The C language does not define objects in the object-oriented programming sense. In libSBML's C API, the C++ object classes used to implement libSBML's functionality are expressed as C data structures whose names are suffixed with '_t', and access to the C++ object methods is provided in the form of functions whose names are prefixed with the class (data structure) name. The following is a list of all object data structures defined in this release of libSBML. Click on their names to view detailed information about them and the functions that operate on them.

CAlgebraicRule	{core} Implementation of SBML's AlgebraicRule construct
CAssignmentRule	{core} Implementation of SBML's AssignmentRule construct
CAssociation_t	{fbc} Implementation of the 'fbc' proposed package Association construct
CASTNode_t	{core} Abstract Syntax Tree (AST) representation of a mathematical expression
CBoundingBox_t	{layout} Representation of a bounding box
CCobraToFbcConverter	{fbc} Implementation of a COBRA to SBML Level 3 'fbc' package converter
CCompartment_t	{core} Implementation of SBML's Compartment construct
CCompartmentGlyph_t	{layout} Representation of a compartment glyph
CCompartmentType_t	{core} Implementation of SBML's Level 2's CompartmentType construct
CCompBase	{comp} A convenience subclass of “comp” package SBase-derived classes
CCompExtension	{comp} The core module of the “comp” package extension
CCompFlatteningConverter	{comp} Flattening converter for the “comp” package
CCompModelPlugin	{comp} Implementation of the “comp” package extention to the Model construct
CCompPkgNamespaces	{comp} Extension of SBMLNamespaces for the SBML Level 3 'comp' package
CCompSBasePlugin	{comp} Implementation of the “comp” package extention to the SBase construct
CCompSBMLDocumentPlugin_t	{comp} Implementation of the “comp” package extention to the SBMLDocument construct
CCompValidator	{comp} Entry point for libSBML's implementation of SBML validation rules for the “comp” package
CConstraint_t	{core} Implementation of SBML's Constraint construct
CConversionOption_t	{core} Class of object that encapsulates a conversion option
CConversionProperties_t	{core} Class of object that encapsulates the properties of an SBML converter
CCubicBezier_t	{layout} A CubicBezier represents a smooth curve in the “layout” package
CCurve_t	{layout} The Curve class describes how to connect elements in a diagram defined with the use of the “layout” package
CCVTerm_t	{core} Representation of MIRIAM-compliant controlled vocabulary annotation
CDate_t	{core} Representation of MIRIAM-compliant dates used in ModelHistory
CDefaultTerm_t	{qual} The DefaultTerm class for the Qualitative Models package
CDelay_t	{core} Implementation of SBML's Delay construct for Event
CDeletion_t	{comp} Implementation of the Deletion construct from the “comp” package
CDimensions_t	{layout} The Dimensions class describes the overall 2D or 3D shape of a “layout” package object
Cdoc_about_mathml_semantic_annotations	The `<semantics>` element is a MathML 2.0 construct that can be used to associate additional information with a MathML construct
Cdoc_additional_typecode_details
Cdoc_algebraicrule_setting_lv
Cdoc_astnode_types
Cdoc_base_units
Cdoc_compartment_both_size_and_volume
Cdoc_compartment_units
Cdoc_compartmenttype_setting_lv
Cdoc_config_for_reading_zipped_files
Cdoc_config_for_writing_zipped_files
Cdoc_constraint_setting_lv
Cdoc_cvterm_common_description
Cdoc_date_string_format
Cdoc_delay_setting_lv
Cdoc_delay_units
Cdoc_errorlog_what_are_severities
Cdoc_event_setting_lv
Cdoc_event_using_useValuesFromTriggerTime
Cdoc_eventassignment_units
Cdoc_id_syntax
Cdoc_initialassignment_units
Cdoc_kineticlaw_units
