Attribute 'valueGroup' is not allowed to appear in element 'pattern'.

[dhildreth]

I'm getting a strange error when attempting to use TextPatternTagger. I'm hoping it's just something I'm doing wrong, but it seems like a strange one. My goal is to extract a thumbnail image for the page to display in search results. These images are identified by itemprop="image" followed by the URL source. I'd like to save to the field called thumbnail_url. I have it in my preParseHandlers section.

<tagger class="com.norconex.importer.handler.tagger.impl.TextPatternTagger" >
    <pattern field="thumbnail_url" valueGroup="1"><![CDATA[itemprop="image" src="(.*?)">]]></pattern>
</tagger>

A quick check of the config file shows me some errors about the TextPatternTagger:

derek@solr:/var/norconex-collector-http-2.7.1$ ./collector-http.sh --checkcfg  -c myredacteddomain-config.xml
INFO  [AbstractCrawlerConfig] Reference filter loaded: ExtensionReferenceFilter[onMatch=EXCLUDE,extensions=zip,gif,jpg,jpeg,png,caseSensitive=false]
ERROR (XML Validation) TextPatternTagger: cvc-complex-type.3.2.2: Attribute 'valueGroup' is not allowed to appear in element 'pattern'.
ERROR [XMLConfigurationUtil$LogErrorHandler] (XML Validation) TextPatternTagger: cvc-complex-type.3.2.2: Attribute 'valueGroup' is not allowed to appear in element 'pattern'.
INFO  [AbstractCollectorConfig] Configuration loaded: id=MySite Config HTTP Collector; logsDir=./myredacteddomain-output/logs; progressDir=./myredacteddomain-output/progress
There were 1 XML configuration error(s).

I'm referring to the documentation here: http://www.norconex.com/collectors/importer/latest/apidocs/com/norconex/importer/handler/tagger/impl/TextPatternTagger.html. What did I miss?

[dhildreth]

Oh, shucks... it's a version issue. I'm on version 2.7.1 and I need 2.8 in order to use groups.