CN104994438A - Channel collection method and device and set top box - Google Patents

Abstract

The present invention provides a channel collection method and device, and a set-top box, wherein the method includes: the set-top box acquires the first channel information of digital video broadcasting DVB and the second channel information of OTT and/or interactive network television IPTV; On the page where the first channel information and the second channel information are fused, the set-top box stores the channel corresponding to the specified command under the trigger of the specified command. The above-mentioned technical solution provided by the present invention solves the problem in the related art that there is no technical solution that can realize the business function of collecting channels on the dual-mode set-top box fusion page, thereby improving the adaptability of the set-top box to unused networks and reducing the cost of operation. The cost of the dual-mode set-top box system layout is reduced, and the user experience of using the dual-mode set-top box is also improved.

Description

Channel collection method and device, set-top box

technical field

The present invention relates to the communication field, in particular to a method and device for storing channels, and a set-top box.

Background technique

With the continuous promotion of digital video broadcast system set-top boxes and Internet TV set-top boxes in home terminals, the diversity of set-top box products has been continuously expanded. In order to integrate various types of set-top boxes, a mixed-mode set-top box (also known as a dual-mode set-top box) product is designed to reduce the dependence on multiple set-top boxes and realize that a single set-top box can play video programs from multiple source sources. The mixed-mode set-top box usually mixes two program transmission channels of Internet Protocol (Internet Protocol, referred to as IP) network and digital video broadcasting.

Especially at present, the digital video broadcasting system is still the main role of the TV program providing business, and the live TV broadcast and the premiere of TV dramas are still prioritized on the digital video broadcasting network. The Internet TV set-top box, as a more flexible on-demand viewing method, provides more free program selection and program range. The existing technology does not provide a technical solution for the business functions on the integration page of the modular set-top box, especially the function of collecting channels.

In the related art, there is no technical solution to realize the service function of favorite channels on the integration page of dual-mode set-top boxes, and no effective solution has been proposed yet.

Contents of the invention

In order to solve the above technical problems, the present invention provides a channel storage method and device, and a set-top box.

According to one aspect of the present invention, a method for channel collection is provided, including: a set-top box acquires first channel information of digital video broadcasting DVB and second channel information of OTT and/or interactive network television IPTV; On the page where the information is fused with the second channel information, the set-top box stores the channel corresponding to the specified command under the trigger of the specified command.

Preferably, after storing the channel corresponding to the specified command, the method further includes: the set-top box sending the channel attribute corresponding to the channel that is stored to an electronic program menu EPG server, wherein the EPG server shares the channel attribute To the set-top box or terminal connected to the EPG server.

Preferably, before the set-top box sends the channel attributes corresponding to the favorited channels to the EPG server, the method further includes: the set-top box saves the channel attributes corresponding to the favorited channels in a local database of the set-top box.

Preferably, after bookmarking the channel corresponding to the designated command, the method further includes: the set-top box deleting the bookmarked channel corresponding to the designated command.

Preferably, the page fused with the first channel information and the second channel information is formed by acquiring the first page attribute corresponding to the first channel information and the second page attribute corresponding to the second channel information ; forming the merged page according to the common attributes of the first page attribute and the second page attribute.

According to another aspect of the present invention, a set-top box is also provided, and the set-top box is used for executing any one of the methods described above.

According to another aspect of the present invention, there is also provided a channel collection device, which is applied to a set-top box, including: an acquisition module, used to acquire the first channel information of digital video broadcasting DVB and the first channel information of OTT and/or interactive network television IPTV Two channel information; a collection module, configured to bookmark the channel corresponding to the specified command on the page where the first channel information and the second channel information are fused, triggered by a specified command.

Preferably, the device further includes, further comprising: a sending module, configured to send the channel attribute corresponding to the favorited channel to an electronic program menu EPG server, wherein the EPG server shares the channel attribute with the The set-top box or terminal connected to the EPG server.

Preferably, the device further includes: a saving module, configured to save channel attributes corresponding to the favorite channels to a local database of the set-top box.

Preferably, the device further includes: a deletion module, configured to delete the favorite channel corresponding to the designated command.

