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62 PCB007 MAGAZINE I SEPTEMBER 2019 Some differences still exist between IEC 62474, IPC-1752 and IPC-1754: • IEC 62474 edition 1 does not include sec- tionals and sub-sectionals statements, while it exists in IPC-175x series and eases data quality check; for instance, Figure 9 shows an IPC-1752 declaration, including classes A and D plus manufacturing infor- mation • IPC-175x series provides two levels of sec- tionals and sub-sectionals for IPC-175x standard to structure their declarations • DSL structures and schemas are different: – IEC 62474 Edition 1 does not define a structured schema for the list provided in XML as a flat list of elements to be either an individual substance or a substance group – IPC-1752 DSL includes one single "substance category" element used for both an individual substance (with a unique ID, but neither CAS number nor EC number) and a substance group/ category – IPC-1754 DSL includes one single substance element with a name and a CAS number for both individual substance and substance group; but no capability to expand the group with a list of their substances; considering coming AD-DSL 3.0 with such information, the IPC-1754 DSL schema would need to be extended to the same capability than the IEC 62474 and harmonized with IPC-1752 revision B – IEC includes two elements: one "specific substance" element for individual substances with their CA number and one "substance group" element for substances group or family; reference substances are an informative list of substances within a substance group to help the organi- zation to determine what they need to declare when a given government substance restriction regulation references only a group of substances (i.e., substance group) • IPC-1752 and IPC-1754 provide a "unique ID extended" element (identity, author- ity, revision, and date) to their lists while no such unique ID is provided by the IEC 62474 Edition 1—only a revision is provid- ed, and the current is "D16.00" Figure 9: IPC-175x sectionals and sub-sectionals. Figure 10: IPC-1752A Amendment 3 Declarable Substance List schema.