SNOMED CT® Release Format 1 (RF1) Guide - ihtsdo

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102 | SNOMED CT Release Format 1 (RF1) Guide July 2012 Chapter 3 Release File Formats Currently, during a transitional period, there are two distinct Release Formats for SNOMED CT: • Release Format 2 (RF2): The new standard distribution format for SNOMED CT. This was developed in response to extensive feedback on its predecessor and will replace RF1 during 2012. • Release Format 1 (3.2) (RF1): The specification in which SNOMED CT has been provided since its first release in 2002. This format will be phased out, but support of applications that require RF1 format files will be available using a conversion application developed and supplied by the IHTSDO. The key enhancements in RF2 are: • More robust and consistent version representation; • Reference sets, provides a more easily extensible and maintainable replacement for RF1 subsets and crossmaps; • Use of an added hierarchy to represent metadata about the structure of SNOMED CT itself. Both Release Formats represent: • The components of SNOMED CT: • Concepts • Descriptions • Relationships • Additional derivatives that provide standard representations of : • Value-sets consisting of a specified set of concepts or relationships • Cross mapping tables to other codes and classifications. Both Release Formats are provided in: • Tab-delimited text files; • Represent character content in accordance with the Unicode UTF-8 specification; • Use SNOMED CT Identifiers as the permanent Identifier of released core components; • Support extensions to the International Release using namespaces allocated to licensees to denote the provenance of added components and to ensure Identifier uniqueness. 3.1. RF1 Compatibility and Conversion Tools In January 2012 the IHTSDO switched from the original Release Format (used for SNOMED CT distribution since 2002), to the more flexible and consistent Release Format 2 (RF2). This means that from that date onward the primary source data for the SNOMED CT International Release is maintained and distributed in the RF2 format. © 2002-2012 International Health Terminology Standards Development Organisation CVR #: 30363434
The IHTSDO recognizes that, while implementers will which to benefit from the features of the new format, there is inevitably a transitional period during which both format are in use. Therefore, the IHTSDO provides the following resources to support users whose system do not yet support SNOMED CT Release Format 2: • Release Format 1 files will continue to be included in the International Release for a limited period • These files are not the authoritative version of SNOMED CT but are generated from the authoritative RF2 data using a software utility developed for this purpose. • The resulting RF1 data retains the functionality of the original release data but does not support any of the features of RF2. While all the clinically relevant SNOMED CT hierarchies are identical in both releases, the additional "Metadata Hierarchy" added as part of the RF2 upgrade is not included in the RF1 converted data. In addition there are some cases where Identifiers of RF1 derivatives (Subsets and Cross Maps) differ from those used for the equivalent Reference Sets in RF2. These differences are an essential consequence of ensuring that the RF1 data produced by conversion from RF2 is fully compatibility with existing RF1 systems. • The RF2 to RF1 Conversion Tool used for generating the RF1 files is also available to all IHTSDO Members and Affiliate Licensees • The "RF2 Conversion Tool" is an open source, Java-based, software tool to facilitate the conversion of SNOMED CT files released in RF2 format into RF1 format. The tool provides both a command line utility and a Graphical User Interface (GUI) to facilitate configuration, progress tracking and the maintenance of additional data whenever it is not available as part of an RF2 release. • The limitations of RF2 to RF1 conversion (noted above) will also apply to conversion undertaken using this tool. To enable the conversion to be completed successfully in a way that retains and replaces Identifiers consistently for the RF1 environment a set of auxiliary files (the "RF1 Compatibility Package") is also required. The "RF2 to RF1 Conversion Tool" and the "RF1 Compatibility Package" are available for IHTSDO Members and Affiliates to download in the same way as the SNOMED CT International Release. Caution: These resources and tools are intended for use during a transitional period and should not be considered as a long term alternative to migration to support direct use of RF2 data within applications. As SNOMED CT continues to evolve more of the specific feature of RF2 will be used to add value to the terminology. Some of the added value delivered by RF2 is soon likely to be regarded as essential for effective solutions to user requirements. 3.2. Release Format 1 Release File Formats | 103 This section describes the file structures in which SNOMED Clinical Terms has been distributed since its initial release in 2002. These file structures, which are now referred to as Release Format 1 (RF1), are being replaced by Release Format 2 which offers a range of enhanced features to support effective implementation and maintenance. For more details of see the Release Format 2 specification. From 2012 RF2 will become the primary Release Format for SNOMED CT. The IHTSDO will provide an RF2 to RF1 conversion application for use by Members and Affiliates to support existing applications that depend on the RF1 during a transitional period. However, this conversions process cannot support many of the enhanced features of RF2 and for this reason implementer are recommended to migrate their applications to the newer format. © 2002-2012 International Health Terminology Standards Development Organisation CVR #: 30363434
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SNOMED CT ® Release Format 1 (RF1)
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Contents | 3 Release Format 1 - Det
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Chapter 1 Preface The purpose of th
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Table 3: Document Types Type Name a
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IHTSDO Glossary (DRAFT) • On line
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Chapter 2 Structure and Content Gui
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Figure 1: Multiple levels of granul
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Table 5: Example: Defining arthriti
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The full definitions of the concept
