Rules that govern automatic conversion between of EDA events and Apama events

EDA schema construct	Conventions/rules
Simple XML type	Represented by a simple type field such as string or integer.
Complex XML type	Represented by Apama events having the same name and structure.
XML attribute	Represented by a simple type field. The name of the field is obtained by prefixing an underscore to the attribute name.
Simple XML element	Represented by a simple type field with same name.
Complex XML element	Represented by a field of event type. The event type corresponds directly to the complex type of the element. The name of the field is equal to the element name.
Anonymous complex type element	Represented by a field of event type. The event type corresponds directly to the anonymous complex type. The name of the event type is derived by combining the parent elements/types names and the current element name. The name of the field is equal to the element name.
Namespace	The package of generated Apama events corresponds directly to the namespace of the corresponding XML Schema types. The package is obtained by stripping the fixed part of the namespace name and by replacing "/" with ".". The package name is translated into the namespace name when generating EDA XML from Apama events. For details, see Rules that govern EPL name generation.
Element cardinality	An element with a cardinality combination other than minOccurs=1 and maxOccurs=1 is represented as a sequence of corresponding types, that is, a sequence of simple types for simple type elements or a sequence of event types for complex type elements. You must ensure that the size of the sequence is according to the cardinality.
Optional attribute	Represented by a sequence of the corresponding simple type. An empty sequence represents the absence of attributes. The sequence can contain zero or one element.
Sequence	Corresponding fields for all the elements are added to a parent event type that corresponds to the complex type.
All	Corresponding fields for all the elements are added to a parent event type that corresponds to the complex type.
Choice	Corresponding sequence type fields for all the elements are added to the parent event type. Only the sequence of the chosen element should be filled; the others must be empty.
Restriction	A simple type element with one or more restrictions is represented by a simple type field of the corresponding type. You must ensure that the value specified is within restrictions.
Extension of simple type	Represented by an event type. The event type contains a simple type field named xmlTextNode to hold the text content of the element. Additionally, the event type contains fields for attributes.
Extension of complex type	Represented by two events, one corresponds to the base type and the other corresponds to the extension type. The event corresponding to the extension type contains all fields added by the extension type. It also contains a field named xmlExtends that is of the base event type.
Element reference	A separate event is generated for a referenced element. The name of the event is the referenced element name appended with Element. The event contains a field with the same name as the referenced element name. The event using the reference element contains a field whose name is obtained by prefixing xml to the referenced element name.
anyType	An element of type xsd:anyType is represented by a field of string type or sequence<string> type depending on the cardinality. The name of the field is obtained by prefixing xml to field name. The content of the field is the whole element node serialized as a string.
any	The xsd:any element is represented by a field named xmlFragments. The type of the field is string or sequence<string> depending on the cardinality. The content of the field is the whole XML node corresponding to xsd:any serialized as a string.
anyAttributes	The xsd:anyAttributes element is represented by a field named xmlAttributes of type dictionary<string,string>. The content of the dictionary is name/value pairs for attributes that correspond to xsd:anyAttributes.
Special characters	If an XML name contains a hyphen or a period, or begins with a number, special treatment in EPL is required. For details, see Rules that govern EPL name generation.
anySimpleType or anyURI	An element of type xsd:anySimpleType or xsd:anyURI is represented by a field of string type. The name of the field is same as the name of element. The content of the field is the same as the content of the element.