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---++Complexity of DELTA

---+++Introduction

The proposed BDI.SDD_ schema has significant complexity and we believe that the complexity is necessary to store high quality data. However, we have taken great care to allow relatively simple BDI.SDD_ documents to be created. The [[PrimerHome][BDI.SDD_ primer]] explains the basics of using BDI.SDD_. 

A frequent argument we encounter is that BDI.SDD_ is more complex and difficult than DELTA. For a number of reasons we do not think this is true. One problem when comparing the complexity of <a href="http://biodiversity.bio.uno.edu/delta/">DELTA</a> and BDI.SDD_ is that the complexity of DELTA itself is difficult to assess. DELTA has a few basic directives, namely Character Type, Character List, and Item Descriptions that are minimally sufficient to start describing items. Character List, and Item Descriptions are, however, highly structured and map to several BDI.SDD_ elements.

To allow some degree of comparison I have prepared a list of DELTA directives based on the information in the latest version of the "User's Guide to the DELTA System" (Edition 4.12 by M.&nbsp;J. Dallwitz, T.&nbsp;A. Paine, and E.&nbsp;J. Zurcher, 2000). Since DELTA is originally a command-driven language, some directives contain data, whereas other directives give commands to execute methods in a specific program. The distinction is, however, weak. Many reporting directives (!*Omit Inner Comments, !*Omit Lower For Characters) are required when creating natural language descriptions or keys, and some commands (e.&nbsp;g. or *Insert Implicit Values) have to be executed to obtain meaningful data. Still other "commands" like !*Input File provide the basic functionality to find the files belonging to a project. No other program will be able to create natural language descriptions or keys without evaluating these "command"-like directives.

---+++Overview of DELTA directives

In the list below I have attempted to mark all [[DeltaDirectives][directives]] that are informative only in the context of using the CSIRO DELTA programs in gray and those that contain valuable descriptive or terminological definitions in bold face. Directives considered obsolete or deprecated by DELTA (e.&nbsp;g. !*State Codes) are marked gray as well.

<p class="small"><b>*Absolute Error</b>, <span style="color:gray">*Accept Duplicate Values</span>, <b>*Add Characters</b><!--(Note: = item specific Include Characters directive, not supported by BDI.SDD_!)-->, <b>*Alternate Comma</b>, <b>*Applicable Characters</b>, <b>*Character For Output Files</b>, <b>*Character Descriptions<!-- syn. of Char List, used by Pankey --></b>, <b>*Characters For Synonymy</b>, <b>*Character For Taxon Images</b>, <b>*Character For Taxon Names</b>, <b>*Character Headings</b>, <b>*Character Images</b>, <b>*Character Keyword Images</b>, <b>*Character List</b>, <b>*Character Notes</b>, <b>*Character Reliabilities</b>, <b>*Character Types</b>, <b>*Character Weights</b>, <b>*Chinese Format</b>, <b>*Comment</b>, <span style="color:gray">*Data Buffer Size</span>, <span style="color:gray">*Data Compression</span>, <span style="color:gray">*Data Listing</span>, <b>*Decimal Places</b>, <b>*Dependent Characters</b>, <span style="color:gray">*Disable Delta Output</span>, <span style="color:gray">*Dist Output File</span>, <b>*Emphasize Characters</b>, <b>*Emphasize Features</b>, <span style="color:gray">*End</span>, <span style="color:gray">*Error File</span>, <b>*Exclude Characters</b>, <b>*Exclude Items</b>, <b>*Heading</b>, <b>*Image Directory</b>, <b>*Implicit Values</b>, <b>*Inapplicable Characters</b>, <b>*Include Characters</b>, <b>*Include Items</b>, <span style="color:gray">*Index Headings</span>, <span style="color:gray">*Index Output File</span>, <span style="color:gray">*Index Text</span>, <span style="color:gray">*Input Delta File</span>, <span style="color:gray">*Input File</span>, <span style="color:gray">*Insert Character Sequence Numbers</span>, <span style="color:gray">*Insert Image File Name</span>, *Insert Implicit Values, <span style="color:gray">*Insert Item Sequence Numbers</span>, <span style="color:gray">*Insert Redundant Variant Attributes</span><!