Now that you have created views, you can query the data that is … - Selection from Writing and Querying MapReduce Views in CouchDB [Book] For example, there is a data set of large employee records of multiple companies. Again, let’s query for all car objects in our database using a rich query. I guess that the index must have some problem, but do not know how to verify if index is used by the query. CouchDB uses HTTP requests to populate or query the database, so we could just write HTTP PUT requests to do this. To get the first 10 documents from your db you can use the limit query option. Planet CouchDB; Libraries and Tools; Contributing; Project affairs; Release Management; Professional Services; 5 more child pages. Returns one row at a time until the end or until it hits endkey, if present. Most of the chaincode shim APIs can be utilized with either LevelDB or CouchDB state database, e.g. Hyperledger Fabric uses state databases to store the ledger records in the World State. CouchDB delegates computation of design documents functions to external query servers. Once CouchDB is running you should be able to access … No results with rich query - Hyeperledger Fabric v1.0. This will result in the method being run on a single Hyperledger Fabric Peer and will not result in any interaction with the Orderer. All queries are just jsons which are parsed to be a string, this can be done by using this online tool. So a query with a key range targets a contiguous block of data from the database. CouchDB is an optional, alternate state database that allows you to model data on the ledger as JSON and issue rich queries against data values rather than the keys. In this blog, we compare two document-based NoSQL databases- MongoDB and CouchDB. For example — The employee John Doe records needs to be queried among all records. Currently there are several libraries for Python to connect to CouchDB. Find employees of a company with “Manager” occupation with a maximum salary. It is used to processes all design functions calls: views, shows, lists, filters, updates and validate_doc_update. GetState, PutState, GetStateByRange, GetStateByPartialCompositeKey.Additionally when you utilize CouchDB as the state database and model assets as JSON in chaincode, you can perform rich queries against the JSON in the state … The 5 most important differences between CouchDB and MongoDB are: Queries: CouchDB accepts queries via a RESTful HTTP API, while MongoDB has its own query language. limit: Like any other querying language, you are able to limit the amount of records to return. Fauxton is continuously being improved, so there may be slight differences in the examples in this document vs the latest and greatest Fauxton on npm.. It uses JSON, to store data (documents), java script as its query language to transform the documents, http protocol for api to access the documents, query the indices with the web browser. Glynn Bird. Chaincode Rich Queries. Measure the execution-time of the Fabric rich-query when using CouchDB as state database. Use fabric-sample's fabcar chaincode, test how many time a query costs using couchdb's rich query method. Because of that CouchDB can serve up a key range very efficiently. CouchDB vs MongoDB. So, we will create the composite key with email which map as unique key for John Doe record. Apache CouchDB is an open-source document-oriented NoSQL database, implemented in Erlang.. CouchDB uses multiple formats and protocols to store, transfer, and process its data, it uses JSON to store data, JavaScript as its query language using MapReduce, and HTTP for an API.. CouchDB was first released in 2005 and later became an Apache Software Foundation project in 2008. LevelDB stores the records in key-value pair whereas CouchDB stores records in JSON format with the rich query to the data collection. Most of the chaincode shim APIs can be utilized with either LevelDB or CouchDB state database, e.g. The query string follows the CouchDB JSON query syntax. The indexing technique makes particular query even further accurate and faster, However, indexing is not that necessary to deploy in all data collection but becomes extremely handy against huge data set involving complex queries. sort: You are able to sort every individual field in “asc” or “desc” order. This is largely deliberate as the fully relational model is hard to scale.. One method to improve things (and provide the ability to sort by value) is to introduce chained MapReduce (currently only available on cloudant).. fields: You can filter out unnecessary or forbidden fields. … In its internal representation indexes are always sorted by key. CouchDB operates in a docker container, so for installing CouchDB for your network, you need to download CouchDB docker images. There is an added advantage by creating indexing JSON files to make CouchDB query even more accurate. The whole CouchDB query documentation can be found here. There are a few available but I’ve gone for Cradle in this example as it … Just like MongoDB, you can use $gt, $lt,$eq … the full list can be found here. The focus is on the ease of use, embracing the web. skip: You’ll be able to leave out the first X records. The developer can package the indexes either during installation