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[SOLVED] Help with xml, xpath, namespaces.

cindyharpercindyharper Member Posts: 9 Contributor II
edited November 2018 in Help
Below is sample XML from GoogleCSE API:

<?xml version="1.0" encoding="UTF-8"?>
<feed gd:kind="customsearch#search" xmlns="http://www.w3.org/2005/Atom" xmlns:cse="http://schemas.google.com/cseapi/2010" xmlns:gd="http://schemas.google.com/g/2005" xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/">
<title>Google Custom Search -  Albertus Magnus College.  library  Albertus Magnus College Library intitle:newsletter albertus.edu</title>
<id>tag:www.googleapis.com,2010-09-29:/customsearch/v1?q= Albertus Magnus College.  library  Albertus Magnus College Library intitle:newsletter albertus.edu&amp;cx=008033228147187897025:-ua_scxr1uc&amp;num=7&amp;start=1&amp;safe=off</id>
<author>
 <name>Library Website Search Engine - Google Custom Search</name>
</author>
<updated>1970-01-16T11:10:30.455Z</updated>
<opensearch:Url type="application/atom+xml" template="https://www.googleapis.com/customsearch/v1?q={searchTerms}&amp;num={count?}&amp;start={startIndex?}&amp;lr={language?}&amp;safe={cse:safe?}&amp;cx={cse:cx?}&amp;cref={cse:cref?}&amp;sort={cse:sort?}&amp;filter={cse:filter?}&amp;gl={cse:gl?}&amp;cr={cse:cr?}}&amp;googlehost={cse:googleHost?}&amp;c2coff={?cse:disableCnTwTranslation}&amp;hq={cse:hq?}&amp;hl={cse:hl?}&amp;siteSearch={cse:siteSearch?}&amp;siteSearchFilter={cse:siteSearchFilter?}&amp;exactTerms={cse:exactTerms?}&amp;excludeTerms={cse:excludeTerms?}&amp;linkSite={cse:linkSite?}&amp;orTerms={cse:orTerms?}&amp;relatedSite={cse:relatedSite?}&amp;dateRestrict={cse:dateRestrict?}&amp;lowRange={cse:lowRange?}&amp;highRange={cse:highRange?}&amp;searchType={cse:searchType?}&amp;fileType={cse:fileType?}&amp;rights={cse:rights?}&amp;imgsz={cse:imgsz?}&amp;imgtype={cse:imgtype?}&amp;imgc={cse:imgc?}&amp;imgcolor={cse:imgcolor?}&amp;alt=atom"/>
<opensearch:Query role="request" title="Google Custom Search -  Albertus Magnus College.  library  Albertus Magnus College Library intitle:newsletter albertus.edu" totalResults="7" searchTerms=" Albertus Magnus College.  library  Albertus Magnus College Library intitle:newsletter albertus.edu" count="7" startIndex="1" inputEncoding="utf8" outputEncoding="utf8" cse:safe="off" cse:cx="008033228147187897025:-ua_scxr1uc"/>
<opensearch:totalResults>7</opensearch:totalResults>
<opensearch:startIndex>1</opensearch:startIndex>
<cse:context title="Library Website Search Engine"/>
<cse:searchInformation>
 <cse:searchTime>0.073074</cse:searchTime>
 <cse:formattedSearchTime>0.07</cse:formattedSearchTime>
 <cse:totalResults>7</cse:totalResults>
 <cse:formattedTotalResults>7</cse:formattedTotalResults>
</cse:searchInformation>
<cse:spelling>
 <cse:correctedQuery type="html"/>
</cse:spelling>
<entry gd:kind="customsearch#result">
 <id>http://www.albertus.edu/policy-reports/advancement-publications/documents/albertus-archive-october-2011-special-edition.pdf</id&gt;
 <updated>1970-01-16T11:10:30.455Z</updated>
 <title type="html">Special Edition Athletics @lbertus &lt;b&gt;Newsletter&lt;/b&gt;</title>
 <link href="http://www.albertus.edu/policy-reports/advancement-publications/documents/albertus-archive-october-2011-special-edition.pdf" title="www.albertus.edu"/>
 <summary type="html">This weekend marks a busy and historic time on campus for the &lt;b&gt;Albertus&lt;/b&gt;. &lt;br&gt;  &lt;b&gt;Magnus College&lt;/b&gt; Athletics Department as both the men&amp;#39;s and women&amp;#39;s soccer &lt;b&gt;...&lt;/b&gt;</summary>
 <cse:cacheId>AJGUZgC9CVMJ</cse:cacheId>
 <cse:mime>application/pdf</cse:mime>
 <cse:fileFormat>PDF/Adobe Acrobat</cse:fileFormat>
 <cse:formattedUrl type="html">www.&lt;b&gt;albertus.edu&lt;/b&gt;/.../&lt;b&gt;albertus&lt;/b&gt;-archive-october-2011-special-edition.pdf</cse:formattedUrl>
 <cse:PageMap>
  <cse:DataObject type="metatags">
   <cse:Attribute name="creationdate" value="D:20111118135759-05&apos;00&apos;"/>
   <cse:Attribute name="producer" value="Acrobat Web Capture 8.0"/>
   <cse:Attribute name="moddate" value="D:20111118140743-05&apos;00&apos;"/>
   <cse:Attribute name="title" value="Special Edition Athletics @lbertus Newsletter"/>
  </cse:DataObject>
 </cse:PageMap>
</entry>
...