-- convert Variant taxa into full descriptions -->, <span style="color:gray">*Intkey Output File</span>, <b>*Item Abundances</b>, <b>*Item Descriptions</b>, <b>*Item Headings</b>, <span style="color:gray">*Item Output Files</span>, <b>*Item Subheadings</b>, <b>*Item Weights</b>, <b>*Key Character List</b>, <span style="color:gray">*Key Output File</span>, <b>*Key States</b>, <b>*Link Characters</b>, <span style="color:gray">*List Characters</span>, <span style="color:gray">*List Heading</span>, <span style="color:gray">*List Items</span>, <span style="color:gray">*Listing File</span>, <b>*Mandatory Characters</b>, <span style="color:gray">*Maximum Number Of Items</span>, <span style="color:gray">*Maximum Number Of States</span>, <b>*New Files At Items</b>, <span style="color:gray">*New Listing Page</span>, <b>*New Paragraphs At Characters</b>, <span style="color:gray">*New Print Page</span>, <span style="color:gray">*No Data Listing</span>, <b>*Nonautomatic Controlling Characters</b><!-- related to character dependency -->, <span style="color:gray">*Number Of Characters</span>, <span style="color:gray">*Number States From Zero</span>, <span style="color:gray">*Numbers Of States</span>, <span style="color:gray">*Omit Character Numbers</span>, <span style="color:gray">*Omit Comments</span>, <b>*Omit Final Comma</b>, <b>*Omit Inapplicables</b>, <b>*Omit Inner Comments</b>, <b>*Omit Lower For Characters</b>, <b>*Omit Or For Characters</b>, <b>*Omit Period For Characters</b>, <span style="color:gray">*Omit Redundant Variant Attributes</span><!-- reduce descriptions of Variant taxa to include only difference to parent -->, <b>*Omit Space Before Units</b>, <span style="color:gray">*Omit Typesetting Marks</span>, <span style="color:gray">*Output Directory</span>, <span style="color:gray">*Output File</span>, <span style="color:gray">*Output Format Html</span>, <span style="color:gray">*Output Parameters</span>, <span style="color:gray">*Output Width</span>, <span style="color:gray">*Overlay Fonts</span>, <span style="color:gray">*Page Length</span>, <b>*Percent Error</b>, <span style="color:gray">*Previous Input File</span>, <span style="color:gray">*Print All Characters</span>, <span style="color:gray">*Print Character List</span>, <span style="color:gray">*Print Comment</span>, <span style="color:gray">*Print File</span>, <span style="color:gray">*Print Heading</span>, <span style="color:gray">*Print Item Descriptions</span>, <span style="color:gray">*Print Item Names</span>, <span style="color:gray">*Print Summary</span>, <span style="color:gray">*Print Uncoded Characters</span>, <span style="color:gray">*Print Width</span>, <b>*Registration Heading<!-- obsolete synonym of Heading --></b>, <b>*Registration Subheading<!-- the only place where one can define a project version or date! Still in use! --></b>, <span style="color:gray">*Registration Validation</span>, <span style="color:gray">*Replace Angle Brackets</span>, <b>*Replace Semicolon By Comma</b>, <span style="color:gray">*Replace State Codes</span>, <b>*Scale Characters</b>, <span style="color:gray">*Sequence Increment</span>, <span style="color:gray">*Show</span>, <span style="color:gray">*Sort States</span>, <span style="color:gray">*Special Storage</span>, <b>*Startup Images</b>, <span style="color:gray">*State Codes</span>, <span style="color:gray">*Stop After Item</span>, <span style="color:gray">*Subject For Output Files</span>, <b>*Taxon Images</b>, <b>*Taxon Keyword Images</b>, <b>*Taxon Links</b><!-- = full text document resources for taxa, e.g. species pages-->, <span style="color:gray">*Translate Implicit Values</span>, <span style="color:gray">*Translate Into</span>, <span style="color:gray">*Translate Uncoded Characters</span>, <span style="color:gray">*Treat Integer As Real</span>, <span style="color:gray">*Treat Unknown As Variable</span>, <span style="color:gray">*Treat Variable As Unknown</span>, <span style="color:gray">*Typesetting Marks</span>, <b>*Use Controlling Characters First</b>, <span style="color:gray">*Use Mean Values</span>, <span style="color:gray">*Use Last Value Coded</span>, <span style="color:gray">*Use Normal Values</span>, <b>*Vocabulary</b>, <strong>[Delfor:]</strong> *Control Phrases, <span style="color:gray">*New Character Order</span>, <span style="color:gray">*New Line For Attributes</span>, <span style="color:gray">*New State Orders</span>, <span style="color:gray">*Reformat</span>, <strong>[Key:]</strong> <span style="color:gray">*Abase</span>, <span style="color:gray">*Add Character Numbers</span>, <span style="color:gray">*Allow Improper Subgroups</span>, <span style="color:gray">*Characters File</span>, <span style="color:gray">*Dump</span>, <span style="color:gray">*Input File</span>, <span style="color:gray">*Items File</span>, <span style="color:gray">*Key Output File</span>, <span style="color:gray">*Key Typesetting File</span>, <span style="color:gray">*Matrix Dump</span>, <span style="color:gray">*No Bracketted Key</span>, <span style="color:gray">*No Tabular Key</span>, <span style="color:gray">*Number Of Confirmatory Characters</span>, <span style="color:gray">*Preset Characters</span>, <span style="color:gray">*Rbase</span>, <span style="color:gray">*Reuse</span>, <span style="color:gray">*Stop After Column</span>, <span style="color:gray">*Storage Factor</span>, <span style="color:gray">*Treat Characters As Variable</span>, <span style="color:gray">*Treat Unknown As Inapplicable</span>, <span style="color:gray">*Truncate Tabular Key At</span>, <span style="color:gray">*Typesetting Marks</span>, <span style="color:gray">*Varywt</span>, <strong>[Dist:]</strong> <span style="color:gray">*Items File</span>, <span style="color:gray">*Log</span>, <span style="color:gray">*Match Overlap</span>, <span style="color:gray">*Maximum Items In Memory</span>, <span style="color:gray">*Minimum Number Of Comparisons</span>, <span style="color:gray">*Names File</span>, <span style="color:gray">*Phylip Format</span> <strong>[Intkey:]</strong> Define Characters "keyword c1 c2 ...", Define Taxa "keyword t1 t2 ...", Define Names "keyword n1, n2, ...".</p>

Note 1: The Intkey directives at the end are normally considered Intkey command line commands rather than DELTA directives. However, the three listed provide essential functionality for DELTA. Otherwise the list of Intkey commands is incomplete, ca. 70 further Intkey commands exist. <b>*Define Characters</b> is used to define character groups for interactive identification in Intkey (and is also supported by DeltaAccess).

Note 2: DELTA directives must be all-uppercase. here they have been written in normal capitalization to improve readability.

The markup above is a personal estimate and other consumers of DELTA data may want to use other directives. However, the list of directives shown in boldface shows that DELTA as a fully usable system is quite complex as well, and necessarily so if all of interactive keys, guided key generation, and natural language descriptions shall be supported.

Furthermore, a comparison between DELTA and BDI.SDD_ should consider not only the old DELTA standard, but also the considerably more complex proposal for a new DELTA (M.&nbsp;J. Dallwitz, T.&nbsp;A. Paine, and E.&nbsp;J. Zurcher (1993 onwards, <a href="http://biodiversity.uno.edu/delta/www/proposal.htm">1999</a>, <a href="http://delta-intkey.com/www/proposal.htm">2005</a>) Proposed New Features for the DELTA System). BDI.SDD_ does address most of the issues raised in the DELTA II proposal.

*See also the overview [[DELTAandBDI.SDD][DELTA and BDI.SDD_]].*

-- Main.GregorHagedorn - 10 May 2006 (First version published outside of Wiki by Gregor Hagedorn on 20. November 2003)


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The proposed BDI.SDD schema has significant complexity and we believe that the complexity is necessary to store high quality data. However, we have taken great care to allow relatively simple BDI.SDD documents to be created. The [[PrimerHome][BDI.SDD primer]] explains the basics of using BDI.SDD. 
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A frequent argument we encounter is that BDI.SDD is more complex and difficult than DELTA. For a number of reasons we do not think this is true. One problem when comparing the complexity of <a href="http://biodiversity.bio.uno.edu/delta/">DELTA</a> and BDI.SDD is that the complexity of DELTA itself is difficult to assess. DELTA has a few basic directives, namely Character Type, Character List, and Item Descriptions that are minimally sufficient to start describing items. Character List, and Item Descriptions are, however, highly structured and map to several BDI.SDD elements.
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<p class="small"><b>*Absolute Error</b>, <span style="color:gray">*Accept Duplicate Values</span>, <b>*Add Characters</b><!--(Note: = item specific Include Characters directive, not supported by BDI.SDD!)-->, <b>*Alternate Comma</b>, <b>*Applicable Characters</b>, <b>*Character For Output Files</b>, <b>*Character Descriptions<!-- syn. of Char List, used by Pankey --></b>, <b>*Characters For Synonymy</b>, <b>*Character For Taxon Images</b>, <b>*Character For Taxon Names</b>, <b>*Character Headings</b>, <b>*Character Images</b>, <b>*Character Keyword Images</b>, <b>*Character List</b>, <b>*Character Notes</b>, <b>*Character Reliabilities</b>, <b>*Character Types</b>, <b>*Character Weights</b>, <b>*Chinese Format</b>, <b>*Comment</b>, <span style="color:gray">*Data Buffer Size</span>, <span style="color:gray">*Data Compression</span>, <span style="color:gray">*Data Listing</span>, <b>*Decimal Places</b>, <b>*Dependent Characters</b>, <span style="color:gray">*Disable Delta Output</span>, <span style="color:gray">*Dist Output File</span>, <b>*Emphasize Characters</b>, <b>*Emphasize Features</b>, <span style="color:gray">*End</span>, <span style="color:gray">*Error File</span>, <b>*Exclude Characters</b>, <b>*Exclude Items</b>, <b>*Heading</b>, <b>*Image Directory</b>, <b>*Implicit Values</b>, <b>*Inapplicable Characters</b>, <b>*Include Characters</b>, <b>*Include Items</b>, <span style="color:gray">*Index Headings</span>, <span style="color:gray">*Index Output File</span>, <span style="color:gray">*Index Text</span>, <span style="color:gray">*Input Delta File</span>, <span style="color:gray">*Input File</span>, <span style="color:gray">*Insert Character Sequence Numbers</span>, <span style="color:gray">*Insert Image File Name</span>, *Insert Implicit Values, <span style="color:gray">*Insert Item Sequence Numbers</span>, <span style="color:gray">*Insert Redundant Variant Attributes</span><!-- convert Variant taxa into full descriptions -->, <span style="color:gray">*Intkey Output File</span>, <b>*Item Abundances</b>, <b>*Item Descriptions</b>, <b>*Item Headings</b>, <span style="color:gray">*Item Output Files</span>, <b>*Item Subheadings</b>, <b>*Item Weights</b>, <b>*Key Character List</b>, <span style="color:gray">*Key Output File</span>, <b>*Key States</b>, <b>*Link Characters</b>, <span style="color:gray">*List Characters</span>, <span style="color:gray">*List Heading</span>, <span style="color:gray">*List Items</span>, <span style="color:gray">*Listing File</span>, <b>*Mandatory Characters</b>, <span style="color:gray">*Maximum Number Of Items</span>, <span style="color:gray">*Maximum Number Of States</span>, <b>*New Files At Items</b>, <span style="color:gray">*New Listing Page</span>, <b>*New Paragraphs At Characters</b>, <span style="color:gray">*New Print Page</span>, <span style="color:gray">*No Data Listing</span>, <b>*Nonautomatic Controlling Characters</b><!-- related to character dependency -->, <span style="color:gray">*Number Of Characters</span>, <span style="color:gray">*Number States From Zero</span>, <span style="color:gray">*Numbers Of States</span>, <span style="color:gray">*Omit Character Numbers</span>, <span style="color:gray">*Omit Comments</span>, <b>*Omit Final Comma</b>, <b>*Omit Inapplicables</b>, <b>*Omit Inner Comments</b>, <b>*Omit Lower For Characters</b>, <b>*Omit Or For Characters</b>, <b>*Omit Period For Characters</b>, <span style="color:gray">*Omit Redundant Variant Attributes</span><!-- reduce descriptions of Variant taxa to include only difference to parent -->, <b>*Omit Space Before Units</b>, <span style="color:gray">*Omit Typesetting Marks</span>, <span style="color:gray">*Output Directory</span>, <span style="color:gray">*Output File</span>, <span style="color:gray">*Output Format Html</span>, <span style="color:gray">*Output Parameters</span>, <span style="color:gray">*Output Width</span>, <span style="color:gray">*Overlay Fonts</span>, <span style="color:gray">*Page Length</span>, <b>*Percent Error</b>, <span style="color:gray">*Previous Input File</span>, <span style="color:gray">*Print All Characters</span>, <span style="color:gray">*Print Character List</span>, <span style="color:gray">*Print Comment</span>, <span style="color:gray">*Print File</span>, <span style="color:gray">*Print Heading</span>, <span style="color:gray">*Print Item Descriptions</span>, <span style="color:gray">*Print Item Names</span>, <span style="color:gray">*Print Summary</span>, <span style="color:gray">*Print Uncoded Characters</span>, <span style="color:gray">*Print Width</span>, <b>*Registration Heading<!-- obsolete synonym of Heading --></b>, <b>*Registration Subheading<!-- the only place where one can define a project version or date! Still in use! --></b>, <span style="color:gray">*Registration Validation</span>, <span style="color:gray">*Replace Angle Brackets</span>, <b>*Replace Semicolon By Comma</b>, <span style="color:gray">*Replace State Codes</span>, <b>*Scale Characters</b>, <span style="color:gray">*Sequence Increment</span>, <span style="color:gray">*Show</span>, <span style="color:gray">*Sort States</span>, <span style="color:gray">*Special Storage</span>, <b>*Startup Images</b>, <span style="color:gray">*State Codes</span>, <span style="color:gray">*Stop After Item</span>, <span style="color:gray">*Subject For Output Files</span>, <b>*Taxon Images</b>, <b>*Taxon Keyword Images</b>, <b>*Taxon Links</b><!-- = full text document resources for taxa, e.g. species pages-->, <span style="color:gray">*Translate Implicit Values</span>, <span style="color:gray">*Translate Into</span>, <span style="color:gray">*Translate Uncoded Characters</span>, <span style="color:gray">*Treat Integer As Real</span>, <span style="color:gray">*Treat Unknown As Variable</span>, <span style="color:gray">*Treat Variable As Unknown</span>, <span style="color:gray">*Typesetting Marks</span>, <b>*Use Controlling Characters First</b>, <span style="color:gray">*Use Mean Values</span>, <span style="color:gray">*Use Last Value Coded</span>, <span style="color:gray">*Use Normal Values</span>, <b>*Vocabulary</b>, <strong>[Delfor:]</strong> *Control Phrases, <span style="color:gray">*New Character Order</span>, <span style="color:gray">*New Line For Attributes</span>, <span style="color:gray">*New State Orders</span>, <span style="color:gray">*Reformat</span>, <strong>[Key:]</strong> <span style="color:gray">*Abase</span>, <span style="color:gray">*Add Character Numbers</span>, <span style="color:gray">*Allow Improper Subgroups</span>, <span style="color:gray">*Characters File</span>, <span style="color:gray">*Dump</span>, <span style="color:gray">*Input File</span>, <span style="color:gray">*Items File</span>, <span style="color:gray">*Key Output File</span>, <span style="color:gray">*Key Typesetting File</span>, <span style="color:gray">*Matrix Dump</span>, <span style="color:gray">*No Bracketted Key</span>, <span style="color:gray">*No Tabular Key</span>, <span style="color:gray">*Number Of Confirmatory Characters</span>, <span style="color:gray">*Preset Characters</span>, <span style="color:gray">*Rbase</span>, <span style="color:gray">*Reuse</span>, <span style="color:gray">*Stop After Column</span>, <span style="color:gray">*Storage Factor</span>, <span style="color:gray">*Treat Characters As Variable</span>, <span style="color:gray">*Treat Unknown As Inapplicable</span>, <span style="color:gray">*Truncate Tabular Key At</span>, <span style="color:gray">*Typesetting Marks</span>, <span style="color:gray">*Varywt</span>, <strong>[Dist:]</strong> <span style="color:gray">*Items File</span>, <span style="color:gray">*Log</span>, <span style="color:gray">*Match Overlap</span>, <span style="color:gray">*Maximum Items In Memory</span>, <span style="color:gray">*Minimum Number Of Comparisons</span>, <span style="color:gray">*Names File</span>, <span style="color:gray">*Phylip Format</span> <strong>[Intkey:]</strong> Define Characters "keyword c1 c2 ...", Define Taxa "keyword t1 t2 ...", Define Names "keyword n1, n2, ...".</p>
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Furthermore, a comparison between DELTA and BDI.SDD should consider not only the old DELTA standard, but also the considerably more complex proposal for a new DELTA (M.&nbsp;J. Dallwitz, T.&nbsp;A. Paine, and E.&nbsp;J. Zurcher (1993 onwards, <a href="http://biodiversity.uno.edu/delta/www/proposal.htm">1999</a>, <a href="http://delta-intkey.com/www/proposal.htm">2005</a>) Proposed New Features for the DELTA System). BDI.SDD does address most of the issues raised in the DELTA II proposal.
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*See also the overview [[DELTAandBDI.SDD][DELTA and BDI.SDD]].*
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The proposed SDD schema has significant complexity and we believe that the complexity is necessary to store high quality data. However, we have taken great care to allow relatively simple SDD documents to be created. The [[PrimerHome][SDD primer]] explains the basics of using SDD. 
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A frequent argument we encounter is that SDD is more complex and difficult than DELTA. For a number of reasons we do not think this is true. One problem when comparing the complexity of <a href="http://biodiversity.bio.uno.edu/delta/">DELTA</a> and SDD is that the complexity of DELTA itself is difficult to assess. DELTA has a few basic directives, namely Character Type, Character List, and Item Descriptions that are minimally sufficient to start describing items. Character List, and Item Descriptions are, however, highly structured and map to several SDD elements.