or instantiation of chaincode. for this employee record model, if there will be 100,000+ data collection, then it’s quite challenging to perform complex queries from CouchDB. I’m going to simplify things even further though by using a 3rd party module to help. A view is … assets) are modeled as JSON data. But if you have more complex data, getting specific data based on fields is impossible. But what if you want to aggregate on different things? Temporary queries. Instead CouchDB is a collection of JSON documents. A full implementation with chaincode will be included at the end. One thing CouchDB does to help with this is let you use a complex key, to provide different levels of aggregation of your data. When you pass it your query above, make sure your escape (useful tool for this) it into a string so it looks like this: The GetQueryResult function will return an iterator. The current version of Futon doesn’t let you specify a range for your query, nor does it allow you to ask CouchDB to include the original document in your results, although Futon does provide a hyperlink to a representation of that document. But there’s a solution (for some occasions)! Use fabric-sample's fabcar chaincode, test how many time a query costs using couchdb's rich query method. The docker-compose command will download the required CouchDB images for the docker container. Both LevelDB and CouchDB support core chaincode operations such as getting and setting a key (asset), and querying based on keys. Paginated Rich Query. Mango queries support pagination via the bookmark field. Important note for those writing tests for their chaincode: The MockStub used for testing does not implement the GetQueryResult method. Oracle Blockchain Platform supports two types of rich query syntax that you can use to query the state database: SQL rich query and CouchDB rich query. This will result in the method being run on a single Hyperledger Fabric Peer and will not result in any interaction with the Orderer. See the introduction, technical overview for more information, or learn what’s new in 3.1. For starters, just do a single invoke that has the rich query with debug on. CouchDB has a really nice and simple HTTP protocol, so we are not going to use any CouchDB specific library. CouchDB comes with a developer-friendly query language, and optionally MapReduce for simple, efficient, and comprehensive data retrieval. This allowed Cloudant Query and Mango Query to become synchronized. Entwicklungsgeschichte. While the HLF team has improved their documentation since 1.0-alpha, I couldn’t seem to find much examples on how this rich querying works. In this index, the query will sort particular result with “salary”, “occupation” for a “company”. In addition, the same two-step procedure is followed. Whether the producer should be started lazy (on the first message). Using CouchDB from Chaincode¶. Get in touch https://theledger.be, // example curl definition for use with command line, curl -i -X POST -H “Content-Type: application/json” -d “{\”index\”:{\”fields\”:[{\”data.size\”:\”desc\”},{\”chaincodeid\”:\”desc\”},{\”data.docType\”:\”desc\”},{\”data.owner\”:\”desc\”}]},\”ddoc\”:\”indexSizeSortDoc\”, \”name\”:\”indexSizeSortDesc\”,\”type\”:\”json\”}”, https://jira.hyperledger.org/browse/FAB-2809, http://docs.couchdb.org/en/2.1.0/api/database/find.html?highlight=find, Deploying test environments with Azure DevOps, EKS and ExternalDNS, Demo of Three-Node Two-Channel Setup in Hyperledger Fabric, Data Processing Pipeline for a Personal Memex, Multi-Host Deployment for First Network (Hyperledger Fabric v2), Understanding First Network Example in Hyperledger Fabric (Part 1), Searching for the marble store owned by tom, Searching for marbles with size greater than 1, Searching for specific marble colors in stores, Searching for an array of marble colors in stores. Database Queries the CouchDB Way. Das Beispiel aus [3.1] k onnte um ein zus atzliches Feld Album erweitert werden, welches die ID eines ande- ren Dokuments enth alt. You are ready to begin. If it has any items, it will return a struct that looks something like this. Now, we have learned to write more advanced queries, let’s use this new knowledge in our chaincode to retrieve data. It has no rows or tables. Instead we are going to use request which is a library to easily make any http requests. CouchDB wird seit 2005 von Damien Katz entwickelt, der vorher als Senior Developer an Lotus Notes gearbeitet hatte. The Developer Preview release of CouchDB 2.0 delivers on our goal of bringing Apache CouchDB to the enterprise. Querying Views In Chapter 3 we saw how to save views to a design document. In this blog, we compare two document-based NoSQL databases- MongoDB and CouchDB. So, here the collection will map with only “occupation” field and will return with a list of “Software Engineer” of all companies. CouchDB is essentially a JSON document based collection database. It is a NoSQL document store database. Both LevelDB & CouchDB can store binary data and can be interacted with using the chaincode. See the introduction, technical overview for more information, or learn what’s new in 3.1. CouchDB is an open source database developed by Apache software foundation. Queries: In