Modifying This Tag Set
Modular DTD Design
BITS has been written as a series of XML DTD modules that can be combined into a number of different tag sets. The modules are separate physical files that, taken together, define all element structures (such as tables, math, chemistry, paragraphs, sections, figures, footnotes, and reference elements), as well as attributes and entities in the Suite.
Modules in the Suite are primarily intended to group elements for maintenance. There are different kinds of modules. A module may:
- Be a building block for a base Tag Set (such as the module “Module to Name the JATS Modules”)
- Define the elements inside a particular structure. For example, the Bibliography References (Citation) Elements Module names all the potential components of bibliographic reference lists.
- Name the members of a “class” of elements, where class is a named grouping of elements that share a similar usage or potential location. For example, the Phrase-Level Content Elements Module defines small floating elements that may occur within text, such as inside a paragraph or a title, or that describe textual content, for example, a disease name, drug name, or the name of a discipline.
- Be a module of “editorial convenience”. For example, the module Common (Shared) Element Declarations Module holds elements and attributes used in the content models of the various class elements.
The major disadvantage of a modular system is the longer learning curve, since it may not be immediately obvious where within the system to find a particular element or attribute cluster. To help with this, each element page includes an expanded content model.
There are many advantages to such a modular approach. The smaller units are written once, maintained in one place, and used in many different tag sets. This makes it much easier to keep lower level structures consistent across document types, while allowing for any real differences that analysis identifies. A tag set for a new function (such as an authoring tag set) or a new publication type can be built quickly, since most of the necessary components will already be defined in the Suite. Editorial and production personnel can bring the experience gained on one tagging project directly to the next with very little loss or retraining. Customized software (including authoring, typesetting, and electronic display tools) can be written once, shared among projects, and modified only for real distinctions.
How to Start Using This Tag Library
If you want to learn about this Tag Set in order to write a new tag set based on this Tag Set or to modify the current Tag Set:
- Skim the first two chapters of this Tag Library, the How to Use and the Tag Library General Introduction.
- Read the parameter entities that name the classes (in the module %default-classes.ent;).
- If you do not know the symbols used in the Document Hierarchy diagrams, then read the “Key to the Near & Far® Diagrams”.
- Use the Document Hierarchy diagrams to give you a good sense of the top-level elements and their contents.
- Pick an element from one of the diagrams. (Look up the element in the Elements Section to find the full name of the element, the definition, usage notes, content allowed, and attributes list. Look up one of the attributes to find its full name, usage notes, and potential values.)
- Read the Tag Set Modules. New Tag
Sets are created by writing, at a minimum, a new DTD module and new customization modules, so you might want to read the modules in this order:
- The DTD module (BITS-book2.dtd);
- The module that names all the BITS-Book-Tag-Set-specific customization and element modules (BITS-bookcustom-modules2.ent);
- The module that names all the other modules in the Suite (%modules.ent;); and
- The BITS Book customization modules (BITS-bookcustom-classes2.ent), (BITS-bookcustom-mixes2.ent), and (BITS-bookcustom-models2.ent).
- Any one of the many class-defining modules from the Suite (for example, the %list.ent; module).