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Other components (i.e. Relationship
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2.1.2.2.1.3. Linking related Concep
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• Local content requirements that
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Consistent representation is a prer
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Figure 8: Abstract logical model of
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1. As originally stated: : • | Ha
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2.2.1.3.2.3.1. Supertype aspects of
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Figure 11: Example hierarchy with l
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Concept E F G H J K L M Note: Compr
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Concept M List of proximal primitiv
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Table 11: Non-redundant attribute v
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G. | Severe upper limb laceration |
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As a result of this limitation some
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2.2.1.4.3. Historical relationships
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2.2.2.1.1.2. Refinement attribute n
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2.2.2.1.4.3. Use of "unapproved att
Page 51 and 52: Interim recommendations 1. Wherever
Page 53 and 54: 2.2.2.3.1. Close-to-user expression
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Page 59 and 60: Figure 25: Alternative expressions
Page 61 and 62: Figure 27: Possible expressions of
Page 63 and 64: Figure 28: SCTID Short Format - App
Page 65 and 66: PartitionId 05 Description A Cross
Page 67 and 68: SctId 999999990989121104 2.3.2.9. T
Page 69 and 70: 2.3.3.2. Specification for Namespac
Page 71 and 72: 2.3.3.3.1.4. Procedures 2.3.3.3.1.4
Page 73 and 74: 1. Every Concept in an Extension:
Page 75 and 76: Table 17: Processing Transfers betw
Page 77 and 78: In May 2008, the HL7 Version 3 Stan
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Page 83 and 84: excision of left fallopian tube. No
Page 85 and 86: This existential restriction is lab
Page 87 and 88: • In order to generate the OWL ve
Page 89 and 90: • Though there are many candidate
Page 91 and 92: 2.3.7.2.2.1. Single byte encoding C
Page 93 and 94: 9 0 9 Table 29: The full array for
Page 95 and 96: else {document.getElementById("out"
Page 97 and 98: http://www.augustana.ab.ca/~mohrj/a
Page 99 and 100: version. It seems unwise to prevent
Page 101: Table DescDualKey Table ConcDualKey
Page 105 and 106: 3.2.2. Release Format 1 - Structure
Page 107 and 108: 3.2.3.2. Core Tables Data - Structu
Page 109 and 110: Data Fields InitialCapitalStatus De
Page 111 and 112: 3.2.4.1. Subset Mechanism - Structu
Page 113 and 114: Data Fields ContextId 3.2.4.2.2. Su
Page 115 and 116: Subset SNOMED CT Top Level Navigati
Page 117 and 118: • as a combination of codes; •
Page 119 and 120: Table 41: Cross Mapping Tables Cros
Page 121 and 122: Table 44: Cross Map Targets Table K
Page 123 and 124: The History Mechanism is also used
Page 125 and 126: In addition, the ReferencedId field
Page 127 and 128: Table Descriptions Descriptions Rel
Page 129 and 130: Table 49: Relationships depending o
Page 131 and 132: Table 51: Changes to Relationships
Page 133 and 134: Table 52: Changes to Relationships
Page 135 and 136: • The only Relationships that it
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Page 141 and 142: Value 6 10 11 Limited Moved elsewhe
Page 143 and 144: As new concepts are added to SNOMED
Page 145 and 146: Table 73: DescriptionStatus Values
Page 147 and 148: 3.2.9.2.2.4. InitialCapitalStatus T
Page 149 and 150: 3.2.9.3. relationships tables Each
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An integer value that expresses an
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3.2.9.4.1.2.4. SubsetType Table 95:
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A string that identifies a Context
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3.2.9.4.2.1.2. Data Fields Table 10
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• MemberStatus 3.2.9.4.2.3.1.1. S
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3.2.9.4.2.4.1.3. MemberStatus Table
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3.2.9.4.2.5.2. Data Fields Table 11
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3.2.9.4.2.7.1.1. SubsetId Table 124
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3.2.9.4.2.8.1.3. MemberStatus Table
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3.2.9.4.3. Subset Definition File P
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3.2.9.5.1.2.3. MapSetSchemeId Table
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This discussion of rules is include
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3.2.9.5.1.3.2.3. MapRule Table 151:
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3.2.9.5.1.4.2.3. TargetRule Table 1
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RELAT_NMS = column in the LOINC tab
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The value of the SNOMED CT / LOINC
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The SNOMED CT Relationships Table e
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LOINC Analyte Name(s) DESMETHYLAMIO
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LOINC Analyte Name(s) COMPLEMENT IC
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The information provided includes d
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3.2.9.6.4.1.2. ReleaseVersion Table
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Value 6 7 8 9 10 11 Note: Name Limi
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3.2.9.6.5.1.1. ComponentId Table 17
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Release Format 1 is represents a sn
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RF1 Descriptions Table Descriptions
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Table 177: Concepts Table Use of re
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Use of recommended additional indic
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Use of recommended additional indic
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Table 184: Cross Map Sets Table Use
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Keys Partition Size Type Field Name
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Table 192: Word Equivalents Table U
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3.2.10. The Stated relationships ta
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Figure 41: Overview of Cross Map Sc
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Table 197: Cross Maps Sets Table Ma
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Table 201: Cross Maps Sets Table Ma
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Table 205: Cross Map Sets Table Map
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If this approach is followed, there
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This approach allows a more consist
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1. A record may contain many record
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• Temporally related to the selec
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CONCEPTID 95333004 7119001 95336007
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CONCEPTID 109778006 109788007 15270
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CONCEPTID 417163006 417746004 12820
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CONCEPTID 102706005 1677001 9145400
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CONCEPTID 399023006 399154007 39905
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CONCEPTID 399306005 399239005 39937
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CONCEPTID 125086000 78678003 388393
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CONCEPTID 339008 47002008 128419007
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CONCEPTID 16817006 15367004 1580700
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CONCEPTID 14509009 39250009 8627300
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CONCEPTID 122868007 122465003 78817
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CONCEPTID 19207007 74923002 6639100
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CONCEPTID 54305003 84100007 3216600
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CONCEPTID 255496004 255499006 24646
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CONCEPTID 62834003 5668004 34810001
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CONCEPTID 53224005 4150005 74636004
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CONCEPTID 47538007 19359003 3011000
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3.2.13. Enumerated values Value 0 1
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Table and Field Subsets SubsetType
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3.3. Release Format 2 Update Guide
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• The Release Format should minim
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3.3.3.4. Backward compatibility The
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3.3.4.5. Field Ordering Records in
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externalised structures such as Ref
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ContextId If either the RealmId fie
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eplaced by more descriptive ones if
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descriptions associated with concep
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Figure 45: Illustration of module d
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was inactivated. Each Reference ind
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Finally, add members to the Referen
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3.4.1. File Naming Convention - Ove
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• Test/Beta Release File("xsct",
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In certain cases, an RF1 data file
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VersionDate refers to the official,
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Example: Excluding the Fully Specif
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4.2.1.3. Pre-processing of distribu
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• Reject, highlight or apply othe
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Table 236: Essential concept Identi
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The purpose of this section of the
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Table 240: Example results for a Se
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• For each dual key, add rows to
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• Description104951019 is elimina
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4.4.1.4.1. Avoiding multiple hits o
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Table 248: Relationship Example Con
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• Since the depth of the hierarch
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4.4.2.5. Using navigation Subsets t
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Table 253: Concepts used in the Exa
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SubsetId Mem
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• 302402006 | radius and/or ulna
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Now we have tree nodes and their ch
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Subsets may be used to derive table
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• One Subset can be used as the b
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• A Context Concept Subset only r
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• A Navigation Subset specifies a
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• A RealmID identifies the specia
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4.5. Testing and traversing subtype
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This approach removes the need for
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4.5.5.2.4. Using the transitive clo
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Figure 55: Terminology server provi
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A field in the Component History Ta
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Cross maps table A data table consi
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• References Table Inactive compo
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A field in the Cross Maps Table tha
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A Subset that specifies sets of Nav
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A field in the Concepts Table that
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TargetId A SNOMED CT Identifier tha
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WordText A field in the Word Equiva
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