**1.4.2 Digital railway core information standards**

Precondition of Digital Railway construction is to establish perfect Digital Railway information standards system. Core information standards in Digital Railway standards system include data content (including metadata) standards, data quality control standards, data exchange standards, spatial information sharing service standards, OGC (Open GIS Consortium) standard and SOA (Service Oriented Architecture) standard.

#### **1.4.2.1 Railway common spatial data content and standards**

Railway basic spatial data content and standards is a major part of spatial data management standard, including standards of railway basic spatial information, sharing professional spatial information and metadata content.

Digital Railway should establish on the base of international standards, at the same time can achieve expansion and compatibility of state metadata standards. Main reference of

development of the railway business. The traditional construction mode that deploy IT infrastructure according to business information system leads to that information and information technology resources merged into some existing rules and regulations by specialty division. Cloud computing technology provides technical capability and management scheme for construction, maintenance and management of information services and upgrade of information technology infrastructure of Digital Railway and this will improve the ability of information technology of Digital Railway. Cloud computing comes from that business change to virtualization and diversification, and those need information technology to provide business agility, resulting in needs of IT infrastructure integration, data processing tasks and services quality assurance. Cloud computing is a concept and technology system to build a dynamic IT infrastructure, information technology services and information systems architecture. Cloud computing technology offers a way of IT resources development, making information systems to support business to the changing and have dynamic capabilities. Service-oriented hierarchical information services technology, virtualization technology, massive data processing and building mode of centralized data centers in Cloud computing areas provide opportunity to realize alignment

Each system in Digital Railway collects all the physical resources and the environment status information and takes all control decisions according to state changes. State change in physical world is based on continuous model, but control decision is based on discrete model of information space. Predictive maintenance of all kinds of digital equipment in Digital Railway needs continuous and discrete mixed modeling and validation analysis technology - hybrid system modeling and verification techniques. Hybrid systems are a class of widely used computer-based systems, such as embedded systems, information physical integration systems can be considered a typical example of hybrid systems. Currently hybrid automata are the main design modeling language, and reachability test of

At present, the study of hybrid system in the railway has just started, and hybrid systems analysis, hybrid control system design will provide more reliable, more accurate techniques for the analysis, design and verification of massive information physical integration system.

Precondition of Digital Railway construction is to establish perfect Digital Railway information standards system. Core information standards in Digital Railway standards system include data content (including metadata) standards, data quality control standards, data exchange standards, spatial information sharing service standards, OGC (Open GIS

Railway basic spatial data content and standards is a major part of spatial data management standard, including standards of railway basic spatial information, sharing professional

Digital Railway should establish on the base of international standards, at the same time can achieve expansion and compatibility of state metadata standards. Main reference of

Consortium) standard and SOA (Service Oriented Architecture) standard.

**1.4.2.1 Railway common spatial data content and standards** 

of business and IT of Digital Railway.

**1.4.1.8 Hybrid system modeling and validation technology** 

it is an important way to improve the quality of the system.

**1.4.2 Digital railway core information standards** 

spatial information and metadata content.

international metadata standards in metadata standard construction of Digital Railway list as follows: ISO 19115 metadata standard, ISO 19139 metadata XML Schema implementation standard, ISO 15836 Dublin Core standard.