Through the present invention, on the page where the first channel information and the second channel information are fused, the set-top box stores the channel corresponding to the specified command under the trigger of the specified command, which solves the problems in the related art. , on the dual-mode set-top box integration page, there is no technical solution to realize the business function of collecting channels, thereby improving the adaptability of the set-top box to unused networks, reducing the operator’s overhead for the dual-mode set-top box system layout, and improving User experience using a dual-mode set-top box.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flow chart of a channel collection method according to an embodiment of the present invention;

FIG. 2 is a structural block diagram of a device for storing channels according to an embodiment of the present invention;

FIG. 3 is another structural block diagram of a device for storing channels according to an embodiment of the present invention;

Fig. 4 is the overall frame diagram of the system according to the preferred embodiment 1 of the present invention;

Fig. 5 is a flow chart of processing logic when the set-top box side enters the channel collection page according to the second preferred embodiment of the present invention;

Fig. 6 is a flow chart of processing logic for performing a channel collection operation on the set-top box side according to the third preferred embodiment of the present invention;

FIG. 7 is a flow chart of processing logic for displaying IPTV/OTT channel favorite attributes on the other terminal side according to the fourth preferred embodiment of the present invention;

Fig. 8 is a flow chart of processing logic for performing an IPTV/OTT channel bookmarking operation on the other terminal side according to the fifth preferred embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

In an embodiment of the present invention, a method for storing channels is also provided. FIG. 1 is a flowchart of a method for storing channels according to an embodiment of the present invention. As shown in FIG. 1 , it includes the following steps:

Step S102, the set-top box obtains the first channel information of digital video broadcasting DVB and the second channel information of OTT and/or interactive network television IPTV;

Step S104 , on the page where the above-mentioned first channel information and the above-mentioned second channel information are fused, the set-top box stores the channel corresponding to the specified command under the trigger of the specified command.

Through the above steps, on the page where the information of the first channel and the information of the second channel are fused, the set-top box is triggered by a specified command to store the channel corresponding to the specified command. On the integration page, there is no technical solution to realize the business function of collecting channels, thereby improving the adaptability of the set-top box to different networks, reducing the operator's overhead for the dual-mode set-top box system layout, and also improving the use of dual-mode set-top boxes. User experience, effectively realizing the integration of program information and services (collection function) in different modes.

After performing the above steps S102 and S104, in the embodiment of the present invention, the following scheme can also be implemented: the set-top box sends the channel attributes corresponding to the favorite channels to the EPG server, wherein the EPG server shares the channel attributes with the EPG server The connected set-top box or terminal, that is to say, after the set-top box sends the favorite channel attributes to the EPG server, as long as it can connect to the EPG server through a network connection, then the set-top box or terminal connected to the EPG server can share the favorite channels on the EPG server. Of course, the channel attributes stored on the EPG server may also be uploaded by the terminal to the EPG server through a network connection, which is not limited in this embodiment of the present invention.

Of course, it should be noted that before the set-top box sends the channel attributes corresponding to the favorited channels to the EPG server, the following process may also be performed: the set-top box saves the channel attributes corresponding to the favorited channels to the local database of the set-top box.

The set-top box can store the channel corresponding to the specified command, and correspondingly, the set-top box deletes the stored channel corresponding to the specified command.

In the embodiment of the present invention, the page fused with the first channel information and the second channel information is formed in the following manner: obtain the first page attribute corresponding to the first channel information and the second page attribute corresponding to the second channel information; The common attributes of the page attributes and the second page attributes form a fused page.

The above-mentioned process of merging pages can also be embodied by the following technical solutions: the set-top box obtains the first page attribute of the local page, and the second page attribute of the OTT/IPTV server page; according to the common attribute fusion of the first page attribute and the second page attribute The local page and the OTT/IPTV server page, that is, the common page attributes of the DVB local page and the OTT/IPTV server page are combined to form a new integrated interface. If there are non-shared page attributes, you can discard them and not display them. If you still want to watch For the content displayed by the non-shared page properties, you can switch from the current page to the corresponding page to view these non-shared page properties in detail.

In another optional example of the embodiment of the present invention, a set-top box is further provided, and the set-top box is used for performing any one of the methods above.

In order to better understand the above-mentioned channel collection process, an example is briefly described below. The method for performing service integration on a set-top box provided by the above-mentioned embodiment of the present invention realizes service integration of sharing channel collection functions on multiple terminals. The main technical scheme of the embodiment of the present invention mainly includes the following steps:

Step A: The digital video broadcasting and IPTV systems on the system side do not require special devices or special operations. The channel information of the two systems (digital video broadcasting and IPTV systems) are respectively received and acquired on the set-top box, and the channels of the two systems are connected to each other. Shuffle operations are displayed to users in a unified format.

