The character string if the length of the lexical value is greater than 4000 bytes. (The use of this column may change in a future release.) Used for collision handling for the canonical lexical value. Used for collision handling for the lexical value. The ID for the canonical lexical value for the current lexical value. Language tag (for example, fr for French) for a literal with a language tag (that is, if VALUE_TYPE is or Otherwise, this column has a null value. For example, for a row representing a creation date of, the VALUE_TYPE column can contain TL, and the LITERAL_TYPE column can contain. For the lexical value mentioned in the description of the VNAME_PREFIX column, the suffix is type.įor typed literals, the type information otherwise, null. The SEM_APIS.VALUE_NAME_SUFFIX function can be used for suffix computation. If the length of the lexical value is 4000 bytes or less, this column stores a suffix of a portion of the lexical value. For example, the prefix for the portion of the lexical value without the angle brackets is. The SEM_APIS.VALUE_NAME_PREFIX function can be used for prefix computation. If the length of the lexical value is 4000 bytes or less, this column stores a prefix of a portion of the lexical value. A long literal is a literal with more than 4000 bytes. Possible values: UR for URI, BN for blank node, PL for plain literal, for plain literal with a language tag, PLL for plain long literal, for plain long literal with a language tag, TL for typed literal, or TLL for typed long literal. The type of text information stored in the VALUE_NAME column. Unique value ID number, automatically generated.
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Table 1-3 MDSYS.RDF_VALUE$ Table Columns Column Name (It is currently a computed column, and its definition may change in a future release.) Null indicates the default graph (see Section 1.3.9, "Named Graphs"). The VALUE_ID for the text value of the graph name for the triple. (Reserved column can be used for fine-grained access control) The ID for the RDF model to which the triple belongs. The VALUE_ID for the text value of the object of the triple The VALUE_ID for the text value of the canonical form of the object of the triple.
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The VALUE_ID for the text value of the subject of the triple. The VALUE_ID for the text value of the predicate of the triple. Table 1-2 MDSYS.SEMM_model-name View Columns Column Name Section 1.12, "Software Naming Changes for Semantic Technologies"įor information about OWL concepts and the Oracle Database support for OWL capabilities, see Chapter 2. Section 1.11, "Semantic Data Examples (PL/SQL and Java)" Section 1.10, "Quick Start for Using Semantic Data" Section 1.8, "Using Semantic Network Indexes" Section 1.7, "Loading and Exporting Semantic Data" Section 1.6, "Using the SEM_MATCH Table Function to Query Semantic Data" Section 1.5, "Semantic Data Types, Constructors, and Methods" Section 1.4, "Semantic Metadata Tables and Views" Section 1.3, "Semantic Data in the Database" Section 1.1, "Introduction to Oracle Semantic Technologies" This chapter contains the following major sections: However, the use of RDF and OWL is not restricted to spatial data. The RDF and OWL support are features of Oracle Spatial, which must be installed for these features to be used. The PL/SQL subprograms for working with semantic data are in the SEM_APIS package, which is documented in Chapter 9.
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įor information about OWL, see the OWL Web Ontology Language Reference at. This chapter does not explain these concepts in detail, but focuses instead on how the concepts are implemented in Oracle.įor an excellent explanation of RDF concepts, see the World Wide Web Consortium (W3C) RDF Primer at. It assumes that you are familiar with the major concepts associated with RDF and OWL, such as triples, URIs, blank nodes, plain and typed literals, and ontologies. This chapter describes the support in Oracle Database Enterprise Edition for semantic technologies, specifically Resource Description Framework (RDF) and a subset of the Web Ontology Language (OWL). 1 Oracle Database Semantic Technologies Overview