Cdoc_localparameter_units
Cdoc_note_assignmentRule_setting_lv
Cdoc_note_charge_deprecated
Cdoc_note_compartment_setting_lv
Cdoc_note_compartment_volume
Cdoc_note_eventassignment_setting_lv
Cdoc_note_functiondefinition_setting_lv
Cdoc_note_initialassignment_setting_lv
Cdoc_note_kineticlaw_setting_lv
Cdoc_note_localparameter_setting_lv
Cdoc_note_mathml_semantic_annotations_uncommon
Cdoc_note_model_setting_lv
Cdoc_note_modifierspeciesreference_setting_lv
Cdoc_note_object_is_copied
Cdoc_note_parameter_about_constant
Cdoc_note_parameter_setting_lv
Cdoc_note_priority_only_l3
Cdoc_note_priority_setting_lv
Cdoc_note_raterule_setting_lv
Cdoc_note_reaction_setting_lv
Cdoc_note_sbmlreader_error_handling
Cdoc_note_spatial_dimensions_as_double
Cdoc_note_species_setting_lv
Cdoc_note_species_units
Cdoc_note_speciesreference_setting_lv
Cdoc_note_speciestype_setting_lv
Cdoc_note_stoichiometrymath_availability
Cdoc_note_stoichiometrymath_setting_lv
Cdoc_note_timeunits_substanceunits
Cdoc_note_unassigned_unit_are_not_a_default
Cdoc_note_unit_analysis_depends_on_model
Cdoc_note_unit_inference_depends_on_model
Cdoc_note_unit_setting_lv
Cdoc_note_unitdefinition_setting_lv
Cdoc_rule_level_1
Cdoc_rule_units
Cdoc_rules_general_summary
Cdoc_sbase_what_is_user_data
Cdoc_sbml_error_code_ranges
Cdoc_sbml_error_table
Cdoc_sbmldocument_default_level
Cdoc_sbmldocument_default_version
Cdoc_sbmlnamespaces_what_is_it
Cdoc_sbmlreader_if_compressed
Cdoc_summary_of_string_math
Cdoc_summary_of_string_math_l3
Cdoc_warning_delay_math_literals
Cdoc_warning_event_timeUnits
Cdoc_warning_eventassignment_math_literals
Cdoc_warning_initialassignment_math_literals
Cdoc_warning_kineticlaw_math_literals
Cdoc_warning_L1_math_string_syntax
Cdoc_warning_modifying_structure
Cdoc_warning_reaction_cant_ignore_fast
Cdoc_warning_rule_math_literals
Cdoc_warning_species_spatialSizeUnits
Cdoc_warning_typecodes_not_unique
Cdoc_warning_unit_offset_only_l2v1
Cdoc_warning_useValuesFromTriggerTime
Cdoc_what_are_annotations
Cdoc_what_are_cvterms
Cdoc_what_are_notes
Cdoc_what_are_plugins
Cdoc_what_are_sbmlnamespaces
Cdoc_what_are_typecodes
Cdoc_what_is_astnode
Cdoc_what_is_listof
Cdoc_what_is_metaid
Cdoc_what_is_metaidref
Cdoc_what_is_SBMLDocument
Cdoc_what_is_sid
Cdoc_what_is_sidref
Cdoc_what_is_unitsidref
CEvent_t	{core} Implementation of SBML's Event construct
CEventAssignment_t	{core} Implementation of SBML's EventAssignment construct for Event
CExternalModelDefinition_t	{comp} Implementation of the ExternalModelDefinition construct from the “comp” package
CFbcExtension	{fbc} The core module of the 'fbc' package extension
CFbcModelPlugin	{fbc} Implementation of the 'fbc' package extention to the Model construct
CFbcPkgNamespaces	{fbc} Extension of SBMLNamespaces for the SBML Level 3 'fbc' package
CFbcSBMLDocumentPlugin	{fbc} Implementation of the 'fbc' package extention to the SBMLDocument construct
CFbcSpeciesPlugin	{fbc} Implementation of the 'fbc' package extention to the Species construct
CFbcToCobraConverter	{fbc} Implementation of a SBML Level 3 'fbc' package to COBRA converter
CFbcValidator	{fbc} Entry point for libSBML's implementation of SBML validation rules for 'fbc'
CFluxBound_t	{fbc} Implementation of the 'fbc' package FluxBound construct
CFluxObjective_t	{fbc} Implementation of the 'fbc' package FluxObjective construct
CFormulaTokenizer_t	{core} used to track the state of tokenizing a string
CFunctionDefinition_t	{core} Implementation of SBML's FunctionDefinition construct
CFunctionTerm_t	{qual} The FunctionTerm class for the Qualitative Models package
CGeneAssociation_t	{fbc} Implementation of the 'fbc' package GeneAssociation construct