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<p class="small"><b>*Absolute Error</b>, <span style="color:gray">*Accept Duplicate Values</span>, <b>*Add Characters</b><!--(Note: = item specific Include Characters directive, not supported by SDD!)-->, <b>*Alternate Comma</b>, <b>*Applicable Characters</b>, <b>*Character For Output Files</b>, <b>*Character Descriptions<!-- syn. of Char List, used by Pankey --></b>, <b>*Characters For Synonymy</b>, <b>*Character For Taxon Images</b>, <b>*Character For Taxon Names</b>, <b>*Character Headings</b>, <b>*Character Images</b>, <b>*Character Keyword Images</b>, <b>*Character List</b>, <b>*Character Notes</b>, <b>*Character Reliabilities</b>, <b>*Character Types</b>, <b>*Character Weights</b>, <b>*Chinese Format</b>, <b>*Comment</b>, <span style="color:gray">*Data Buffer Size</span>, <span style="color:gray">*Data Compression</span>, <span style="color:gray">*Data Listing</span>, <b>*Decimal Places</b>, <b>*Dependent Characters</b>, <span style="color:gray">*Disable Delta Output</span>, <span style="color:gray">*Dist Output File</span>, <b>*Emphasize Characters</b>, <b>*Emphasize Features</b>, <span style="color:gray">*End</span>, <span style="color:gray">*Error File</span>, <b>*Exclude Characters</b>, <b>*Exclude Items</b>, <b>*Heading</b>, <b>*Image Directory</b>, <b>*Implicit Values</b>, <b>*Inapplicable Characters</b>, <b>*Include Characters</b>, <b>*Include Items</b>, <span style="color:gray">*Index Headings</span>, <span style="color:gray">*Index Output File</span>, <span style="color:gray">*Index Text</span>, <span style="color:gray">*Input Delta File</span>, <span style="color:gray">*Input File</span>, <span style="color:gray">*Insert Character Sequence Numbers</span>, <span style="color:gray">*Insert Image File Name</span>, *Insert Implicit Values, <span style="color:gray">*Insert Item Sequence Numbers</span>, <span style="color:gray">*Insert Redundant Variant Attributes</span><!-- convert Variant taxa into full descriptions -->, <span style="color:gray">*Intkey Output File</span>, <b>*Item Abundances</b>, <b>*Item Descriptions</b>, <b>*Item Headings</b>, <span style="color:gray">*Item Output Files</span>, <b>*Item Subheadings</b>, <b>*Item Weights</b>, <b>*Key Character List</b>, <span style="color:gray">*Key Output File</span>, <b>*Key States</b>, <b>*Link Characters</b>, <span style="color:gray">*List Characters</span>, <span style="color:gray">*List Heading</span>, <span style="color:gray">*List Items</span>, <span style="color:gray">*Listing File</span>, <b>*Mandatory Characters</b>, <span style="color:gray">*Maximum Number Of Items</span>, <span style="color:gray">*Maximum Number Of States</span>, <b>*New Files At Items</b>, <span style="color:gray">*New Listing Page</span>, <b>*New Paragraphs At Characters</b>, <span style="color:gray">*New Print Page</span>, <span style="color:gray">*No Data Listing</span>, <b>*Nonautomatic Controlling Characters</b><!-- related to character dependency -->, <span style="color:gray">*Number Of Characters</span>, <span style="color:gray">*Number States From Zero</span>, <span style="color:gray">*Numbers Of States</span>, <span style="color:gray">*Omit Character Numbers</span>, <span style="color:gray">*Omit Comments</span>, <b>*Omit Final Comma</b>, <b>*Omit Inapplicables</b>, <b>*Omit Inner Comments</b>, <b>*Omit Lower For Characters</b>, <b>*Omit Or For Characters</b>, <b>*Omit Period For Characters</b>, <span style="color:gray">*Omit Redundant Variant Attributes</span><!-- reduce descriptions of Variant taxa to include only difference to parent -->, <b>*Omit Space Before Units</b>, <span style="color:gray">*Omit Typesetting Marks</span>, <span style="color:gray">*Output Directory</span>, <span style="color:gray">*Output File</span>, <span style="color:gray">*Output Format Html</span>, <span style="color:gray">*Output Parameters</span>, <span style="color:gray">*Output Width</span>, <span style="color:gray">*Overlay Fonts</span>, <span style="color:gray">*Page Length</span>, <b>*Percent Error</b>, <span style="color:gray">*Previous Input File</span>, <span style="color:gray">*Print All Characters</span>, <span style="color:gray">*Print Character List</span>, <span style="color:gray">*Print Comment</span>, <span style="color:gray">*Print File</span>, <span style="color:gray">*Print Heading</span>, <span style="color:gray">*Print Item Descriptions</span>, <span style="color:gray">*Print Item Names</span>, <span style="color:gray">*Print Summary</span>, <span style="color:gray">*Print Uncoded Characters</span>, <span style="color:gray">*Print Width</span>, <b>*Registration Heading<!