</feed>


I'm using Generate Extract operator.  I've specified the namespaces as:
      <list key="namespaces">
         <parameter key="x" value="http://www.kbcafe.com/rss/atom.xsd.xml"/>
         <parameter key="xmlns:cse" value="http://schemas.google.com/cseapi/2010"/>
         <parameter key="xmlns:gd" value="http://schemas.google.com/g/2005"/>
         <parameter key="xmlns:opensearch" value="http://a9.com/-/spec/opensearch/1.1/"/>
         <parameter key="xx" value="xml"/>
       </list>

I've tried to extract xpath such as
//x:feed
//feed
and more specific - can't seem to match anyhting in ths feed.  I'm sure the problem is in my namespaces, but I don't know where to go to find the answer.

The targets I want to extract are
//x:feed/x:entry/x:title
and //x:feed/x:entry/x:link/@href.


Any help would be appreciated.

Answers

  • cindyharpercindyharper Member Posts: 9 Contributor II
    I've created a Google Custom Search Engine, and that allows capturing Google search results. But I'm stuck on the Google data and CSe schemas.  I can grab the pages, but I can't seem to extract xpaths form them.
  • MariusHelfMariusHelf RapidMiner Certified Expert, Member Posts: 1,869 Unicorn
    Hi,

    how are you trying to extract XPaths? Your current process setup and maybe some sample data would be useful to write a well-founded answer.

    Best,
    Marius
  • cindyharpercindyharper Member Posts: 9 Contributor II
    Here's my process 

