Issue link: https://iconnect007.uberflip.com/i/1166358
SEPTEMBER 2019 I PCB007 MAGAZINE 63 • In IEC 62474, a revision is made whenever any change in the substance (or data ex- change part) of the database occurs with major revisions as the integer (to the left of the decimal point) and minor revisions to the right of the decimal point. The dates that given entries have been modified is contained within the database per speci- fied substance because not everything changes with every update. The identity remains the IEC 62474 substance list and does not change with updates; this is a simpler approach Figures 10–12 illustrate those differences with structures of IPC-7152, IEC 62474, and IPC-1754 DSL. The next phase of con- vergence would include the following goals: • Harmonized principles and use cases are shared for the common body by the standards • A unique data structure and a unique correspond- ing schema (XML schema definition, or XSD) are established for the common body that means full interoperability between the existing standards; each standard may add their specific features on top of the com- mon body—see previous options for the scope of this common body • A unique substances and substance groups/categories list structure and a unique corresponding schema are estab- lished for any lists authored by any orga- nization; this includes regulatory lists by governments. That means all standards are capable to work with the same RSL/ DSL provided in a unique XML schema Figure 11: IEC 62474 Edition 1 Declarable Substance List schema. Figure 12: IPC-1754 Declarable Substance List schema.