CGeneralGlyph_t	{layout} The GeneralGlyph is used by the “layout” package to represent any SBML object
CGraphicalObject_t	{layout} The basic “layout” package element for storing layout information
CInitialAssignment_t	{core} Implementation of SBML's InitialAssignment construct
CInput_t	{qual} The Input class for the Qualitative Models package
CKineticLaw_t	{core} Implementation of SBML's KineticLaw construct
CL3ParserSettings_t	{core} A helper class for controlling the behavior of the text-string formula parser
CLayout_t	{layout} Each Layout object stores a set of layout information for objects in the Model
CLayoutExtension	{layout} The core module of the 'layout' package extension
CLayoutModelPlugin	{layout} Implementation of the 'layout' package extention to the Model construct
CLayoutPkgNamespaces	{layout} Extension of SBMLNamespaces for the SBML Level 3 'layout' package
CLayoutSBMLDocumentPlugin	{layout} Implementation of the 'layout' package extention to the SBMLDocument construct
CLayoutSpeciesReferencePlugin	{layout} Implementation of the 'layout' package extention to the SpeciesReference construct
CLayoutValidator	{layout} Entry point for libSBML's implementation of SBML validation rules for the “layout” package
CLineSegment_t	{layout} The representation of a line in the “layout” package
CList_t	{core} Simple, plain, generic lists, and associated list utilities
CListOf_t	{core} Parent class for libSBML's "ListOfXYZ" classes
CListOfCompartments	{core} Implementation of SBML Level 2's ListOfCompartments construct
CListOfCompartmentTypes	{core} Implementation of SBML's ListOfCompartmentTypes construct
CListOfConstraints	{core} Implementation of SBML's ListOfConstraints construct
CListOfDeletions	{comp} Implementation of the ListOfDeletions construct from the “comp” package
CListOfEventAssignments	{core} Implementation of SBML's ListOfEventAssignments construct
CListOfEvents	{core} Implementation of SBML's ListOfEvents construct
CListOfExternalModelDefinitions	{comp} Implementation of the ListOfExternalModelDefinitions construct from the “comp” package
CListOfFunctionDefinitions	{core} Implementation of SBML's ListOfFunctionDefinitions construct
CListOfInitialAssignments	{core} Implementation of SBML's ListOfInitialAssignments construct
CListOfLocalParameters	{core} Implementation of SBML Level 3's ListOfLocalParameters construct
CListOfModelDefinitions	{comp} Implementation of the ListOfModelDefinitions construct from the “comp” package
CListOfParameters	{core} Implementation of SBML's ListOfParameters construct
CListOfPorts	{comp} Implementation of the ListOfPorts construct from the “comp” package
CListOfReactions	{core} Implementation of SBML's ListOfReactions construct
CListOfReplacedElements	{comp} Implementation of the ListOfReplacedElements construct from the “comp” package
CListOfRules	{core} Implementation of SBML's ListOfRules construct
CListOfSpecies	{core} Implementation of SBML Level 2's ListOfSpecies construct
CListOfSpeciesReferences	{core} Implementation of SBML's ListOfSpeciesReferences construct
CListOfSpeciesTypes	{core} Implementation of SBML's ListOfSpeciesTypes construct
CListOfSubmodels	{comp} Implementation of the ListOfSubmodels construct from the “comp” package
CListOfUnitDefinitions	{core} Implementation of SBML's ListOfUnitDefinitions construct
CListOfUnits	{core} Implementation of SBML's ListOfUnits construct
CLocalParameter_t	{core} Implementation of SBML Level 3's LocalParameter construct
CModel_t	{core} Implementation of SBML's Model construct
CModelCreator_t	{core} Representation of MIRIAM-compliant model creator data used in ModelHistory
CModelDefinition_t	{comp} Implementation of the ModelDefinition construct from the “comp” package