    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <process version="5.2.003">
      <context>
        <input/>
        <output/>
        <macros/>
      </context>
      <operator activated="true" class="process" compatibility="5.2.003" expanded="true" name="Process">
        <parameter key="logverbosity" value="all"/>
        <parameter key="logfile" value="C:\Users\charper\Documents\ALiNBUS\gpagesextract.txt"/>
        <process expanded="true" height="424" width="493">
          <operator activated="true" class="retrieve" compatibility="5.2.003" expanded="true" height="60" name="Retrieve" width="90" x="45" y="30">
            <parameter key="repository_entry" value="//NewLocalRepository/ALinBus/GooglePages"/>
          </operator>
          <operator activated="true" class="select_attributes" compatibility="5.2.003" expanded="true" height="76" name="Select Attributes" width="90" x="98" y="107">
            <parameter key="attribute_filter_type" value="regular_expression"/>
            <parameter key="attribute" value="EntryXML"/>
            <parameter key="regular_expression" value="Entry.*|Link.*"/>
            <parameter key="invert_selection" value="true"/>
          </operator>
          <operator activated="true" class="replace" compatibility="5.2.003" expanded="true" height="76" name="Replace" width="90" x="112" y="165">
            <parameter key="attribute_filter_type" value="single"/>
            <parameter key="attribute" value="GooglePage"/>
            <parameter key="replace_what" value="xmlns.*\&gt;"/>
            <parameter key="replace_by" value="/&gt;"/>
          </operator>
          <operator activated="true" class="text:generate_extract" compatibility="5.2.001" expanded="true" height="60" name="Generate Extract" width="90" x="112" y="255">
            <parameter key="source_attribute" value="GooglePage"/>
            <parameter key="query_type" value="XPath"/>
            <list key="string_machting_queries"/>
            <list key="regular_expression_queries"/>
            <list key="regular_region_queries">
              <parameter key="EntryXML1" value="\\&lt;entry.\\&lt;\\/entry\\&gt;"/>
            </list>
            <list key="xpath_queries">
              <parameter key="LinkTitle1" value="//entry/text()"/>
            </list>
            <list key="namespaces">
              <parameter key="atom" value="file:///c/Users/charper/Documents/ALiNBUS/schema-cse-feed-local.xsd"/>
            </list>
            <parameter key="ignore_CDATA" value="false"/>
            <list key="index_queries"/>
          </operator>
          <operator activated="true" class="write_csv" compatibility="5.2.003" expanded="true" height="76" name="Write CSV" width="90" x="297" y="229"/>
          <connect from_op="Retrieve" from_port="output" to_op="Select Attributes" to_port="example set input"/>
          <connect from_op="Select Attributes" from_port="example set output" to_op="Replace" to_port="example set input"/>
          <connect from_op="Replace" from_port="example set output" to_op="Generate Extract" to_port="Example Set"/>
          <connect from_op="Generate Extract" from_port="Example Set" to_op="Write CSV" to_port="input"/>
          <connect from_op="Write CSV" from_port="through" to_port="result 1"/>
          <connect from_op="Write CSV" from_port="file" to_port="result 2"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="sink_result 1" spacing="0"/>
          <portSpacing port="sink_result 2" spacing="0"/>
          <portSpacing port="sink_result 3" spacing="0"/>
        </process>
      </operator>
    </process>


    My latest attempt was to try to take the import statements out of both the GooglePage attribute ( see Replace operator), and out of the .xsd.  So the xsd looks like this: 

    <?xml version="1.0" encoding="UTF-8"?>
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="file:///c/Users/charper/Documents/ALiNBUS/schema-cse-feed-local.xsd" />
      <xs:element name="feed">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="title"/>
            <xs:element ref="id"/>
            <xs:element ref="author"/>
            <xs:element ref="updated"/>
            <xs:element ref="opensearch:Url"/>
            <xs:element ref="opensearch:Query"/>
            <xs:element ref="opensearch:totalResults"/>
            <xs:element ref="opensearch:startIndex"/>
            <xs:element ref="cse:context"/>
            <xs:element ref="cse:searchInformation"/>
            <xs:element ref="cse:spelling"/>
            <xs:element ref="entry"/>
          </xs:sequence>
          <xs:attribute ref="gd:kind" use="required"/>
        </xs:complexType>
      </xs:element>
      <xs:element name="author">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="name"/>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="name" type="xs:string"/>
      <xs:element name="entry">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="id"/>
            <xs:element ref="updated"/>
            <xs:element ref="title"/>
            <xs:element ref="link"/>
            <xs:element ref="summary"/>
            <xs:element ref="cse:cacheId"/>
            <xs:element ref="cse:mime"/>
            <xs:element ref="cse:fileFormat"/>
            <xs:element ref="cse:formattedUrl"/>
            <xs:element ref="cse:PageMap"/>
          </xs:sequence>
          <xs:attribute ref="gd:kind" use="required"/>
        </xs:complexType>
      </xs:element>
      <xs:element name="link">
        <xs:complexType>
          <xs:attribute name="href" use="required" type="xs:anyURI"/>
          <xs:attribute name="title" use="required" type="xs:NCName"/>
        </xs:complexType>
      </xs:element>
      <xs:element name="summary">
        <xs:complexType mixed="true">
          <xs:attribute name="type" use="required" type="xs:NCName"/>
        </xs:complexType>
      </xs:element>
      <xs:element name="title">
        <xs:complexType mixed="true">
          <xs:attribute name="type" type="xs:NCName"/>
        </xs:complexType>
      </xs:element>
      <xs:element name="id" type="xs:anyURI"/>
      <xs:element name="updated" type="xs:dateTime"/>
    </xs:schema>
    I wasn't able to follow the import xsd links from the google output in my browser, so that's why I decided to try to dispense with them.

