Thanks for having analyzed the problem. But please let me note that I came to a
somehow different conclusion.
Define for the moment "title" to be the primary unique key:
solr-4.3.0\example\example-DIH\solr\rss\conf\schema.xml
<uniqueKey>title</uniqueKey>
solr-4.3.0\example\example-DIH\solr\rss\conf\rss-data-config.xml
[BAD CASE] (irrespective of the predicate @rel='self')
<dataConfig>
<dataSource type="URLDataSource" />
<document>
<entity name="beautybooks88 " pk="title"
url="http://beautybooks88.blogspot.com/feeds/posts/default";
processor="XPathEntityProcessor" forEach="/feed/entry"
transformer="DateFormatTransformer">
<field column="title" xpath="/feed/entry/title" />
<field column="source-link" xpath="/feed/link[@rel='self']/@href"
commonField="true" />
</entity>
</document>
</dataConfig>
[GOOD CASE]
<dataConfig>
<dataSource type="URLDataSource" />
<document>
<entity name="beautybooks88 " pk="title"
url="http://beautybooks88.blogspot.com/feeds/posts/default";
processor="XPathEntityProcessor" forEach="/feed/entry"
transformer="DateFormatTransformer">
<field column="title" xpath="/feed/entry/title" />
<field column="link" xpath="/feed/entry/link[@rel='self']/@href" />
</entity>
</document>
</dataConfig>
Conclusion: It has nothing to do with the number of occurrences of the pattern.