CModelHistory_t	{core} Representation of MIRIAM-compliant model history data
CModifierSpeciesReference	{core} Implementation of SBML's ModifierSpeciesReference construct
CObjective_t	{fbc} Implementation of the 'fbc' package Objective construct
COutput_t	{qual} The Output class for the Qualitative Models package
CParameter_t	{core} Implementation of SBML's Parameter construct
CPoint_t	{layout} The representation of a point in the “layout” package
CPort_t	{comp} Implementation of the Port construct from the “comp” package
CPriority_t	{core} Implementation of SBML Level 3's Priority construct for Event
CQualExtension	{qual} The core module of the 'qual' package extension
CQualitativeSpecies_t	{qual} The QualitativeSpecies class for the Qualitative Models package
CQualModelPlugin	{qual} Implementation of the 'qual' package extention to the Model construct
CQualPkgNamespaces	{qual} Extension of SBMLNamespaces for the SBML Level 3 'qual' package
CQualSBMLDocumentPlugin	{qual} Implementation of the 'qual' package extention to the SBMLDocument construct
CQualValidator	{qual} Entry point for libSBML's implementation of SBML validation rules for 'qual'
CRateRule	{core} Implementation of SBML's RateRule construct
CRDFAnnotationParser	{core} Read/write/manipulate RDF annotations stored in SBML annotation elements
CReaction_t	{core} Implementation of SBML's Reaction construct
CReactionGlyph_t	{layout} The ReactionGlyph is used to represent Reaction elements in the layout
CReferenceGlyph_t	{layout} The ReferenceGlyph is used by the “layout” package to connect a GraphicalObject and a GeneralGlyph
CReplacedBy_t	{comp} Implementation of the ReplacedBy construct from the “comp” package
CReplacedElement_t	{comp} Implementation of the ReplacedElement construct from the “comp” package
CReplacing	{comp} A convenience subclass of the ReplacedElement and ReplacedBy constructs from the “comp” package
CRule_t	{core} Implementation of SBML's Rule construct
CSBase_t	{core} Implementation of SBase, the base class of most SBML objects
CSBaseExtensionPoint_t	{core} Representation of an extension point of SBML's package extension
CSBasePlugin_t	{core} Representation of a plug-in object of SBML's package extension
CSBasePluginCreator	{core} Template class of SBasePlugin
CSBasePluginCreatorBase_t	{core} Base class of SBasePluginCreator
CSBaseRef_t	{comp} Implementation of the SBaseRef construct from the “comp” package
CSBMLConstructorException	{core} Class of exceptions thrown by constructors of some libSBML objects
CSBMLConverter	{core} Base class for SBML converters
CSBMLConverterRegistry	{core} Registry of all SBML converters
CSBMLDocument_t	{core} Container for an SBML document and interface for global operations on SBML documents
CSBMLDocumentPlugin_t	{core} Template class for the SBMLDocument Plugin class needed by all packages
CSBMLDocumentPluginNotRequired	{core} Template class for the SBMLDocument Plugin class for non-required packages
CSBMLError_t	{core} Representation of errors, warnings and other diagnostics
CSBMLErrorLog	{core} Log of errors and other events encountered during SBML processing
CSBMLExtension_t	{core} The core component of SBML's package extension
CSBMLExtensionException	{core} Exceptions for libSBML extensions for SBML Level 3 packages
CSBMLExtensionNamespaces	{core} Class to store the Level, Version and XML namespace information of an SBML extension package
CSBMLExtensionRegister	{core} Template class for registering an extension package to the SBMLExtensionRegistry class
CSBMLExtensionRegistry	{core} Registry class in which extension packages are registered
CSBMLFileResolver	{comp} A resolver for documents stored on a file system
