pub fn sp3_content_start_convention(
center: AnalysisCenter,
date: ProductDate,
issue: Option<&str>,
) -> Result<Sp3ContentStartConvention, DataCatalogError>Expand description
Return the official content-start convention for one cataloged SP3 product.
issue follows the same rules as product: it is required for
ultra-rapid centers, must be one of that center’s published issues, and must
be absent for product lines without issue times. Sampling cadence is not an
input because the cataloged content-start convention is shared by every
supported cadence of the same product issue.