  • cindyharpercindyharper Member Posts: 9 Contributor II
    Maybe what I should ask is - can someone point me to the proper use of the namespaces parameter in the Generate Extract operator???
  • MariusHelfMariusHelf RapidMiner Certified Expert, Member Posts: 1,869 Unicorn
    Hi,

    please have a look at the attached process. The trick is to prepend //entry with "atom:" like this: //atom:entry and to define the atom prefix in the namespaces parameter exactly as it is written in the xml data.

    Best,
    Marius 
    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <process version="5.2.003">
      <context>
        <input/>
        <output/>
        <macros/>
      </context>
      <operator activated="true" class="process" compatibility="5.2.003" expanded="true" name="Process">
        <parameter key="logverbosity" value="all"/>
        <process expanded="true" height="536" width="705">
          <operator activated="false" class="retrieve" compatibility="5.2.003" expanded="true" height="60" name="Retrieve" width="90" x="45" y="30">
            <parameter key="repository_entry" value="//NewLocalRepository/ALinBus/GooglePages"/>
          </operator>
          <operator activated="true" class="text:create_document" compatibility="5.2.001" expanded="true" height="60" name="Create Document" width="90" x="45" y="165">
            <parameter key="text" value="&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;&#10;&lt;feed gd:kind=&quot;customsearch#search&quot; xmlns=&quot;http://www.w3.org/2005/Atom&quot; xmlns:cse=&quot;http://schemas.google.com/cseapi/2010&quot; xmlns:gd=&quot;http://schemas.google.com/g/2005&quot; xmlns:opensearch=&quot;http://a9.com/-/spec/opensearch/1.1/&quot;&gt;&#10; &lt;title&gt;Google Custom Search -  Albertus Magnus College.  library  Albertus Magnus College Library intitle:newsletter albertus.edu&lt;/title&gt;&#10; &lt;id&gt;tag:www.googleapis.com,2010-09-29:/customsearch/v1?q= Albertus Magnus College.  library  Albertus Magnus College Library intitle:newsletter albertus.edu&amp;amp;cx=008033228147187897025:-ua_scxr1uc&amp;amp;num=7&amp;amp;start=1&amp;amp;safe=off&lt;/id&gt;&#10; &lt;author&gt;&#10;  &lt;name&gt;Library Website Search Engine - Google Custom Search&lt;/name&gt;&#10; &lt;/author&gt;&#10; &lt;updated&gt;1970-01-16T11:10:30.455Z&lt;/updated&gt;&#10; &lt;opensearch:Url type=&quot;application/atom+xml&quot; template=&quot;https://www.googleapis.com/customsearch/v1?q={searchTerms}&amp;amp;num={count?}&amp;amp;start={startIndex?}&amp;amp;lr={language?}&amp;amp;safe={cse:safe?}&amp;amp;cx={cse:cx?}&amp;amp;cref={cse:cref?}&amp;amp;sort={cse:sort?}&amp;amp;filter={cse:filter?}&amp;amp;gl={cse:gl?}&amp;amp;cr={cse:cr?}}&amp;amp;googlehost={cse:googleHost?}&amp;amp;c2coff={?cse:disableCnTwTranslation}&amp;amp;hq={cse:hq?}&amp;amp;hl={cse:hl?}&amp;amp;siteSearch={cse:siteSearch?}&amp;amp;siteSearchFilter={cse:siteSearchFilter?}&amp;amp;exactTerms={cse:exactTerms?}&amp;amp;excludeTerms={cse:excludeTerms?}&amp;amp;linkSite={cse:linkSite?}&amp;amp;orTerms={cse:orTerms?}&amp;amp;relatedSite={cse:relatedSite?}&amp;amp;dateRestrict={cse:dateRestrict?}&amp;amp;lowRange={cse:lowRange?}&amp;amp;highRange={cse:highRange?}&amp;amp;searchType={cse:searchType?}&amp;amp;fileType={cse:fileType?}&amp;amp;rights={cse:rights?}&amp;amp;imgsz={cse:imgsz?}&amp;amp;imgtype={cse:imgtype?