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Simple Music NFT implementation guidance and best practices

Below please find guidance and best practice articles for the Simple Music NFT standard by using the search function or by browsing the articles by category.

General guidance for NFT

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Bar codes of various lengths
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Canonical spellings for names
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Common language and script code combinations
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Communicating old currencies
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Communication of identifiers in DDEX messages
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Communication of percentages
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Date/time tags and Time Zone Designators
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Dealing with uncommon use cases
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Do DPIDs have hyphens?
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Field length and precision
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GDPR and UGC
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Handling 'odd' characters
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How many DPIDs Do I need?
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Identifying sound recordings and videos containing the same audio
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Java library's date bug for 2020
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Lengths of artist names
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Limitations of proprietary identifiers
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Locations of XSDs
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Malformed identifiers
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Multiple proprietary identification systems
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Namespace and file locations for the XSD for allowed value sets
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Order of XML attributes
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Origin and trustworthiness of MEAD and PIE information
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Parental advice labels
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PLine and CLine
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Preambles for XML-based DDEX messages
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Precision of numeric values in MWN
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Priorities for metadata items
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Special XML characters (and how to avoid &amp;)
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Time stamp for data accuracy
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Version compatibility
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Versioning Allowed Value Sets
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What can I do if I have data requirements not addressed by DDEX
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Who owns which rights?

Guidance on Releases, Resources and Works

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Classical Music – Genre vs Structure
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Communicating classical releases and resources
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Contents of a RIN message
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Creation dates
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Genres
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Identifiers for resources and releases and parties
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Instrumental music in ERN-3
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Keywords
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Metadata in different languages
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Opus and composer catalogue numbers
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Parental advice labels
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PLine and CLine
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Public domain works
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Resource types
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Subtitles in multiple languages
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Territorial variations in release descriptions
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Translating and transliterating titles
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Use of ISRCs as the primary database key
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Who owns which rights?

Guidance on Parties

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Guidance on Identifiers and Allowed Value Sets

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Allowed-value sets and UserDefinedValues
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Avoiding the use of proprietary Identifiers
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Bar codes of various lengths
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Can a release be identified by an ISRC?
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Communication of identifiers in DDEX messages
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Do DPIDs have hyphens?
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Excluded Territories and Worldwide
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How many DPIDs Do I need?
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Identifiers for resources and releases and parties
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Identifying chapters
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Identifying sound recordings and videos containing the same audio
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Limitations of proprietary identifiers
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Malformed identifiers
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Multiple CommercialModelTypes or UseTypes in one deal
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Multiple proprietary identification systems
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Opus and composer catalogue numbers
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Proprietary identifiers
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Referencing composites using ID and IDREF
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Specialising DDEX-Defined Values
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Territory codes using ISO 3166-1 or ISO 3166-3 or TIS
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Use of ISRCs as the primary database key
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User-defined values
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Worldwide

Guidance on Dates and Time

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Creation dates
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Date/time tags and Time Zone Designators
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Exclusive vs inclusive deals
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Java library's date bug for 2020
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Time stamp for data accuracy

Guidance on Choreography issues

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Acknowledgements and non-repudiation