C# Класс OpenADK.Library.au.Infrastructure.InfrastructureDTD

SIFDTD defines global {@linkplain com.edustructures.sifworks.ElementDef} constants that describe SIF Data Objects, elements, and attributes across all supported versions of the SIF Specification. The ADK uses this metadata internally to parse and render SIF Data Objects. In addition, many of the framework APIs require that the programmer pass an ElementDef constant from the SIFDTD class to identify an object, element, or attribute.

ElementDef constants are named [PARENT_]ENTITY, where PARENT is the name of the parent element and ENTITY is the name of the element or attribute encapsulated by the ElementDef. Some examples of ElementDef constants defined by this class include:

SDO Libraries

ElementDef metadata is grouped into "SDO Libraries", which are organized along SIF Working Group boundaries. SDO Libraries are loaded into the SifDdt class when the Adk is initialized. All or part of the metadata is loaded into depending on the flags passed to the Adk.Initialize(SifVersion, SdoLibraryType) method, metadata from one or more SDO Libraries may be loaded. For example, the following call loads metadata for the Student Information Working Group Objects and Transportation And Geographic Information Working Group Objects (Common Elements and Infrastructure Working Group Objects metadata is always loaded

If an given SDO Library is not loaded, all of the SIFDTD constants that belong to that library will be null and cannot be referenced. For example, given the SDO Libraries loaded above, attempting to reference the SIFDTD.LIBRARYPATRONSTATUS object from the Library Automation Working Group would result in a NullPointerException: