Diff of /src/query/sortseq.h [469c54] .. [f34994]

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--- a/src/query/sortseq.h
+++ b/src/query/sortseq.h
@@ -36,7 +36,7 @@
     }
     virtual ~DocSeqSorted() {}
     virtual bool canSort() {return true;}
-    virtual bool setSortSpec(DocSeqSortSpec &sortspec);
+    virtual bool setSortSpec(const DocSeqSortSpec &sortspec);
     virtual bool getDoc(int num, Rcl::Doc &doc, string *sh = 0);
     virtual int getResCnt() {return m_docsp.size();}
  private: