On Tue, Mar 1, 2016 at 7:34 PM, Sohani Weerasinghe <soh...@wso2.com> wrote:
> Hi All, > > If we consider an XML which has multiple namespaces as below , > > <root> > <h:table xmlns:h="http://www.w3.org/TR/html4/";> > <h:name>Asian Coffee Table</h:name> > <h:width>74</h:width> > <h:length>129</h:length> > </h:table> > <f:table xmlns:f="http://www.w3schools.com/furniture";> > <f:name>African Coffee Table</f:name> > <f:width>80</f:width> > <f:length>120</f:length> > </f:table> > </root> > > The avro schema should be as follows , > > { > "type" : "record", > "name" : "root", > "fields" : [ { > "type" : "record", > "name" : "tableRecord", > * "doc" : "http://www.w3.org/TR/html4/ > <http://www.w3.org/TR/html4/>",* > "namespace" : "http://www.w3.org/TR/html4/"; > "fields" : [ { > "name" : "name", > "type" : [ "null", "string" ] > "doc" : "http://www.w3.org/TR/html4/"; > } , { > "name" : "width", > "type" : [ "null", "int" ] > },{ > "name" : "length", > "type" : [ "null", "int" ] > }] > }, { > "type" : "record", > "name" : "tableRecord", > * "doc" : "http://www.w3schools.com/furniture > <http://www.w3schools.com/furniture>",* > "namespace" : "http://www.w3schools.com/furniture"; > "fields" : [ { > "name" : "name", > "type" : [ "null", "string" ] > } , { > "name" : "width", > "type" : [ "null", "int" ] > },{ > "name" : "length", > "type" : [ "null", "int" ] > }] > } ] > } > > When representing this using the Visual DataMapper Editor, in order to > differentiate the two records, we can add a namespace prefix to the name of > the record as shown below. > > > ​But when generating the Avro Schema, if we pass this value as the name of > the node it throws *org.apache.avro.SchemaParseException: Illegal > character in: y:tableRecord.* > AVRO name should start with [A-Za-z] and subsequently contain only [A-Za-z0-9_]. So we can not pass name with namespace prefix. > > So, if we use only the name (tableRecord, by removing the prefix) to > create the avro schema, how are we going to differentiate the records > separately when generating the mapping config? > We should add above xml namespace prefix as the namespace of AVRO record. Then two elements can be differentiated. For Eg: { "type" : "record", "name" : "root", "fields" : [ { "type" : "record", "name" : "tableRecord", * "doc" : "http://www.w3.org/TR/html4/ <http://www.w3.org/TR/html4/>",* "namespace" : "N1", "fields" : [ { "name" : "name", "type" : [ "null", "string" ], "doc" : "http://www.w3.org/TR/html4/"; } , { "name" : "width", "type" : [ "null", "int" ], "doc" : "http://www.w3.org/TR/html4/"; },{ "name" : "length", "type" : [ "null", "int" ], "doc" : "http://www.w3.org/TR/html4/"; }] }, { "type" : "record", "name" : "tableRecord", * "doc" : "http://www.w3schools.com/furniture <http://www.w3schools.com/furniture>",* "namespace" : "N2", "fields" : [ { "name" : "name", "type" : [ "null", "string" ], *"doc" : "http://www.w3schools.com/furniture <http://www.w3schools.com/furniture>"* } , { "name" : "width", "type" : [ "null", "int" ] *"doc" : "http://www.w3schools.com/furniture <http://www.w3schools.com/furniture>"* },{ "name" : "length", "type" : [ "null", "int" ], *"doc" : "http://www.w3schools.com/furniture <http://www.w3schools.com/furniture>"* }] } ] } Then the full names of the two tableRecords will be N1.tableRecord and N2.tableRecord and AVRO can differentiate these two fields. > > eg: If we are to map a field in y:tableRecord with a field > in y:tableRecord etc. How can we differentiate this? > > This usecase of having multiple namespaces can be displayed graphically in > the Design view by appending a namespace prefix, but it seems this will > have issues in generating the avro schema and the mapping config. > Mapping configuration does not need to be aware of the namespaces as long as they can be differentiate in the diagram. Output from the mapping will look into the output schema and will build the output message with desired namespaces. > > Your suggestions are highly appreciated. > > Thanks, > Sohani > Sohani Weerasinghe > Software Engineer > WSO2, Inc: http://wso2.com > > Mobile : +94 716439774 > Blog :http://christinetechtips.blogspot.com/ > Twitter : https://twitter.com/sohanichristine > -- ---------------------------------------------------------- *Nuwan Chamara Pallewela* *Software Engineer* *WSO2, Inc. *http://wso2.com *lean . enterprise . middleware* Email *nuw...@wso2.com <nuw...@wso2.com>* Mobile *+94719079739@*
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