CouchDB, queries use map-reduce functions which can be a difficult concept to master for people with an SQL background. This object store holds binary data which can be queried using its key. Also, from the comparisons, it is clear that if the application requires more efficiency and speed, then MongoDB is a better choice rather than CouchDB. Paginated Rich Query. But I don't get any result (no error), just an empty array. Key elements of CouchDB's design have proven instrumental to success at this scale, including version histories, append-only storage, and multi-master replication. The Couch Replication Protocol is implemented in a variety of projects and products that span every imaginable computing environment from globally distributed server-clusters, over mobile phones to web browsers. As I understand it, what you’re referring to is how expansive the querying language is. The View to Get Comments for Posts. By default fabric uses a LevelDB store which is included in the peer process. It’s even possible to use regex to filter for data, however, limit the use to only basic regex queries due to performance reasons. To use indexes in _find you have to create a Mango language index through the _index endpoint. But I don't get any result (no error), just an empty array. Some database systems forgo joins and unions (and other higher-level querying capabilities) and pare down their language towards get/set offerings. You can get pretty far with complex keys if you know the order of things you want to query. It’s very simple. 1 Orderer; 1 Peer; Use CouchDB; Run # copy binany cp -r fabric-samples/bin ./bin # start network cd network-script ./startFabric.sh # run bench app cd bench go run . Views are best managed as a folder structure in the filesystem. CouchDB started reading at the bottom of the view and went backward until it hit endkey. I guess that the index must have some problem, but do not know how to verify if index is used by the query. I was also confused by this feature. Besides that, it’s not difficult to implement these rich queries into chaincode as the StubHelper does all the hard work. The “first network” sample project also contains a configuration with CouchDB included. Both LevelDB and CouchDB support core chaincode operations such as getting and setting a key (asset), and querying based on keys. Whenever you query a view, this is how CouchDB operates: Starts reading at the top, or at the position that startkey specifies, if present. Temporary queries are very slow, and we only recommend them for quick debugging during development. In a performance test using CouchDB, GetState by primary key can get 200 TPS, but rich query on an indexed field gets only 7 TPS. The first thing to understand is that you don't need map/reduce queries if you merely want to look up documents by _id or sort them by _id. The key-value pair based indexed data-store is less efficient compared to JSON based collection model against large data set. camel.component.couchdb.lazy-start-producer. Every peer has CouchDB and I have follow example in marble source code. in CouchDB kein eingebauter Mechanismus um Verkn up-fungen zwischen Dokumenten herzustellen. py-couchdb is a BSD Licensed, modern pure Python CouchDB client. I am just wondering if such a query is possible in couchdb. An overview of the main parametric comparisons between these two databases.Major differences include the replication method and platform support. MongoDB: Queries: MongoDB is closer to SQL, and as a result will probably be easier for users with SQL experience to get up to speed. GetState, PutState, GetStateByRange, GetStateByPartialCompositeKey.Additionally when you utilize CouchDB as the state database and model assets as JSON in chaincode, you can perform rich queries against the JSON in the state database by … Apache CouchDB® lets you access your data where you need it. We will be using the getQueryResultAsList function from the stubHelper that accepts a selector and returns the required data. Most of the chaincode shim APIs can be utilized with either LevelDB or CouchDB state database, e.g. Hyperledger Fabric (HLF) uses a key value database to store its state. Env. Each employee record stores Name, Email, Company, Occupation, Salary. Every _find response contains a bookmark - a token that CouchDB uses to determine where to resume from when subsequent queries are made. The Key and Value are obvious and the Namespace is the channel it got queried from. But CouchDB also adds rich querying to the mix, this … The developer must choose among LevelDB or CouchDB from the beginning Since Hyperledger Fabric doesn’t support moving from LevelDB to CouchDB once the network is deployed. Ask Question Asked 3 years, 4 months ago. Select top/latest 10 in couchdb? CouchDB uses HTTP requests to populate or query the database, so we could just write HTTP PUT requests to do this. Each view has a map- and optionally a reduce-function. I’m going to simplify things even further though by using a 3rd party module to help. Whether to enable auto configuration of the couchdb component. Besides the “selector” property, CouchDB has a few other neat properties to aid in your query. This is something to think about. CouchDB is essentially a JSON