}&amp;amp;imgc={cse:imgc?}&amp;amp;imgcolor={cse:imgcolor?}&amp;amp;alt=atom&quot;/&gt;&#10; &lt;opensearch:Query role=&quot;request&quot; title=&quot;Google Custom Search -  Albertus Magnus College.  library  Albertus Magnus College Library intitle:newsletter albertus.edu&quot; totalResults=&quot;7&quot; searchTerms=&quot; Albertus Magnus College.  library  Albertus Magnus College Library intitle:newsletter albertus.edu&quot; count=&quot;7&quot; startIndex=&quot;1&quot; inputEncoding=&quot;utf8&quot; outputEncoding=&quot;utf8&quot; cse:safe=&quot;off&quot; cse:cx=&quot;008033228147187897025:-ua_scxr1uc&quot;/&gt;&#10; &lt;opensearch:totalResults&gt;7&lt;/opensearch:totalResults&gt;&#10; &lt;opensearch:startIndex&gt;1&lt;/opensearch:startIndex&gt;&#10; &lt;cse:context title=&quot;Library Website Search Engine&quot;/&gt;&#10; &lt;cse:searchInformation&gt;&#10;  &lt;cse:searchTime&gt;0.073074&lt;/cse:searchTime&gt;&#10;  &lt;cse:formattedSearchTime&gt;0.07&lt;/cse:formattedSearchTime&gt;&#10;  &lt;cse:totalResults&gt;7&lt;/cse:totalResults&gt;&#10;  &lt;cse:formattedTotalResults&gt;7&lt;/cse:formattedTotalResults&gt;&#10; &lt;/cse:searchInformation&gt;&#10; &lt;cse:spelling&gt;&#10;  &lt;cse:correctedQuery type=&quot;html&quot;/&gt;&#10; &lt;/cse:spelling&gt;&#10; &lt;entry gd:kind=&quot;customsearch#result&quot;&gt;&#10;  &lt;id&gt;http://www.albertus.edu/policy-reports/advancement-publications/documents/albertus-archive-october-2011-special-edition.pdf&lt;/id&gt;&#10;  &lt;updated&gt;1970-01-16T11:10:30.455Z&lt;/updated&gt;&#10;  &lt;title type=&quot;html&quot;&gt;Special Edition Athletics @lbertus &amp;lt;b&amp;gt;Newsletter&amp;lt;/b&amp;gt;&lt;/title&gt;&#10;  &lt;link href=&quot;http://www.albertus.edu/policy-reports/advancement-publications/documents/albertus-archive-october-2011-special-edition.pdf&quot; title=&quot;www.albertus.edu&quot;/&gt;&#10;  &lt;summary type=&quot;html&quot;&gt;This weekend marks a busy and historic time on campus for the &amp;lt;b&amp;gt;Albertus&amp;lt;/b&amp;gt;. &amp;lt;br&amp;gt;  &amp;lt;b&amp;gt;Magnus College&amp;lt;/b&amp;gt; Athletics Department as both the men&amp;amp;#39;s and women&amp;amp;#39;s soccer &amp;lt;b&amp;gt;...&amp;lt;/b&amp;gt;&lt;/summary&gt;&#10;  &lt;cse:cacheId&gt;AJGUZgC9CVMJ&lt;/cse:cacheId&gt;&#10;  &lt;cse:mime&gt;application/pdf&lt;/cse:mime&gt;&#10;  &lt;cse:fileFormat&gt;PDF/Adobe Acrobat&lt;/cse:fileFormat&gt;&#10;  &lt;cse:formattedUrl type=&quot;html&quot;&gt;www.&amp;lt;b&amp;gt;albertus.edu&amp;lt;/b&amp;gt;/.../&amp;lt;b&amp;gt;albertus&amp;lt;/b&amp;gt;-archive-october-2011-special-edition.pdf&lt;/cse:formattedUrl&gt;&#10;  &lt;cse:PageMap&gt;&#10;   &lt;cse:DataObject type=&quot;metatags&quot;&gt;&#10;    &lt;cse:Attribute name=&quot;creationdate&quot; value=&quot;D:20111118135759-05&amp;apos;00&amp;apos;&quot;/&gt;&#10;    &lt;cse:Attribute name=&quot;producer&quot; value=&quot;Acrobat Web Capture 8.0&quot;/&gt;&#10;    &lt;cse:Attribute name=&quot;moddate&quot; value=&quot;D:20111118140743-05&amp;apos;00&amp;apos;&quot;/&gt;&#10;    &lt;cse:Attribute name=&quot;title&quot; value=&quot;Special Edition Athletics @lbertus Newsletter&quot;/&gt;&#10;   &lt;/cse:DataObject&gt;&#10;  &lt;/cse:PageMap&gt;&#10; &lt;/entry&gt;&#10;&lt;/feed&gt;"/>
          </operator>
          <operator activated="true" class="text:documents_to_data" compatibility="5.2.001" expanded="true" height="76" name="Documents to Data" width="90" x="179" y="165">
