Introduction to the NCIP DTDs and XML Schemas Tony O’Brien Oct 2 nd 2002.

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Presentation transcript:

Introduction to the NCIP DTDs and XML Schemas Tony O’Brien Oct 2 nd 2002

DTD/XML Schema Basics Linked to Implementation Profile 1 document Provide formal, unambiguous specification of NCIP message syntax Facilitate machine (& human) parsing of NCIP messages

NCIP has 4 of them! ncip_v1_0.dtd (main DTD) ncip_v1_0.xsd (main Schema) ncip_version.dtd (‘version’ DTD) ncip_version.xsd (‘version’ Schema)

Main NCIP DTD ncip_v1_0.dtd Contains main set of 88 NCIP messages Must be supported by NCIP conformant applications Uses “datatype” attribute to provide XML- Schema-like type information

Main NCIP XML Schema ncip_v1_0.xsd Mirrors & is derived from main DTD DTD datatype attributes converted into true XML Schema datatypes Conformant apps do not currently need to support Schema …but Schema will eventually replace DTD

‘Version’ DTD ncip_version.dtd Provides ‘NCIP versions supported’ info Independent of main DTD Implemented for NCIP v1.0 ….but should remain in use as new versions of NCIP & the main DTD are developed

‘Version’ XML Schema ncip_version.xsd Mirrors & is derived from ‘version’ DTD

Location of DTD/Schema files Hosted by NISO

Top Level Structure of main DTD & XML Schema NCIPMessage is the root element Consists of 1 ‘version’ attribute and 1 child element Child element is a choice from 88 possible alternatives 88 alternatives represent 44 initiation/response message pairs These 44 ‘services’ can be further categorised:- –4 ‘lookups’eg. LookupUser/LookupUserResponse –20 ‘updates’eg. CheckOutItem/CheckOutItemResponse –20 ‘notifications’eg. ItemShipped/ItemShippedResponse

Top Level Structure of ‘Version’ DTD/Schema NCIPVersionMessage is the root element Consists of 1 ‘version’ element and 1 child element Child element is a choice from 2 alternatives Ie. A single version lookup ‘service’ –LookupVersion/LookupVersionResponse

Initiation Messages Consist of an InitiationHeader element, followed by message-specific data InitiationHeader contains:- –FromSystemId(s/v, optional) –FromSystemAuthentication(string, optional) –FromAgencyId(s/v, mandatory) –FromAgencyAuthentication(string, optional) –OnBehalfOfAgency(s/v, optional) –ToSystemId(s/v, optional) –ToAgencyId(s/v, mandatory) –ApplicationProfileType(s/v, optional)

Response messages Consist of a ResponseHeader, followed by:- –For Lookup and Update Messages: A Problem element, or response-specific data –For Notification Messages: A MessagingError element, or nothing at all ResponseHeader contains:- –FromSystemId(s/v, optional) –FromSystemAuthentication(string, optional) –FromAgencyId(s/v, mandatory) –FromAgencyAuthentication(string, optional) –ToSystemId(s/v, optional) –ToAgencyId(s/v, mandatory)

DTD/Schema data types boolean dateTime (ISO 8601) integer nonNegativeInteger positiveInteger string ‘Wrapper’ elements

Enumerated Types Scheme/Value pairs –Provides namespace for enumerations ‘Closed’: No new lists of values may be defined in a given protocol version –Example: General Processing Error ‘Open’: New lists of values may be defined without breaking protocol –Example: Agency User Privilege Type Nb. In all cases, lists specified by protocol must be supported by conformant apps

Example Scheme/Value pair s/ agencyuserprivilegetype/public.scm Adult Nb. A ‘Scheme’ element is always a URI –Guarantees globally unique list name –Does not guarantee presence of list at specified URI