CN110347736A - A kind of data self mapping method towards RDF triple - Google Patents
A kind of data self mapping method towards RDF triple Download PDFInfo
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- G06F16/22—Indexing; Data structures therefor; Storage structures
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Abstract
A kind of data self mapping method towards RDF triple, includes the following steps: Step 1: obtaining relational database data；Step 2: database table structure and data are directly output as RDF graph using Direct Mapping mapping language；Specific database structure and vocabulary are customized using R2RML mapping language, and data relationship library is exported as RDF data collection；Step 3: using Direct Mapping mapping language as default mapping scheme, using R2RML as personalized customization scheme.Direct Mapping mapping language provides the initial rules of machine automatic conversion in the present invention, R2RML provides artificial customized logical framework and syntax rule, two kinds of mapping modes complement one another, the data in relational database to be preferably converted to the triple data of RDF.
Description
Technical field
The present invention relates to technical field of data processing more particularly to a kind of data self mappings towards RDF triple
Method.
Background technique
Resource description framework (Resource Description Framework) is a kind of for describing Web resource
Markup language.RDF is XML (subset of the standard generalized markup language) application of a processing metadata, and so-called metadata is exactly
" data of description data " or " information of description information ".
When the relational database containing structuring historical data to be dissolved into knowledge mapping, relation data is directly used
Library is clearly inappropriate, demand when relational database is not able to satisfy applied to knowledge mapping, need to will be in relational database
Data be converted to RDF triple data according to mapping relations, preferably to describe and apply data.Moreover, being reflected using single
It penetrates mode and the data in relational database is converted into RDF triple data with certain limitation, it cannot be according to user's need
Ask carry out personalized customization.
Summary of the invention
(1) goal of the invention
To solve technical problem present in background technique, the present invention proposes that a kind of data towards RDF triple are made by oneself
Benefit film showing shooting method, Direct Mapping mapping language provide the initial rules of machine automatic conversion, and R2RML is provided manually certainly
The logical framework and syntax rule of definition, two kinds of mapping modes complement one another, preferably to turn the data in relational database
It is changed to the triple data of RDF.
(2) technical solution
To solve the above problems, the present invention provides a kind of data self mapping methods towards RDF triple, including
Following steps:
Step 1: obtaining relational database data；
Step 2: database table structure and data are directly output as RDF using Direct Mapping mapping language
Figure；Specific database structure and vocabulary are customized using R2RML mapping language, and data relationship library is exported as RDF data collection；
Step 3: using Direct Mapping mapping language as default mapping scheme, using R2RML as personalized customization
Scheme.
Preferably, the raw material to be worked using " input database " as R2RML processor；Using R2RML mapped file as
The foundation of R2RML processor work；" output database " output is addressable according to R2RML mapped file by R2RML processor
Retrievable " output data set ".
Preferably, in " output data set " of R2RML, R2RML includes two kinds of processing modes to empty node, specifically such as
Under:
The first: is when same empty node identifier comes across in multiple triples in same RDF graph, multiple ternary
Group shares same empty node；
Second: when same empty node identifier comes across in multiple RDF graphs, which cannot be by different RDF
Figure shares.
Preferably, R2RML is automatically generated according to the mapping mode of Direct Mapping using R2RML processor to map
File, then follow the customized R2RML mapped file of R2RML grammer.
Preferably, in the frame that " logical table " is mapped as RDF by utilization " triple mapping ", utilize " main body mapping " fixed
Adopted main body utilizes " mapping of predicate object " to define predicate and object.
Preferably, it is mapped using the RDB2RDF for including Direct Mapping mapping language and R2RML mapping language
Language is on any one workbench in RDF-RDB2RDF, XSPARQL, Ultrawrap and db2triples by database
Data output is RDF data collection.
Above-mentioned technical proposal of the invention has following beneficial technical effect: for that will contain the pass of structuring historical data
It is that database is dissolved into knowledge mapping, data model is used as using resource description framework (RDF), by the data of relational database
Be converted to the triple data of RDF.In specific conversion process, directly reflected using Direct Mapping mapping language
Penetrate, in the RDF graph using the output of this kind of mapping mode, table name in term and relational database for indicating class and predicate and
Field name is consistent；The mapping that personalized customization is carried out using R2RML mapping language is exported using this kind of mapping mode
RDF data is concentrated, and the title of the term used such as class, predicate are both from existing vocabulary；Direct Mapping mapping
Language provides the initial rules of machine automatic conversion, and R2RML provides artificial customized logical framework and syntax rule, and two kinds reflect
The mode of penetrating complements one another, the data in relational database to be preferably converted to the triple data of RDF.
Detailed description of the invention
Fig. 1 is a kind of structure flow chart of the data self mapping method towards RDF triple proposed by the present invention.
Fig. 2 is the work of R2RML in a kind of data self mapping method towards RDF triple proposed by the present invention
Mechanism structure schematic diagram.
Fig. 3 is to reflect " logical table " in a kind of data self mapping method towards RDF triple proposed by the present invention
Penetrate the realization circuit theory schematic diagram for RDF.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured
The concept of invention.
As shown in Figure 1-3, a kind of data self mapping method towards RDF triple proposed by the present invention, including such as
Lower step:
Step 1: obtaining relational database data；
Step 2: database table structure and data are directly output as RDF using Direct Mapping mapping language
Figure；Specific database structure and vocabulary are customized using R2RML mapping language, and data relationship library is exported as RDF data collection；
Step 3: using Direct Mapping mapping language as default mapping scheme, using R2RML as personalized customization
Scheme.