            <parameter key="text_attribute" value="GooglePage"/>
          </operator>
          <operator activated="true" class="text_to_nominal" compatibility="5.2.003" expanded="true" height="76" name="Text to Nominal" width="90" x="303" y="164"/>
          <operator activated="false" class="select_attributes" compatibility="5.2.003" expanded="true" height="76" name="Select Attributes" width="90" x="180" y="30">
            <parameter key="attribute_filter_type" value="regular_expression"/>
            <parameter key="attribute" value="EntryXML"/>
            <parameter key="regular_expression" value="Entry.*|Link.*"/>
            <parameter key="invert_selection" value="true"/>
          </operator>
          <operator activated="false" class="replace" compatibility="5.2.003" expanded="true" height="76" name="Replace" width="90" x="313" y="30">
            <parameter key="attribute_filter_type" value="single"/>
            <parameter key="attribute" value="GooglePage"/>
            <parameter key="replace_what" value="xmlns.*\&gt;"/>
            <parameter key="replace_by" value="/&gt;"/>
          </operator>
          <operator activated="true" class="text:generate_extract" compatibility="5.2.001" expanded="true" height="60" name="Generate Extract" width="90" x="447" y="30">
            <parameter key="source_attribute" value="GooglePage"/>
            <parameter key="query_type" value="XPath"/>
            <list key="string_machting_queries"/>
            <list key="regular_expression_queries">
              <parameter key="x" value="&lt;entry&gt;(.*)&lt;/entry&gt;"/>
            </list>
            <list key="regular_region_queries">
              <parameter key="EntryXML1" value="\\&lt;entry.\\&lt;\\/entry\\&gt;"/>
            </list>
            <list key="xpath_queries">
              <parameter key="LinkTitle1" value="//atom:entry"/>
            </list>
            <list key="namespaces">
              <parameter key="atom" value="http://www.w3.org/2005/Atom"/>
            </list>
            <parameter key="ignore_CDATA" value="false"/>
            <parameter key="assume_html" value="false"/>
            <list key="index_queries"/>
          </operator>
          <operator activated="false" class="write_csv" compatibility="5.2.003" expanded="true" height="76" name="Write CSV" width="90" x="585" y="30"/>
          <connect from_op="Retrieve" from_port="output" to_op="Select Attributes" to_port="example set input"/>
          <connect from_op="Create Document" from_port="output" to_op="Documents to Data" to_port="documents 1"/>
          <connect from_op="Documents to Data" from_port="example set" to_op="Text to Nominal" to_port="example set input"/>
          <connect from_op="Text to Nominal" from_port="example set output" to_op="Generate Extract" to_port="Example Set"/>
          <connect from_op="Select Attributes" from_port="example set output" to_op="Replace" to_port="example set input"/>
          <connect from_op="Generate Extract" from_port="Example Set" to_port="result 1"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="sink_result 1" spacing="0"/>
          <portSpacing port="sink_result 2" spacing="0"/>
        </process>
      </operator>
    </process>
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