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253 bytes added ,  11:14, 26 September 2018
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''In the context of information retrieval, a thesaurus (plural: "thesauri") is a form of controlled vocabulary that seeks to dictate semantic manifestations of metadata in the indexing of content objects. A thesaurus serves to minimise semantic ambiguity by ensuring uniformity and consistency in the storage and retrieval of the manifestations of content objects. ANSI/NISO Z39.19-2005 defines a content object as "any item that is to be described for inclusion in an information retrieval system, website, or other source of information". The thesaurus aids the assignment of preferred terms to convey semantic metadata associated with the content object''. ([https://en.wikipedia.org/wiki/Thesaurus_(information_retrieval) wikipedia])
 
''In the context of information retrieval, a thesaurus (plural: "thesauri") is a form of controlled vocabulary that seeks to dictate semantic manifestations of metadata in the indexing of content objects. A thesaurus serves to minimise semantic ambiguity by ensuring uniformity and consistency in the storage and retrieval of the manifestations of content objects. ANSI/NISO Z39.19-2005 defines a content object as "any item that is to be described for inclusion in an information retrieval system, website, or other source of information". The thesaurus aids the assignment of preferred terms to convey semantic metadata associated with the content object''. ([https://en.wikipedia.org/wiki/Thesaurus_(information_retrieval) wikipedia])
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The purpose of the thesaurus is have a list of ingredients, that occur in ingredient lists, that are unique and are well defined. The OFF ingredients taxonomy is mainly a list of elements that occur in ingredient lists. However it is more
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The purpose of the thesaurus is have a list of ingredients, that occur in ingredient lists, that are unique and are well defined. The OFF ingredients taxonomy is mainly a list of elements that occur in ingredient lists. However the OFF Ingredients taxonomy is more than a simple thesaurus.
    
=== Example ===
 
=== Example ===
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=== Specification ===
 
=== Specification ===
 
Producers sometimes try to shorten the length of ingredients lists by suppressing repetition. For instance the entry ''vegetable fats (palm, sunflower)'' should actually be read as two elements: ''palm vegetable fat'' and ''sunflower vegetable fat''. In this case the parentheses act as method to avoid repetition.
 
Producers sometimes try to shorten the length of ingredients lists by suppressing repetition. For instance the entry ''vegetable fats (palm, sunflower)'' should actually be read as two elements: ''palm vegetable fat'' and ''sunflower vegetable fat''. In this case the parentheses act as method to avoid repetition.
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=== Practice ===
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Some experiences have been gathered in building the OFF taxonomy.
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* Gathering - the first step is parsing the ingredient lists and  ingredient entries - @stephane does this
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* Merging
    
== Ontology building ==
 
== Ontology building ==
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