BABOK_Guide_v3_member_copy

Techniques
Data Dictionary
dictionary:
• Name: a unique name for the data element, which will be referenced by
the composite data elements.
• Aliases: alternate names for the data element used by various
stakeholders.
• Values/Meanings: a list of acceptable values for the data element. This
may be expressed as an enumerated list or as a description of allowed
formats for the data (including information such as the number of
characters). If the values are abbreviated this will include an explanation of
the meaning.
• Description: the definition of the data element in the context of the
solution.
.3 Composite Elements
Composite data elements are built using data elements to build composite
structures, which may include:
• Sequences: required ordering of primitive data elements within the
composite structure. For example, a plus sign indicates that one element is
followed by or concatenated with another element: Customer Name = First
Name+Middle Name+Family Name.
• Repetitions: whether one or more data elements may be repeated
multiple times.
• Optional Elements: may or may not occur in a particular instance of the
composite element.
10.12.4 Usage Considerations
.1 Strengths
• Provides all stakeholders with a shared understanding of the format and
content of relevant information.
• A single repository of corporate metadata promotes the use of data throughout
the organization in a consistent manner.
Complimentary IIBA® Member Copy. Not for Distribution or Resale.
.2 Limitations
• Requires regular maintenance, otherwise the metadata could become obsolete
or incorrect.
• All maintenance is required to be completed in a consistent manner in order to
ensure that stakeholders can quickly and easily retrieve the information they
need. This requires time and effort on the part of the stewards responsible for
the accuracy and completeness of the data dictionary.
• Unless care is taken to consider the metadata required by multiple scenarios, it
may have limited value across the enterprise.
249