Step B: The user triggers the favorite adding/deleting operation of the relevant channel on the channel display page of the set-top box, that is, the specified command in the above embodiment can be reflected in the case of user triggering.

Step C: the set-top box fusion module in the set-top box judges whether the channel is a DVB channel or an IPTV/OTT (Internet TV) channel, if the DVB channel directly caches the collection attribute data of this channel in the local database, if it is an IPTV/OTT (Internet TV) channel In addition to the favorite attribute data of the channel cached in the local database, it is also necessary to send a request to add/delete the favorite attribute of the channel to the IPTV/OTT system side (equivalent to the EPG server of the above-mentioned embodiment). Indicates whether to bookmark the channel corresponding to the collection attribute data.

Of course, if the user has set the favorite attributes of DVB channels to be synchronized among multiple home set-top boxes, it is also necessary to send the favorite attributes of DVB channels to the IPTV/OTT system side so as to synchronize the favorite attributes of the DVB channels on other set-top boxes.

Step D: The IPTV/OTT system side module executes the business logic processing of adding/deleting the relevant channel collection attribute, and returns the result to the set-top box client after the execution is completed.

It should be noted that if other home terminals: PC, Phone, and Pad can be connected to the IPTV/OTT system side, when the user plays an Internet TV channel, the relevant channel collection attribute data will be obtained and displayed to the user, realizing the function of sharing channel collection among multiple terminals .

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In this embodiment, a device for storing channels is also provided, which is applied to a set-top box and is used to implement the above-mentioned embodiments and preferred implementation modes. What has already been described will not be described in detail. The modules involved in the device will be described below . As used below, the term "module" may be a combination of software and/or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated. Fig. 2 is a structural block diagram of a device for storing channels according to an embodiment of the present invention. As shown in Figure 2, the device includes:

The obtaining module 20 is used to obtain the first channel information of digital video broadcasting DVB and the second channel information of OTT and/or interactive network television IPTV;

The favorite module 22 is connected with the acquisition module 20, and is used for saving the channel corresponding to the specified command under the trigger of the specified command on the page where the first channel information and the second channel information are fused.

Through the comprehensive function of the above-mentioned various modules, on the page where the information of the first channel and the information of the second channel are fused, the set-top box is triggered by a specified command, and the technical means of storing the channel corresponding to the specified command is adopted, which solves the problem of On the dual-mode set-top box integration page, there is no technical solution to realize the business function of collecting channels, thereby improving the adaptability of the set-top box to unused networks, reducing the operator’s overhead for the dual-mode set-top box system layout, and improving the use of dual-mode set-top boxes. The user experience of the model set-top box has effectively realized the integration of program information and services (collection function) in different modes.

Fig. 3 is another structural block diagram of the channel collection device according to the embodiment of the present invention, as shown in Fig. 3, the above-mentioned channel collection device also includes: a sending module 24, connected with the collection module 22, for channel corresponding to the channel of the collection The attribute is sent to the electronic program menu EPG server, wherein the EPG server shares the channel attribute to the set-top box or terminal connected to the EPG server, that is to say, after the set-top box sends the favorite channel attribute to the EPG server, as long as it can be connected through the network Connect to the EPG server, then the set-top boxes or terminals connected to the EPG server can share the channel attributes stored on the EPG server. Of course, the channel attributes stored on the EPG server can also be uploaded to the EPG server by the terminal through a network connection. The present invention The embodiment does not limit this.

In order to further improve the above-mentioned technical solution, as shown in Figure 3, the above-mentioned device also includes: a preservation module 26, which is connected with the sending module 24, and is used to save the channel attributes corresponding to the favorite channels to the local database of the set-top box, and may also include : the delete module 28, connected with the save module 26, is used to delete the favorite channel corresponding to the designated command.

In order to better understand the above device for storing channels, an example will be used below for description.

In the actual application process, the modules involved in the set-top box: DVB channel information analysis module (equivalent to the acquisition module 20), IPTV/OTT channel reception module (equivalent to the acquisition module 20), business integration processing module, page display module, business logic processing module.

The DVB channel information analysis module is used to analyze the DVB channel information in the code stream and report the information to the service integration processing module.

The IPTV/OTT channel receiving module is used to receive the channel delivered by the IPTV/OTT system side and report it to the service integration processing module.

The business integration processing module is used to mix the channels of the two systems, and obtain them in a unified format for the page display module. The business integration processing module handles the business logic of all channel collection operations, executes local database operations, and caches channel collection attribute data for page acquisition. If the channel is an IPTV/OTT channel, it also processes the interaction logic with the IPTV/OTT system side module. It is the core module for the set-top box to realize the channel collection function.

