Xpath service Getting data out of XML Aleksandra Pawlik materials by Katy Wolstencroft University of Manchester 1.

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Xpath service Getting data out of XML Aleksandra Pawlik materials by Katy Wolstencroft University of Manchester 1

The Basics of XML XML – eXtensible Markup Language Designed for the storage and transport of data This includes passing data between services or retrieving data from a Web page Provides a machine readable dataset Many service providers export data in XML 2

Example <?xml version="1.0"?> <note> <to>Katy</to> <from>Helen</from> <heading>Reminder</heading> <body>Don't forget about Bonn Trip!</body> </note> The following website has lost of information about XML and tutorials: http://www.w3schools.com/xml

Extracting XML Elements Often, we need to extract particular elements of the XML to feed into the next services in the workflow Taverna has a dedicated service to help you do this Go to the service panel and find “Xpath Service” in the Service Templates section. We will use this service to explore the contents of an SBML file from the BioModels database, but first we need to find the BioModels services

Extracting XML Elements from SBML SBML is the Systems Biology Mark-up Language. It is the community standard for describing systems biology models SBML models contain information about the reactions between enzymes, genes, and metabolites, and their interactions in living systems Well-annotated SBML models will contain descriptions of model entities and official IDs to link those entities back to their sources (e.g. Uniprot IDs for proteins/enzymes, KEGGIDs or ReactomeIDs for reactions etc)

Extracting XML Elements from SBML We will find all the BioModels constructed in yeast (Saccharomyces cerevisiae), and find the publications about them In Biocatalogue, search for the ‘BioModels’: getModelsIDByTaxonomy getModelSBMLByID And add these services to the Service Panel

Extracting XML Elements from SBML Add a Text_constant (rename the service to TaxonomySearch) and connect it with getModelsIdByTaxonomy Then connect the output (Return) from getModelsIdByTaxonomy with the input for getModelSBMLById Create an output port

Extracting XML Elements from SBML The workflow should look like this

Extracting XML Elements from SBML As the input value enter Saccharomyces cerevisiae Run the workflow and save one of the SBML models as an XML file

Extracting XML Elements from SBML Now import the Xpath Service from Taverna In the pop-up window, enter the path to the saved SBML file and click the green arrow to load it into the service By expanding the + icons, you can explore the file Expand the XML under ‘annotation’, until you reach RDF:resource

Extracting XML Elements from SBML Click on ‘Generate Xpath From Expression’ Then Click on ‘Run Xpath’ and click ‘Apply’ This service will now pull out all the reactions from each model

Extracting XML Elements from SBML Connect it to the output of ‘getModelSBMLByID’ Add an output port to the Xpath service Save and run the workflow again

Extracting XML Elements from SBML We can change the output of the Xpath service into a flattened list Go to the Services Panel and add a Flatten List (from “list”)

Extracting XML Elements from SBML Connect the output of the Xpath service to the “Flatten List” Connect the output of the “Flatten List” with the output port