Memory leak of tokenizers in simple store

<b>MLK</b> ==3689== 2,032 (48 direct, 1,984 indirect) bytes in 1 blocks are definitely lost in loss record 13 of 13
==3689== at 0x4C27CC1: operator new(unsigned long) (vg_replace_malloc.c:261)
==3689== by 0x5A1081A: zorba::ICU_TokenizerProvider::getTokenizer(zorba::locale::iso639_1::type, zorba::Tokenizer::Numbers&amp;) const (icu_tokenizer.cpp:412)
==3689== by 0x5F11001: zorba::simplestore::XmlNodeTokenizerCallback::push_lang(zorba::locale::iso639_1::type) (node_items.cpp:4666)
==3689== by 0x5F11E7A: zorba::simplestore::XmlNodeTokenizerCallback::XmlNodeTokenizerCallback(zorba::TokenizerProvider const&amp;, zorba::Tokenizer::Numbers&amp;, zorba::locale::iso639_1::type, zorba::FTTokenStore&amp;) (node_items.cpp:4622)
==3689== by 0x5F11FD0: zorba::simplestore::XmlNode::getTokens(zorba::TokenizerProvider const&amp;, zorba::Tokenizer::Numbers&amp;, zorba::locale::iso639_1::type, bool) const (node_items.cpp:4842)
==3689== by 0x5A0C9A9: zorba::FTContainsIterator::nextImpl(zorba::store::ItemHandle&lt;zorba::store::Item&gt;&amp;, zorba::PlanState&amp;) const (full_text_impl.cpp:90)
==3689== by 0x5846103: zorba::PlanIterator::consumeNext(zorba::store::ItemHandle&lt;zorba::store::Item&gt;&amp;, zorba::PlanIterator const*, zorba::PlanState&amp;) (plan_iterator.cpp:124)
==3689== by 0x5844F0F: zorba::PlanWrapper::next(zorba::store::ItemHandle&lt;zorba::store::Item&gt;&amp;) (plan_wrapper.cpp:149)
==3689== by 0x50C4D2E: zorba::serializer::serialize(zorba::rchandle&lt;zorba::store::Iterator&gt;, std::ostream&amp;, zorba::SAX2_ContentHandler*) (serializer.cpp:2303)
==3689== by 0x50C5314: zorba::serializer::serialize(zorba::rchandle&lt;zorba::store::Iterator&gt;, std::ostream&amp;) (serializer.cpp:2261)
==3689== by 0x507362A: zorba::XQueryImpl::serialize(std::ostream&amp;, zorba::rchandle&lt;zorba::PlanWrapper&gt;&amp;, Zorba_SerializerOptions const*) (xqueryimpl.cpp:1291)
==3689== by 0x5073799: zorba::XQueryImpl::execute(std::ostream&amp;, Zorba_SerializerOptions const*) (xqueryimpl.cpp:1117)
==3689== by 0x408183: main (testdriver.cpp:435)