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h2. Introduction
This document is a section of the [Loader Guide|LexEVS 5.x Loader Guide]. It was formerly the LexEVS 5.0 _Supported Loaders_ guide. 

LexEVS 5.x includes the loaders listed in this document. You can also create your own loaders using the Loader Framework extension.

h2. NCI MetaThesaurus Loader

Validates and/or loads the complete NCI MetaThesaurus. Content is supplied in RRF format. Note: To load individual coding schemes, consider using the UMLS_Loader as an alternative.

h2. OBO Loader

Validates and/or loads content provided in Open Biomedical Ontologies (OBO) text format.

h2. OWL Loader

Validates and/or loads content provided in Web Ontology Language (OWL) XML format. Note that for LexEVS phase 1 this loader is designed to specifically handle the NCI Thesaurus as provided in OWL format.

h2. Text Loader

A loader for delimited text type files. Text files come in one of two formats: indented code/designation pair or indented code/designation/description triples.

h2. UMLS Loader

Load one or more coding schemes from UMLS RRF format stored in a SQL database.

h2. MetaData Loader

Validates and/or loads content provided in metadata xml format. The only requirement of the xml file is that it be a valid xml file.

h2. NCI History Loader

A loader that takes the delimited NCI history file and applies it to a coding scheme.

h2. OBO History Loader

Load an OBO change history file.

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