1 Narrative Explaining Logical Conceptualization of a Financial Report Charles Hoffman, CPA September 30, 2019 (DRAFT) The purpose of this resource is to provide a common sharable logical conceptualization 1 of the basic underlying model of a financial report. Key terms in this logical conceptualization are highlighted in bold the first time they are used and are referenced to additional information 2 . The logical relations between terms are documented in this diagram 3 . The assertions in this conceptualization are documented in the form of axioms 4 . This conceptualization is also documented in machine-readable XBRL 5 and in machine-readable OWL 6 . This conceptualization has been tested 7 using four application profiles of XBRL-based financial reports 8 by four different software vendors 9 . Curated metadata 10 can be created using this conceptualization. A financial report can be explained using four core models 11 : logical system model, business report model, multidimensional model, and the accounting equation and double-entry accounting model. The multidimensional model is explained as part of the basic business report model. A basic logical conceptualization is provided for those that desire a high-level understanding of the logical conceptualization of a business report. A more detailed conceptualization of a business report is provided in a separate section for those that desire 1 Enhanced Description of an Ontology-like Thing, http://xbrl.squarespace.com/journal/2019/7/19/enhanced- description-of-ontology-like-thing.html 2 Open Source Framework for Implementing XBRL-based Digital Financial Reporting, http://xbrlsite.azurewebsites.net/2019/Framework/FrameworkEntitiesSummary.html 3 Logical Model, http://xbrlsite.azurewebsites.net/2016/conceptual-model/LogicalModel-2019-03-10.jpg 4 Axioms, http://xbrlsite.azurewebsites.net/2019/Framework/Axioms.html 5 Prototype SBRM Represented in XBRL, http://xbrl.squarespace.com/journal/2019/7/14/prototype-sbrm- represented-in-xbrl.html 6 Prototype SBRM Representation in OWL, http://xbrlsite.azurewebsites.net/2019/SBRM/sbrm.owl.xml 7 Comparison of Renderings for Concept Arrangement Patterns, http://xbrlsite.azurewebsites.net/2019/Prototype/conformance- suite/Production/ComparisonOfConceptArrangementPatternRenderings.pdf 8 Profiles, http://xbrlsite.azurewebsites.net/2018/Library/Profiles-2018-10-22.pdf 9 Digital Financial Report Conformance Suite, http://xbrlsite.azurewebsites.net/2019/Prototype/conformance- suite/Production/index.xml 10 US GAAP Financial Report Ontology (Prototype), http://xbrlsite.azurewebsites.net/2019/Prototype/New/Home.html 11 Four Core Models Used to Describe a Financial Report, http://xbrl.squarespace.com/journal/2019/9/25/four- core-models-used-to-describe-a-financial-report.html
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1
Narrative Explaining Logical Conceptualization
of a Financial Report Charles Hoffman, CPA
September 30, 2019 (DRAFT)
The purpose of this resource is to provide a common sharable logical conceptualization1 of the
basic underlying model of a financial report.
Key terms in this logical conceptualization are highlighted in bold the first time they are used
and are referenced to additional information2. The logical relations between terms are
documented in this diagram3. The assertions in this conceptualization are documented in the
form of axioms4. This conceptualization is also documented in machine-readable XBRL5 and in
machine-readable OWL6. This conceptualization has been tested7 using four application profiles
of XBRL-based financial reports8 by four different software vendors9. Curated metadata10 can
be created using this conceptualization.
A financial report can be explained using four core models11: logical system model, business
report model, multidimensional model, and the accounting equation and double-entry
accounting model. The multidimensional model is explained as part of the basic business
report model. A basic logical conceptualization is provided for those that desire a high-level
understanding of the logical conceptualization of a business report. A more detailed
conceptualization of a business report is provided in a separate section for those that desire
1 Enhanced Description of an Ontology-like Thing, http://xbrl.squarespace.com/journal/2019/7/19/enhanced-description-of-ontology-like-thing.html 2 Open Source Framework for Implementing XBRL-based Digital Financial Reporting, http://xbrlsite.azurewebsites.net/2019/Framework/FrameworkEntitiesSummary.html 3 Logical Model, http://xbrlsite.azurewebsites.net/2016/conceptual-model/LogicalModel-2019-03-10.jpg 4 Axioms, http://xbrlsite.azurewebsites.net/2019/Framework/Axioms.html 5 Prototype SBRM Represented in XBRL, http://xbrl.squarespace.com/journal/2019/7/14/prototype-sbrm-represented-in-xbrl.html 6 Prototype SBRM Representation in OWL, http://xbrlsite.azurewebsites.net/2019/SBRM/sbrm.owl.xml 7 Comparison of Renderings for Concept Arrangement Patterns, http://xbrlsite.azurewebsites.net/2019/Prototype/conformance-suite/Production/ComparisonOfConceptArrangementPatternRenderings.pdf 8 Profiles, http://xbrlsite.azurewebsites.net/2018/Library/Profiles-2018-10-22.pdf 9 Digital Financial Report Conformance Suite, http://xbrlsite.azurewebsites.net/2019/Prototype/conformance-suite/Production/index.xml 10 US GAAP Financial Report Ontology (Prototype), http://xbrlsite.azurewebsites.net/2019/Prototype/New/Home.html 11 Four Core Models Used to Describe a Financial Report, http://xbrl.squarespace.com/journal/2019/9/25/four-core-models-used-to-describe-a-financial-report.html
“All Geographic Areas Combined = North America + South America”.