-- obsolete synonym of Heading --></b>, <b>*Registration Subheading<!-- the only place where one can define a project version or date! Still in use! --></b>, <span style="color:gray">*Registration Validation</span>, <span style="color:gray">*Replace Angle Brackets</span>, <b>*Replace Semicolon By Comma</b>, <span style="color:gray">*Replace State Codes</span>, <b>*Scale Characters</b>, <span style="color:gray">*Sequence Increment</span>, <span style="color:gray">*Show</span>, <span style="color:gray">*Sort States</span>, <span style="color:gray">*Special Storage</span>, <b>*Startup Images</b>, <span style="color:gray">*State Codes</span>, <span style="color:gray">*Stop After Item</span>, <span style="color:gray">*Subject For Output Files</span>, <b>*Taxon Images</b>, <b>*Taxon Keyword Images</b>, <b>*Taxon Links</b><!-- = full text document resources for taxa, e.g. species pages-->, <span style="color:gray">*Translate Implicit Values</span>, <span style="color:gray">*Translate Into</span>, <span style="color:gray">*Translate Uncoded Characters</span>, <span style="color:gray">*Treat Integer As Real</span>, <span style="color:gray">*Treat Unknown As Variable</span>, <span style="color:gray">*Treat Variable As Unknown</span>, <span style="color:gray">*Typesetting Marks</span>, <b>*Use Controlling Characters First</b>, <span style="color:gray">*Use Mean Values</span>, <span style="color:gray">*Use Last Value Coded</span>, <span style="color:gray">*Use Normal Values</span>, <b>*Vocabulary</b>, <strong>[Delfor:]</strong> *Control Phrases, <span style="color:gray">*New Character Order</span>, <span style="color:gray">*New Line For Attributes</span>, <span style="color:gray">*New State Orders</span>, <span style="color:gray">*Reformat</span>, <strong>[Key:]</strong> <span style="color:gray">*Abase</span>, <span style="color:gray">*Add Character Numbers</span>, <span style="color:gray">*Allow Improper Subgroups</span>, <span style="color:gray">*Characters File</span>, <span style="color:gray">*Dump</span>, <span style="color:gray">*Input File</span>, <span style="color:gray">*Items File</span>, <span style="color:gray">*Key Output File</span>, <span style="color:gray">*Key Typesetting File</span>, <span style="color:gray">*Matrix Dump</span>, <span style="color:gray">*No Bracketted Key</span>, <span style="color:gray">*No Tabular Key</span>, <span style="color:gray">*Number Of Confirmatory Characters</span>, <span style="color:gray">*Preset Characters</span>, <span style="color:gray">*Rbase</span>, <span style="color:gray">*Reuse</span>, <span style="color:gray">*Stop After Column</span>, <span style="color:gray">*Storage Factor</span>, <span style="color:gray">*Treat Characters As Variable</span>, <span style="color:gray">*Treat Unknown As Inapplicable</span>, <span style="color:gray">*Truncate Tabular Key At</span>, <span style="color:gray">*Typesetting Marks</span>, <span style="color:gray">*Varywt</span>, <strong>[Dist:]</strong> <span style="color:gray">*Items File</span>, <span style="color:gray">*Log</span>, <span style="color:gray">*Match Overlap</span>, <span style="color:gray">*Maximum Items In Memory</span>, <span style="color:gray">*Minimum Number Of Comparisons</span>, <span style="color:gray">*Names File</span>, <span style="color:gray">*Phylip Format</span> <strong>[Intkey:]</strong> Define Characters "keyword c1 c2 ...", Define Taxa "keyword t1 t2 ...", Define Names "keyword n1, n2, ...".</p>
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Furthermore, a comparison between DELTA and SDD should consider not only the old DELTA standard, but also the considerably more complex proposal for a new DELTA (M.&nbsp;J. Dallwitz, T.&nbsp;A. Paine, and E.&nbsp;J. Zurcher (1993 onwards, <a href="http://biodiversity.uno.edu/delta/www/proposal.htm">1999</a>, <a href="http://delta-intkey.com/www/proposal.htm">2005</a>) Proposed New Features for the DELTA System). SDD does address most of the issues raised in the DELTA II proposal.
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*See also the overview [[DELTAandSDD][DELTA and SDD]].*
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