+/**
+ * Returns the standard CQL context set URI.
+ */
+YAZ_EXPORT
+const char *cql_uri();
+
+/**
+ * Compares two CQL strings (for relations, operators, etc)
+ * (unfortunately defined as case-insensitive unlike XML etc)
+ */
+YAZ_EXPORT
+int cql_strcmp(const char *s1, const char *s2);
+
+/**
+ * Compares two CQL strings at most n bytes
+ * (unfortunately defined as case-insensitive unlike XML etc)
+ */
+YAZ_EXPORT
+int cql_strncmp(const char *s1, const char *s2, size_t n);
+