Rules both describe and can be used to verify that reported facts are consistent with the
provided description. There are many different types of rules including mathematical,
structural, mechanical, logical, and accounting related rules.
Grain24 is the level of depth of information or granularity. The lowest level of granularity is the
actual transaction, event, circumstance, or other phenomenon represented as the actual
transaction within an accounting system. The highest level of granularity is the summarized
information that is represented as a line item of perhaps a statement, say the income
statement.
Considering the fact set you see below the fact outlined in red is one level of granularity as
contrast to the other two facts that are outlined in green which provides the same information
as is provided by the fact outlined in red, but at a different level of granularity.
And so hopefully you get an idea of the logical model of a business report. Now we want to
shift gears a bit and be a bit more specific as to how business reports are represented using
XBRL.
An information model definition25 is a structure which is created to represent each fragment of
a report using the XBRL technical format or perhaps some other technical syntax. The following
24 Grain, http://xbrlsite.azurewebsites.net/2019/Framework/Details/Grain.html 25 Information Model Definition, http://xbrlsite.azurewebsites.net/2019/Framework/Details/InformationModelDefinition.html
Another part of the information model description is the mathematical rules that are used to
describe and verify the roll up relations of the concepts that are a part of the information
model description. Here is the roll up relations that are part of this information model
description.
Another part of the information model description is the facts within the fact set themselves.
Here is the fact set or the fact table34 for the facts that go with the information model
description provided above.
A software application takes the information model description structure, the information
model description rules provided, the facts that are included within the fact set, and known
best practices for rendering a business report that are coded into the software application in
some manner and then generates a human-readable rendering of the reported information for
a fragment or fact set of a report.
The following is the rendering35 of the inventory components disclosure that we are working
with above:
34 Fact Table, TO DO… 35 Rendering, TO DO…
8
Different software applications will provide slightly different renderings using the same XBRL-
based input information36.
Here is what the information model description might look like in that software application:
Here is what the roll up rule relations representation might look like in that software
application:
Software applications use the rule relations that describe or explain the relations to verify that
reported facts are consistent with that explanation. Here is a software application interface for
36 Comparison of Renderings for Concept Arrangement Patterns, http://xbrlsite.azurewebsites.net/2019/Prototype/conformance-suite/Production/ComparisonOfConceptArrangementPatternRenderings.pdf
Standards setters create financial reporting schemes79. Within those financial reporting
schemes, the standards setter expands on the accounting equation in slightly different ways per
the specific needs of that specific financial reporting scheme. But they never violate the
accounting equation. These rules tend to be outlined along with other important information
within a conceptual framework for that financial reporting scheme. The financial reporting
scheme defines a core set of classes of elements used by that financial reporting scheme which
reconciles to the accounting equation.
The elements of financial statements80 are the building blocks with which financial statements
are constructed; the classes of items that financial statements comprise. The items in the
financial statements of an economic entity represent in words and numbers certain entity
resources, claims to those resources, and the effects of transactions and other events,
circumstances, and other phenomenon that result in changes in those resources and claims.
These classes of building blocks are intentionally interrelated mathematically within the four
core statements that make up a financial report; this is called 'articulation'. Intermediate
components, i.e. subtotals, can be used to represent the items of an economic entity within the
items that comprise a financial report. However, these intermediate components and the items
must fit into the core framework of the classes of elements of a financial report.
The high-level model of a financial report and double-entry accounting can be represented
within the XBRL technical syntax81 and then used to both explain a financial report model and
verify that the financial report model is consistent with that explanation82.