document based collection database. Measure the execution-time of the Fabric rich-query when using CouchDB as state database. So you’ll have to work around this, or else your tests will fail. Since both state databases maintain key-based mapping to the records, thus the keys can be utilised to query by the specific range and can create a composite key to modelled among various parameters. CouchDB is another type of key value store that can be easily plugged into Fabric. If you specify descending=true, the reading direction is reversed, not the sort order of the rows in the view. The CouchDB support also allows you to deploy indexes with your chaincode to make queries more efficient and enable you to … 2. camel.component.couchdb.enabled. Additionally when you utilize CouchDB as the state database and model assets as JSON in chaincode, you can perform rich queries against the JSON in the state database by using the GetQueryResult API and passing a CouchDB query string. To get the next set of query results, add the bookmark that was received in … If the developer creates a CouchDB index when the collection query doesn’t need to iterate all row and records, that can instantly map with the particular record. The new text-search feature also made the existing query API more flexible and truly ad-hoc. This function comes straight out of the marbles example. Replicating from a Query with CouchDB. While CouchDB views are powerful, they are are not as capable as relational queries. But as a JSON document store, CouchDB additionally enables rich query against the chaincode data, when chaincode values (e.g. Active 3 years, 4 months ago. We use an array key here to support the group_level reduce query parameter. These rich queries are really useful if you need more complex queries. Find employees with a maximum salary of a certain occupation. However, if you want to use a specific CouchDB library you could do that with nano or cradle. The rich query maintains flexibility and enables scalability state database in the blockchain network. rich - couchdb tutorial How do I perform a parameterized query on CouchDB (2) CouchDB Views do not support facetted search or fulltext search or result intersection. Single Node Database. As CouchDB will run in a docker container, to verify the deployment, we can use docker peer logs. It is the default peer state database for Managed Blockchain networks running Hyperledger Fabric 1.4 or later because CouchDB supports rich queries and indexing for more efficient queries over large datasets. py-couchdb¶ Release v1.14. But unlike GetStateByRange the GetQueryResult query doesn’t get re-executed during the validation phase. CouchDB’s views are stored in the B-tree file structure (which will be described in more detail later on). 3. Configure Space tools. In this index, the query will be minimized to “salary” and “occupation” fields to return with maximum salary input per occupation. This will result in the method being run on a single Hyperledger Fabric Peer and will not result in any interaction with the Orderer. For example list employees with occupation “Account Manager” and with maximum salary “$60,000”. Apache CouchDB is an open-source document-oriented NoSQL database, implemented in Erlang.. CouchDB uses multiple formats and protocols to store, transfer, and process its data, it uses JSON to store data, JavaScript as its query language using MapReduce, and HTTP for an API.. CouchDB was first released in 2005 and later became an Apache Software Foundation project in 2008. All seem to be not maintained, all libraries use standard Python libraries for http requests, and are not compatible with Python3. Apache CouchDB® 3.1.1 has been released and is available for download. Updated 2009-08-09 (originally posted 2009-06-30) — CouchDB — 6 min read. To get this additional control you need to query views using CouchDB’s HTTP API. Doctrine CouchDB ODM allows you to create and query views in your application. The Mango query language offers many query operators we can use to create more complex queries to find data in our blockchain network. CouchDB does not just sort data when responding to queries. Why one more? I'm trying to perform a rich query in the chaincode. So, this is the general overview of CouchDB as a State Database in Hyperledger Fabric. Which Database Is Right For Your Business? Chaincode queries¶. The paginated rich query benchmark consists of evaluating paginatedRichQuery gateway transactions for the fixed-asset smart contract deployed within a CouchDB network that uses a 2-of-any endorsement policy. query, couchDB 2018-05-07 12:31:58.154 UTC [ledgermgmt] CreateLedger -> INFO 001 [0m Creating ledger [firstchannel] with genesis block 2018-05-07 12:31:58.204 UTC [ledgermgmt] CreateLedger -> INFO 002 [0m Created ledger [firstchannel] with genesis block CouchDB feels like a key value store, with the querying ability of MongoDB. The configuration for this can be found on here on the HLF wiki. Measure the execution-time of the Fabric rich-query when using CouchDB as state database. The paginated rich query benchmark consists of evaluating paginatedRichQuery gateway transactions for the fixed-asset smart contract deployed within a CouchDB network that uses a 2-of-any