(doc) 和 xml_children(doc) 都产生了预期的输出,但是当我尝试使用 xml_find_all 提取一些数据时,它返回 {xml_nodeset (0)} 我在做什么错?
library(xml2)
doc<-read_xml('<export xmlns="http://eu.europa.ec/fpi/fsd/export" generationDate="2018-06-15T19:29:31.078+02:00" globalFileId="117284">
<sanctionEntity designationDetails="" unitedNationId="" euReferenceNumber="EU.36.64" logicalId="1">
<regulation regulationType="amendment" organisationType="commission" publicationDate="2018-02-16" entryIntoForceDate="2018-02-16" numberTitle="2018/223 (OJ L43)" programme="ZWE" logicalId="110201">
<publicationUrl>http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32018R0223&from=EN</publicationUrl>
</regulation>
<subjectType code="person" classificationCode="P"/>
<nameAlias firstName="Robert" middleName="Gabriel" lastName="Mugabe" wholeName="Robert Gabriel Mugabe" function="Former President" gender="M" title="" nameLanguage="" strong="true" regulationLanguage="en" logicalId="1">
<regulationSummary regulationType="amendment" publicationDate="2018-02-16" numberTitle="2018/223 (OJ L43)" publicationUrl="http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32018R0223&from=EN"/>
</nameAlias>
<birthdate circa="false" calendarType="GREGORIAN" city="" zipCode="" birthdate="1924-02-21" dayOfMonth="21" monthOfYear="2" year="1924" region="" place="" countryIso2Code="00" countryDescription="UNKNOWN" regulationLanguage="en" logicalId="1">
<regulationSummary regulationType="amendment" publicationDate="2005-06-16" numberTitle="898/2005 (OJ L153)" publicationUrl="http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2005:153:0009:0014:EN:PDF"/>
</birthdate>
<identification diplomatic="false" knownExpired="false" knownFalse="false" reportedLost="false" revokedByIssuer="false" issuedBy="" latinNumber="" nameOnDocument="" number="AD001095" region="" countryIso2Code="00" countryDescription="UNKNOWN" identificationTypeCode="passport" identificationTypeDescription="National passport" regulationLanguage="en" logicalId="315">
<remark>(passport)</remark>
<regulationSummary regulationType="amendment" publicationDate="2012-02-22" numberTitle="151/2012 (OJ L49)" publicationUrl="http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2012:049:0002:0016:EN:PDF"/>
</identification>
</sanctionEntity>
<sanctionEntity designationDate="2002-02-21" designationDetails="" unitedNationId="" euReferenceNumber="EU.36.64" logicalId="1">
<remark>Date of designation referred to in Article 7 (2): 21.2.2002.</remark>
<regulation regulationType="amendment" organisationType="commission" publicationDate="2002-09-13" entryIntoForceDate="2002-09-13" numberTitle="1643/2002 (OJ L247)" programme="ZWE" logicalId="1296">
<publicationUrl>http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2002:247:0022:0024:EN:PDF</publicationUrl>
</regulation>
<subjectType code="person" classificationCode="P"/>
<nameAlias firstName="Robert" middleName="Gabriel" lastName="Mugabe" wholeName="Robert Gabriel Mugabe" function="president" gender="M" title="" nameLanguage="" strong="true" regulationLanguage="en" logicalId="101396">
<regulationSummary regulationType="amendment" publicationDate="2002-09-13" numberTitle="1643/2002 (OJ L247)" publicationUrl="http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2002:247:0022:0024:EN:PDF"/>
</nameAlias>
<birthdate circa="false" calendarType="GREGORIAN" city="Kutama" zipCode="" birthdate="1924-02-21" dayOfMonth="21" monthOfYear="2" year="1924" region="" place="" countryIso2Code="00" countryDescription="UNKNOWN" regulationLanguage="en" logicalId="101395">
<regulationSummary regulationType="amendment" publicationDate="2002-09-13" numberTitle="1643/2002 (OJ L247)" publicationUrl="http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2002:247:0022:0024:EN:PDF"/>
</birthdate>
</sanctionEntity>
</export>
')
xml_name(doc)
xml_children(doc)
xml_find_all(doc, ".//sanctionEntity")
xml_find_all(doc, ".//publicationDate")
解决方案
尝试使用:
xml_find_all(doc, ".//*[name()='sanctionEntity']")
{xml_nodeset (2)}
[1] <sanctionEntity designationDetails="" unitedNationId="" euReferenceNumber="EU.36.64" logicalId="1">\n ...
[2] <sanctionEntity designationDate="2002-02-21" designationDetails="" unitedNationId="" euReferenceNumber= ..
xml_find_all(doc, ".//*[name()='sanctionEntity']") %>% map(xml_find_all, "./*")
[[1]]
{xml_nodeset (5)}
[1] <regulation regulationType="amendment" organisationType="commission" publicationDate="2018-02-16" entry ...
[2] <subjectType code="person" classificationCode="P"/>
[3] <nameAlias firstName="Robert" middleName="Gabriel" lastName="Mugabe" wholeName="Robert Gabriel Mugabe" ...
[4] <birthdate circa="false" calendarType="GREGORIAN" city="" zipCode="" birthdate="1924-02-21" dayOfMonth= ...
[5] <identification diplomatic="false" knownExpired="false" knownFalse="false" reportedLost="false" revoked ...
[[2]]
{xml_nodeset (5)}
[1] <remark>Date of designation referred to in Article 7 (2): 21.2.2002.</remark>
[2] <regulation regulationType="amendment" organisationType="commission" publicationDate="2002-09-13" entry ...
[3] <subjectType code="person" classificationCode="P"/>
[4] <nameAlias firstName="Robert" middleName="Gabriel" lastName="Mugabe" wholeName="Robert Gabriel Mugabe" ...
[5] <birthdate circa="false" calendarType="GREGORIAN" city="Kutama" zipCode="" birthdate="1924-02-21" dayOf ...
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