CSBMLFunctionDefinitionConverter	{core} SBML converter for replacing function definitions
CSBMLIdConverter	{core} SBML converter for replacing SIds
CSBMLInferUnitsConverter	{core} SBML converter for inferring the units of parameters
CSBMLInitialAssignmentConverter	{core} SBML converter for replacing initial assignments
CSBMLInternalValidator	{core} Implementation of basic SBML consistency checks and other validations
CSBMLLevelVersionConverter	{core} SBML converter for transforming documents from one Level+Version to another
CSBMLLocalParameterConverter	{core} SBML converter for replacing SIds
CSBMLNamespaces_t	{core} Class to store SBML Level, Version and namespace information
CSBMLReactionConverter	{core} SBML converter for replacing reactions with rate rules
CSBMLReader_t	{core} Methods for reading SBML from files and text strings
CSBMLResolver	{comp} Base class for SBML resolvers
CSBMLResolverRegistry	{comp} Registry of all SBML resolvers
CSBMLRuleConverter	{core} SBML converter for reordering rules and assignments in a model
CSBMLStripPackageConverter	{core} SBML converter for removing packages
CSBMLUnitsConverter	{core} SBML converter to convert a model's units to SI units
CSBMLUri	{comp} utility class for handling URIs
CSBMLValidator	{core} Base class for SBML validators
CSBMLVisitor	{core} Support class for performing operations on SBML objects
CSBMLWriter_t	{core} Methods for writing SBML to files and text strings
CSBO	{core} Methods for interacting with Systems Biology Ontology terms
CSpecies_t	{core} Implementation of SBML's Species construct
CSpeciesGlyph_t	{layout} The SpeciesGlyph represents a Species in the “layout” package
CSpeciesReference	{core} Implementation of SBML's SpeciesReference construct
CSpeciesReference_t	{core} Implementation of SBML's SimpleSpeciesReference construct
CSpeciesReferenceGlyph_t	{layout} A SpeciesReferenceGlyph represents a reactant or product from a Reaction in the “layout” package
CSpeciesType_t	{core} Implementation of SBML Level 2's SpeciesType construct
CStoichiometryMath_t	{core} Implementation of SBML Level 2's StoichiometryMath construct
CSubmodel_t	{comp} Implementation of the Submodel construct from the “comp” package
CSyntaxChecker	{core} Methods for checking syntax of SBML identifiers and other strings
CTextGlyph_t	{layout} The TextGlyph class describes the position and dimension of text labels in the “layout” package
CToken_t	{core} Structure used to store a token returned by FormulaTokenizer_nextToken()
CToken_t.value
CTransition_t	{qual} The Transition class for the Qualitative Models package
CTrigger_t	{core} Implementation of SBML's Trigger construct for Event
CUnit_t	{core} Implementation of SBML's Unit construct
CUnitDefinition_t	{core} Implementation of SBML's UnitDefinition construct
CValidator	{core} Entry point for libSBML's implementation of SBML validation rules
CVConstraint	{core} Helper class for implementing SBML validation and consistency-checking
CXMLAttributes_t	{core} Representation of attributes on an XML node
CXMLConstructorException	{core} Class of exceptions thrown by constructors of some libSBML objects
CXMLError_t	{core} Representation of errors, warnings and other diagnostics
CXMLErrorLog_t	{core} Log of errors and other events encountered while processing an XML file or data stream
CXMLLogOverride	{core} Utility class implementing a temporary override the severity on error logs
CXMLNamespaces_t	{core} Representation of XML Namespaces
CXMLNode_t	{core} Representation of a node in an XML document tree
CXMLToken_t	{core} Representation of a token in an XML stream
CXMLTriple_t	{core} Representation of a qualified XML name