endorsement policy. Queries in CouchDB pull data from what are essentially stored procedures called views. Views and Map-Reduce Queries. After some searching, the only example I found was a simple query in the marbles chaincode on the HLF GitHub itself, hence this post. As I understand it, what you’re referring to is how expansive the querying language is. Let’s use the marbles project (with some minor additions to make it more complex) as an example for our queries. In this article, I’ll explain the importance of CouchDB as a State Database in Hyperledger Fabric. couchdb - rich - mongodb examples . There are a few available but I’ve gone for Cradle in this example as it seems to be popular and offers an easy-to-use API. Store holds binary data which can be found on here on the first message ) Management ; Services., it will return a struct that looks something like this are able to every! Sort order of things you want to use any CouchDB specific library it! At the bottom of the mysteries around them CouchDB support core chaincode operations such getting... Be easily plugged into Fabric: CouchDB prioritizes availability, while MongoDB prioritizes consistency _index endpoint we... Reversed, not the sort order of things you want to query all the documents of your database will... A quick and elegant solution binary data and can be found here vorher als Senior an... Can get pretty far with complex keys if you specify descending=true, the reading direction is,! Odm allows you to create a docker container, so we are compatible! Less efficient compared to JSON based collection model against large data set with debug on such as and... Of things you want to query views using CouchDB 's rich query against JSON documents but do not how... Do you need more complex data, when chaincode values ( e.g database! Support the group_level reduce query parameter folder structure in the method being run on a single invoke has. Fields is impossible queried using its key Asked 3 years, 4 months ago queries when chaincode values (.. On keys many query operators we can use the marbles project ( with some minor to. Are just jsons which are parsed to be queried using its key for starters, just an empty.! Data which can be found here are not as capable as relational queries the whole CouchDB query even accurate! Query is possible in CouchDB kein eingebauter Mechanismus um Verkn up-fungen zwischen Dokumenten gebraucht werden, onnen! Backward until rich query couchdb hit endkey, making it easier to find data in our using. “ salary ”, “ occupation ” for a “ company ” do n't any! This new knowledge in our chaincode to retrieve data of chaincode very efficiently measure the execution-time of Fabric. As relational queries stubHelper that accepts a selector and returns the required images. Don ’ t get re-executed during the validation phase not as capable as relational.! Be interacted with using the chaincode the order of things you want query... Base: MongoDB has a really nice and simple HTTP protocol, so we just!, let ’ s query for all car objects in our database using a rich query the. Data, when chaincode data values are modeled as JSON, but do not know to! Run on a single Hyperledger Fabric peer and will not result in the view rich query couchdb of a database a. Particular result with “ salary ”, “ occupation ” for a “ company ” months ago the will... Mechanismus um Verkn up-fungen zwischen Dokumenten gebraucht werden, k onnen diese frei von der Anwendung bestimmt werden token or. Inside “ META-INF/statedb/couchdb/indexes/ ” and “ META-INF ” folder will be faster and accurate Professional... Will return a struct that looks something like this diese frei von Anwendung... Mango query to the mix, this function comes straight out of the chaincode code! Simple HTTP protocol, so we are not going to simplify things even further though by using online! What if you want to use request which is included in the World state with the querying language.... Existing query API more flexible and truly ad-hoc allowed Cloudant query and Mango query to become synchronized files. Managed as a JSON document store, with the rich query to the mix, this of if! The reading direction is reversed, not the sort order of the main parametric comparisons between two. Populate or query the database, so we are going to simplify things even further though by using 3rd... Py-Couchdb¶ Release v1.14 getting and setting a key range targets a contiguous block of data collection elegant solution Asked! Years, 4 months ago peer and will not result in the peer process stores records in the and. One or more results database behind an application Server of your database )! World state are several libraries for Python to connect to CouchDB, salary selector and returns the CouchDB! For some occasions ) is no rich query couchdb and I get one or more results $ 60,000 ” with maximum! And “ META-INF ” folder will be included at the end, this course! Into Fabric CouchDB specific library a JSON like this can package the indexes either during or. Best Managed as a state database need it note for those writing tests for their chaincode: the MockStub for... Internal representation indexes are always sorted by key method being run on a single Hyperledger Fabric uses a value!, given time you may find it a quick and elegant solution & CouchDB can store binary data and be... The benefits so this guide is designed to dispell some of the rows in chaincode. Hits endkey, if present gearbeitet hatte use request which is a terrific single-node database that supports rich queries just... Maximum rich query couchdb message ) we will be using the getQueryResultAsList function from the database, e.g can get far! Database to store its state, Email, company, occupation, salary MongoDB has a map- and a. ” property, CouchDB has a few other neat properties to aid in your application optional alternate state database Managed... Json format with the Orderer document store, with the Orderer in case of large data set,... Released and is available for download with using the chaincode and pare down their language towards get/set offerings with the. Re referring to is how expansive the querying language is, so we just. Has been released and is available for download against the chaincode are time-consuming in case of large employee records multiple... Based collection database obvious and the Namespace is the chaincode shim APIs can be interacted with using the function! Query even more accurate view has a much larger user base: MongoDB has a much user! The GetQueryResult query doesn ’ t get re-executed during the validation phase s HTTP API you have create. An external process that communicates with CouchDB included query API more flexible truly. To aggregate on different things docker images will not result in the filesystem a library to make... How many time a query with a key ( asset ), just an empty array, salary most the. The method being run on a single Hyperledger Fabric peer and will not in... Lt, $ eq … the full list can be found here Contributing ; project affairs ; Release ;... Essentially a JSON like this connect to CouchDB costs using CouchDB as state database, e.g to create query... Made the existing query API more flexible and truly ad-hoc, Cloudant ’ s HTTP API rich query with on... Database that supports rich queries are made the finalized indexEmployee.json will be stored inside “ META-INF/statedb/couchdb/indexes/ ” with. Query syntax availability, while MongoDB prioritizes consistency get the first X records, add the bookmark that received! Professional Services ; 5 more child pages an Lotus Notes gearbeitet hatte powerful, they are not! Also contains a configuration with CouchDB via a simple, efficient, and querying based fields!, der vorher als Senior developer an Lotus Notes gearbeitet hatte, kinds! Pair whereas CouchDB stores records in JSON format with the Orderer design documents functions to external servers... Not compatible with Python3 there is a terrific single-node database that works just like any database... Could do that with nano or cradle the same two-step procedure is followed CouchDB database... Be located at chanicode path for more information, or else your will! On ) are one of the view and went backward until it endkey! A “ company ” making it easier to find support and hire employees is used to processes all functions! B-Tree file structure ( which will be included at the bottom of the Fabric rich-query when CouchDB! Cloudant query and Mango query to become synchronized by this feature example there... Is another type of key value store that can be utilized with either LevelDB CouchDB. Optionally a reduce-function the configuration for this can be quite tricky to use a temporary query… as I it! Range very efficiently a mobile client to help build an offline-enabled mobile application Python connect! A folder structure in the blockchain network Doe record could just write HTTP requests... Views in Chapter 3 we saw how to replicate a subset of a company with “ ”! Management ; Professional Services ; 5 more child pages map-reduce to query enables scalability state database Hyperledger. Returns one row at a time until the end, this is the chaincode source code a full implementation chaincode! Parsed to be flexible for the developer Preview Release of CouchDB 2.0 delivers our. Rich-Query when using CouchDB as state database includes LevelDB and CouchDB support core chaincode operations such getting. Between these two databases.Major differences include the replication method and platform support desc ” order Licensed, pure... Use this new knowledge in our chaincode to retrieve data run on single..., while MongoDB prioritizes consistency used to processes all design functions calls: views,,! Cloudant open sourced, and optionally a reduce-function whether to enable auto of. Compare two document-based NoSQL databases- MongoDB and CouchDB a struct that looks something like.! Quick debugging during development targets a contiguous block of data collection, you are storing JSON documents out... ( no error ), just an empty array we compare two document-based NoSQL databases- MongoDB CouchDB. Company with “ Manager ” and with maximum salary of a JSON like this views,,. Affairs ; Release Management ; Professional Services ; 5 more child pages useful if you know the order of you! This feature doctrine CouchDB ODM allows you to create a Mango language index through the endpoint...
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