Changes for page 9 Architecture for an SDMX System

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7	7	[[image:SDMX_2-1_User_Guide_draft_0-1_html_9a15e8ac68e65d15.png||data-xwiki-image-style-alignment="center" height="416" width="326"]]
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9		-This Chapter brings together the different [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] constructs described in this User Guide into a coherent architecture that supports the typical [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] use cases shown above. The architecture described here shows how applications need not be concerned with the actual XML (or [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]]) or version of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], but are concerned with interfaces offered by [[components>>doc:sdmx:Glossary.Component.WebHome]] that work with objects constructed according to the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]]
	9	+This Chapter brings together the different [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] constructs described in this User Guide into a coherent architecture that supports the typical [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] use cases shown above. The architecture described here shows how applications need not be concerned with the actual XML (or [[SDMX-EDI>>doc:Glossary.SDMX-EDI.WebHome]]) or version of [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]], but are concerned with interfaces offered by [[components>>doc:Glossary.Component.WebHome]] that work with objects constructed according to the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]]
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11		-Information Model (called [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Beans in the diagrams) which are themselves built from the actual XML (or [[SDMX-EDI>>doc:sdmx:Glossary.SDMX-EDI.WebHome]]). For data and [[metadata sets>>doc:sdmx:Glossary.Metadata set.WebHome]] the actual XML is read directly into or written directly out of the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] [[Component>>doc:sdmx:Glossary.Component.WebHome]].
	11	+Information Model (called [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Beans in the diagrams) which are themselves built from the actual XML (or [[SDMX-EDI>>doc:Glossary.SDMX-EDI.WebHome]]). For data and [[metadata sets>>doc:Glossary.Metadata set.WebHome]] the actual XML is read directly into or written directly out of the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] [[Component>>doc:Glossary.Component.WebHome]].
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13		-Such an architecture, known as a [[Component>>doc:sdmx:Glossary.Component.WebHome]] Architecture, enables applications to be built quickly and with minimal resource. As each [[Component>>doc:sdmx:Glossary.Component.WebHome]] is agnostic to the context in which it is used it can therefore be used by many applications (e.g. a Data Writer [[Component>>doc:sdmx:Glossary.Component.WebHome]] may be used in a database application, or an application reading a spreadsheet), thus reducing considerably the development effort and resulting in more robust and more easily maintained systems.
	13	+Such an architecture, known as a [[Component>>doc:Glossary.Component.WebHome]] Architecture, enables applications to be built quickly and with minimal resource. As each [[Component>>doc:Glossary.Component.WebHome]] is agnostic to the context in which it is used it can therefore be used by many applications (e.g. a Data Writer [[Component>>doc:Glossary.Component.WebHome]] may be used in a database application, or an application reading a spreadsheet), thus reducing considerably the development effort and resulting in more robust and more easily maintained systems.
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15	15	== 9.2 Architecture ==
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20	20	**{{id name="image_26"/}}Figure 26: Schematic of a Component Architecture**
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22		-The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Beans underpin the framework and are what may be referred to as ‘domain objects’, ‘data transfer objects’, or ‘business objects’. The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Beans are an Object [[representation>>doc:sdmx:Glossary.Representation.WebHome]] of the information being exchanged. The information may have been exchanged in [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]], EDI, or even CSV, it does not matter, as the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Beans are not coupled to a particular syntax or version of the standard. The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Beans are format and version independent allowing the software that uses them to be decoupled from the format in which the data/metadata are exchanged.
	22	+The [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Beans underpin the framework and are what may be referred to as ‘domain objects’, ‘data transfer objects’, or ‘business objects’. The [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Beans are an Object [[representation>>doc:Glossary.Representation.WebHome]] of the information being exchanged. The information may have been exchanged in [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]], EDI, or even CSV, it does not matter, as the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Beans are not coupled to a particular syntax or version of the standard. The [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Beans are format and version independent allowing the software that uses them to be decoupled from the format in which the data/metadata are exchanged.
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24		-Whilst “bean” objects can be created for a [[data set>>doc:sdmx:Glossary.Data set.WebHome]] or [[metadata set>>doc:sdmx:Glossary.Metadata set.WebHome]], this does not scale well for large volumes of data/metadata. Therefore, the architecture shows a data streaming approach where the data/metadata are read or written directory to/from an input or output stream – this could be a local file or streamed over the internet.
	24	+Whilst “bean” objects can be created for a [[data set>>doc:Glossary.Data set.WebHome]] or [[metadata set>>doc:Glossary.Metadata set.WebHome]], this does not scale well for large volumes of data/metadata. Therefore, the architecture shows a data streaming approach where the data/metadata are read or written directory to/from an input or output stream – this could be a local file or streamed over the internet.
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26		-The “structure” [[components>>doc:sdmx:Glossary.Component.WebHome]] use the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Beans by means of the object interfaces, thus they do not need to be concerned with the external format of the [[structural metadata>>doc:sdmx:Glossary.Structural metadata.WebHome]] – this is done by structure readers and writers.
	26	+The “structure” [[components>>doc:Glossary.Component.WebHome]] use the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Beans by means of the object interfaces, thus they do not need to be concerned with the external format of the [[structural metadata>>doc:Glossary.Structural metadata.WebHome]] – this is done by structure readers and writers.
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28		-For [[data sets>>doc:sdmx:Glossary.Data set.WebHome]] and [[metadata sets>>doc:sdmx:Glossary.Metadata set.WebHome]] there are no “beans” but rather the data/metadata are input to/output from the data and metadata readers and writers.
	28	+For [[data sets>>doc:Glossary.Data set.WebHome]] and [[metadata sets>>doc:Glossary.Metadata set.WebHome]] there are no “beans” but rather the data/metadata are input to/output from the data and metadata readers and writers.
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30	30	== 9.3 Using the Architecture ==
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43	43	(% style="text-align: center;" %)
44	44	**{{id name="image_28"/}}Figure 28: Applications Integrated with a Component Architecture**
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46		-A [[Component>>doc:sdmx:Glossary.Component.WebHome]] Architecture enables the [[components>>doc:sdmx:Glossary.Component.WebHome]] to be shared by many applications thus reducing development and maintenance effort and resulting in a more robust system.
	46	+A [[Component>>doc:Glossary.Component.WebHome]] Architecture enables the [[components>>doc:Glossary.Component.WebHome]] to be shared by many applications thus reducing development and maintenance effort and resulting in a more robust system.
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48	48	== 9.4 Availability of Component Architectures ==
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50		-[[Component>>doc:sdmx:Glossary.Component.WebHome]] Architectures based on the schematic depicted above are beginning to emerge as freely available [[components>>doc:sdmx:Glossary.Component.WebHome]] or open source. The [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] Tools Database (accessible from the [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] website at [[__www.sdmx.org__>>url:http://www.sdmx.org/]]) contains details of many [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]] tools including complete architectures.
	50	+[[Component>>doc:Glossary.Component.WebHome]] Architectures based on the schematic depicted above are beginning to emerge as freely available [[components>>doc:Glossary.Component.WebHome]] or open source. The [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] Tools Database (accessible from the [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] website at [[__www.sdmx.org__>>url:http://www.sdmx.org/]]) contains details of many [[SDMX>>doc:Glossary.Statistical data and metadata exchange.WebHome]] tools including complete architectures.