79 Comparison of Financial Reporting Schemes High Level Concepts, http://xbrlsite.azurewebsites.net/2018/Library/ReportingSchemes-2018-12-30.pdf 80 Charles Hoffman, CPA, Enhanced US GAAP Financial Report Elements, http://xbrlsite.azurewebsites.net/2019/Core/core-usgaap/EnhancedFinancialReportElements.pdf 81 Methodically Proving the Financial Report Conceptual Model Top Down, http://xbrl.squarespace.com/journal/2019/9/3/methodically-proving-the-financial-report-conceptual-model-t.html 82 Human readable example of the four statement model, http://xbrlsite.azurewebsites.net/2019/Core/core-02-furtherEnhanced/evidence-package/contents/index.html#Rendering-BS-Implied.html
The four primary financial statements form the high-level structure of a financial report. The
balance sheet provides a roll up of assets, a roll up of liabilities and equity, and the rule “Assets
= Liabilities + Equity”. The income statement is used to compute that roll up total, “Net
Income” and rules for how the subcomponents of Net Income roll up. Net income then flows to
the statement of changes in equity which is a roll forward which reconciles beginning and
ending equity. The cash flow statement is a roll up of Net Cash Flow, rules that specify how the
subcomponents of net cash flow roll up, and a roll forward of the asset Cash and Cash
Equivalents which reconciles the beginning and ending balance of Assets on the balance sheet.
While the model shown above which is based on “Assets = Liabilities and Equity”; some
economic entities use different sorts of models. For example, some economic entities report
using a liquidation basis style balance sheet where “Assets - Liabilities = Net Assets”. “Net
Assets” and “Equity” are two different labels for what is the same concept.
Using the rules of mathematics, the equation “Assets = Liabilities + Equity” can be converted to
“Assets - Liabilities = Equity”.
So, while a financial report is not a static form it is not random either. Financial reports follow
patterns and these patterns can be explained using specific models to account for and manage
the variability inherent in a financial report83.
83 Managing and Controlling Variability in XBRL-based Financial Reports, http://xbrlsite.azurewebsites.net/2019/Library/ManagingAndControllingVariability.pdf
There are many different ways to describe formal systems in human-understandable and
machine-understandable terms. ISO/IEC 11179-3:201396 describes this sort of information in
global standard but technical terms. It is my observation97 that each different approach to
describing a formal system tends to have its own terminology for explaining what seems to be
exactly the same thing, the explanations tend to not always be complete, and the explanations
tend to be harder than necessary for a business professional to understand.
Philosophers working with logic, engineers building electronic circuits, computer engineers
creating software systems, mathematicians creating proofs, and knowledge engineers creating
ontologies are all doing extremely similar things (I would contend that they are actually doing
EXACTLY the same thing) but all these folks seem to be working in their little “silos” and are
going about this slightly differently.
Each silo as terminology which is inconsistent with other silos, the completeness/precision of
the explanations each silo provides as to what they are doing and the approach they are using is
unique to each silo, all of the explanations tend to be overly technical, there generally is no
“high-level” summary of the explanations, there certainly is no possibility of saying that one silo
is a “best practice” or “standard” approach for describing exactly what they are all really doing,
and as a consequence of all this a pretty darn simple idea and opportunity is being completely
missed.
This is my current best shot at explaining how to express the semantics of a logical system and
map those semantics to the XBRL technical syntax in terms understandable to a business
professional.
A logical system enables a community of stakeholders to agree on important common models,
structures, and statements for capturing meaning or representing a shared understanding of
and knowledge in some universe of discourse where specific flexibility/variability is
necessary. Because flexibility/variability is allowed in this sort of logical system, that
flexibility/variability must be managed so that it can be controlled. Models, structures, and
statements allow for this necessary management and control.
▪ Theory: A theory is a set of models for a universe of discourse (a.k.a. domain of
discourse, domain)
▪ Model: A model is a set of structures. A model is an allowable interpretation that
satisfies the theory98.
▪ Structure: A structure is a set of statements.
96 ISO, ISO/IEC 11179-3:2013 Information technology — Metadata registries (MDR) — Part 3: Registry metamodel and basic attributes, https://www.iso.org/standard/50340.html 97 Brainstorming How to Describe Semantics of a Flexible Yet Finite Logical System, http://xbrl.squarespace.com/journal/2019/9/10/brainstorming-how-to-describe-semantics-of-a-flexible-yet-fi.html 98 Wikipedia, Model Theory, https://en.wikipedia.org/wiki/Model_theory