In the present invention, for the relational database containing structuring historical data to be dissolved into knowledge mapping, using resource
Describing framework (RDF) is used as data model, and the data of relational database are converted to the triple data of RDF.It is specific converted
Cheng Zhong is directly mapped using Direct Mapping mapping language, in the RDF graph using the output of this kind of mapping mode,
Table name in term and relational database and field name for indicating class and predicate are consistent；Utilize R2RML mapping language
The mapping for carrying out personalized customization is concentrated using the RDF data of this kind of mapping mode output, the title of the term used such as class,
Predicate is both from existing vocabulary；Direct Mapping mapping language provides the initial rules of machine automatic conversion,
R2RML provides artificial customized logical framework and syntax rule, two kinds of mapping modes complement one another, preferably by relationship number
The triple data of RDF are converted to according to the data in library.
In an alternative embodiment, the raw material to be worked using " input database " as R2RML processor；With
The foundation that R2RML mapped file works as R2RML processor；R2RML processor will " output number according to R2RML mapped file
According to library " it exports to may have access to retrievable " output data set ".
It should be noted that R2RML working mechanism includes " input database ", R2RML mapped file and R2RML processing
Totally three elements, three elements provide the triple data that the data in relational database are converted to RDF to necessity for R2RML to device
It supports.
In an alternative embodiment, in " output data set " of R2RML, R2RML includes two kinds to empty node
Processing mode, specific as follows:
The first: is when same empty node identifier comes across in multiple triples in same RDF graph, multiple ternary
Group shares same empty node；
Second: when same empty node identifier comes across in multiple RDF graphs, which cannot be by different RDF
Figure shares.
It should be noted that according to two kinds of concrete conditions, using the different processing modes for empty node.
In an alternative embodiment, automatic according to the mapping mode of Direct Mapping using R2RML processor
R2RML mapped file is generated, then follows the customized R2RML mapped file of R2RML grammer.
In an alternative embodiment, in the frame that " logical table " is mapped as RDF by utilization " triple mapping ",
It utilizes " main body mapping " to define main body, " mapping of predicate object " is utilized to define predicate and object.
It should be noted that the RDF triple is shared same by " main when " logical table " is mapped as RDF triple
The main body that body mapping " defines.
In an alternative embodiment, using including Direct Mapping mapping language and R2RML mapping language
RDB2RDF mapping language in RDF-RDB2RDF, XSPARQL, Ultrawrap and db2triples any one work
Database data is exported as RDF data collection on platform.
It should be noted that above-mentioned workbench can be implemented Direct Mapping and R2RML standard criterion, moreover,
Implementation includes ETL mode and dynamic translation mode.It, can be according to mapping predetermined, by relation data for ETL mode
Library generates static state RDF packet；It, can be according to foreground request and mapping predetermined, by relational database for dynamic translation mode
RDF data made of data conversion is back to foreground.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention
Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing
Change example.
Claims (6)
1. a kind of data self mapping method towards RDF triple, which comprises the steps of:
Step 1: obtaining relational database data；
Step 2: database table structure and data are directly output as RDF graph using Direct Mapping mapping language；It utilizes
R2RML mapping language customizes specific database structure and vocabulary, and data relationship library is exported as RDF data collection；
Step 3: using Direct Mapping mapping language as default mapping scheme, using R2RML as personalized customization side
Case.
2. a kind of data self mapping method towards RDF triple according to claim 1, which is characterized in that with
The raw material that " input database " works as R2RML processor；It works using R2RML mapped file as R2RML processor
Foundation；" output database " output may have access to retrievable " output data according to R2RML mapped file by R2RML processor
Collection ".
3. a kind of data self mapping method towards RDF triple according to claim 2, which is characterized in that
In " output data set " of R2RML, R2RML includes two kinds of processing modes to empty node, specific as follows:
The first: when same empty node identifier comes across in multiple triples in same RDF graph, multiple triple is total
With same empty node；
Second: when same empty node identifier comes across in multiple RDF graphs, which cannot be total to by different RDF graphs
With.
4. a kind of data self mapping method towards RDF triple according to claim 2, which is characterized in that benefit
R2RML mapped file is automatically generated according to the mapping mode of Direct Mapping with R2RML processor, then follows R2RML language
The customized R2RML mapped file of method.
5. a kind of data self mapping method towards RDF triple according to claim 1, which is characterized in that
It utilizes " triple mapping " that " logical table " is mapped as in the frame of RDF, " main body mapping " is utilized to define main body, utilize " predicate
Object mapping " defines predicate and object.
6. a kind of data self mapping method towards RDF triple according to claim 1, which is characterized in that benefit
With include Direct Mapping mapping language and R2RML mapping language RDB2RDF mapping language RDF-RDB2RDF,
Database data is exported as RDF data on any one workbench in XSPARQL, Ultrawrap and db2triples
Collection.
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Cited By (2)
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| CN111813798A (en) * | 2020-07-10 | 2020-10-23 | 中国医学科学院医学信息研究所 | Mapping method, device, device and storage medium based on R2RML standard |
| CN116304217A (en) * | 2023-03-31 | 2023-06-23 | 易智瑞信息技术有限公司 | Geospatial data query method, apparatus, electronic device, and readable storage medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111813798A (en) * | 2020-07-10 | 2020-10-23 | 中国医学科学院医学信息研究所 | Mapping method, device, device and storage medium based on R2RML standard |
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| CN116304217A (en) * | 2023-03-31 | 2023-06-23 | 易智瑞信息技术有限公司 | Geospatial data query method, apparatus, electronic device, and readable storage medium |
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Application publication date: 20191018 |