How is a manufacturing split shown in the correspondence table?

A manufacturing split is shown in a correspondence table as one old class row pointing to two or more new class rows, or as a block of old rows pointing to a block of new rows. The illustration in this guide uses class 16.29, whose split into three classes is stated in paragraph 141, to show the structure of the table. The illustration is a statement about table structure, not a guarantee of a mapping, and it does not determine a code for a specific reader.

What does the table record for a split?

The correspondence table records scopes, not decisions. For a clean split, the table shows the old class in the source column and the new classes in the target column, with the joint scope of the new classes equal to the scope of the old class. The manual calls that pattern a one to many correspondence, and paragraph 207 records 11 Rev. 2 classes with that pattern across the whole classification. For a rearranged split, the table shows a block of old classes and a block of new classes whose joint scopes are identical, which the manual calls a many to many correspondence, with 225 Rev. 2 classes in that pattern. The manufacturing splits in this cluster must be checked against the table to see which pattern applies to each old class, because section 4 does not state the pattern for every split.

The table also records the reverse direction. Paragraph 206 states that complete detailed correspondences between NACE Rev. 2 and NACE Rev. 2.1, and vice versa, are available online. The reverse table shows the new classes in the source column and the old classes in the target column. The reverse reading is not the mirror image of the forward reading for a split: a new class in the reverse table points back to the old class it came from, together with any other old classes that contributed content to it, where the pattern is many to many. A reader who reads only the forward table will miss the contributions recorded in the reverse table, and a reader who reads only the reverse table will miss the split recorded in the forward table.

How is the 16.29 illustration laid out?

The illustration below shows the structure of a one to many entry, using the three classes from paragraph 141. It is labelled as an illustration of structure, because the correspondence type for class 16.29 must be confirmed in the table itself, and this guide does not assert the type from section 4 alone. The illustration shows the form the entry takes if the table records a clean split. If the table records a many to many pattern for the class, the entry will show additional source and target rows, and the illustration must be read as a simplified form, not as the full entry.

The illustration also shows why the explanatory notes must be read with the table. The table states that three new classes exist. It does not state what each new class includes and excludes. The notes for classes 16.26, 16.27 and 16.28 state the inclusions and exclusions, as summarised in the separate guides for those classes. A reader who has only the table knows that a split occurred. A reader who has the table and the notes knows what the split separated, and can state in general terms which new scope contains an activity, subject to confirmation by the institute or register for a specific unit.

What does the illustration show, and what does it not show?

| Row | Source, NACE Rev. 2 | Target, NACE Rev. 2.1 |

|---|---|---|

| Illustration row 1 | 16.29, manufacture of other products of wood, articles of cork, straw and plaiting materials | 16.26, manufacture of solid fuels from vegetable biomass |

| Illustration row 2 | 16.29, as above | 16.27, finishing of wooden products |

| Illustration row 3 | 16.29, as above | 16.28, manufacture of other products of wood and articles of cork, straw and plaiting materials |

The table is labelled as an illustration of structure in the text above, and the label applies to every row. The source and target titles are the titles in the manual, and the three target classes are the three classes in paragraph 141. The table does not show a correspondence type, a version number, or a determination for a specific unit, because none of those is stated by the illustration. The version cited in the manual for the correspondence types is version 1.05, in paragraph 207, and the current table must be consulted through the Eurostat correspondence tables page for the entry as it stands.

What does a split not decide?

This cluster states no one to one mapping for a split class, since a split cannot, by definition, be one to one. A split correspondence type is one to many for a clean split recorded in the manual, or many to many where content has been rearranged across several categories. Both cases have joint scopes in the table, and both require the note for each new class to be read. The national statistical institute or business register holding the record confirms the entry held for a specific unit, not this guide.

Where is a split class confirmed?

The checks for a manufacturing split are the explanatory notes of the new classes, the correspondence table entry for the old class, and confirmation of the entry for the unit concerned from the national statistical institute or business register holding the record.

Use the 16.29 rows as a picture of table structure, check the live table for the type and the full entry, and confirm the entry with the institute or register that holds it.