The page display module and the business integration processing module interactively display the favorite attributes of the channel, and the page display module is used to display the favorite attribute data of the channel on the application.

Modules involved in other home terminals: page display module, business logic processing module.

The business logic processing module is used to interact with the IPTV/OTT system side, and save the favorite attribute data of the IPTV/OTT channel to the database on the system side.

The above-mentioned technical solution of the embodiment of the present invention realizes the business integration of the two systems of the DVB system and the IPTV/OTT system on the terminal, realizes the channel collection function of the two systems, and realizes sharing between multiple screens for the channels of the IPTV/OTT system Channel Favorites feature.

The above technical solution will be further explained below in conjunction with preferred embodiment 1 to preferred embodiment 5.

Preferred embodiment one

Fig. 4 is the overall frame diagram of the system according to preferred embodiment 1 of the present invention, as shown in Fig. 4, comprises: DVB head-end system 40, IPTV/OTT system side service processing logic module 42, set-top box local service database 44, IP network 46 , IPTV/OTT system side database 48.

Among them, the set-top box saves the DVB channel delivered by the DVB head-end system 40 and the IPTV/OTT channel delivered by the IPTV/OTT system side service processing logic module 42 in a unified format to the local service database 44 of the set-top box. The collection attribute data of non-IPTV/OTT channels is stored in the set-top box local service database 44, and the collection attribute data of IPTV/OTT channels is not only stored in the set-top box local service database 44, but also needs to pass through the IP network 46 and the IPTV/OTT system side service processing logic module 42 Save the data interactively to the database 48 on the IPTV/OTT system side. Other terminal applications interact with the IPTV/OTT system-side business processing logic module 42 through the IP network 46 to realize functions such as display, addition, and deletion of IPTV/OTT channel collection attribute data.

Preferred embodiment two

Fig. 5 is a flow chart of processing logic when the set-top box side enters the channel collection page according to the second preferred embodiment of the present invention, as shown in Fig. 5 , including the following steps:

Step S502: Enter the channel collection page, and notify the TV local business logic processing module;

Step S504: Send a request to the IPTV/OTT system server for caching the favorite attributes of the IPTV/OTT channel, cache the relevant data to the local database, and notify the page after the caching is completed;

Step S506: return all IPTV/OTT channel favorite attribute data;

Step S508: same as step S504;

Step S510: display the favorite attributes of all channels, including DVB channels and IPTV/OTT channels.

The above steps can be roughly summarized as follows: on the set-top box side, when the user enters the channel collection page, the template page module will trigger the business logic processing module of the set-top box to interact with the IPTV/OTT system side, and cache the collection attribute data of the IPTV/OTT channel to the local The database is then displayed to the page. The channel favorite attribute data stored in the local database after caching includes not only related channels originally operated on the set-top box but also related IPTV/OTT channels operated on other home terminals (PC, Phone, Pad).

Preferred Embodiment Three

Fig. 6 is a flow chart of processing logic for performing a channel collection operation on the set-top box side according to the third preferred embodiment of the present invention. As shown in Fig. 6, it includes the following steps:

Step S602: the template page module triggers the action of adding/deleting channel favorites;

Step S604: determine whether the channel attribute is an IPTV/OTT channel;

Step S606: processing adding/deleting IPTV/OTT channels and collecting attribute logic returns the processing result;

Step S608: same as step S504;

Step S610: Read the local database to display the favorite attributes of all channels.

The above technical solution can be understood through the following process: on the set-top box side, when the user triggers the operation of adding or deleting the collection attribute data of the channel on the page display module, the page display module will call the service of the TV local business logic processing module. The business logic processing module will first judge the channel attribute. If it is a DVB channel, directly save the collection attribute data of the channel to the local database. If it is an IPTV/OTT channel, in addition to saving it to the local database, the business logic processing module also needs to communicate with the IPTV/OTT system. side interaction, save the favorite attribute of the IPTV/OTT channel to the system side database, and share the favorite attribute of the channel with other terminals. If the user needs to synchronize the collection attributes of DVB live channels among multiple set-top boxes at home, it is necessary to send the relevant DVB channel collection attributes to the IPTV/OTT system side and cache them on the system service side so that they can be displayed on other set-top boxes Collection properties of DVB channels.

Preferred Embodiment Four

Fig. 7 is a flow chart of processing logic for displaying IPTV/OTT channel collection attributes on other terminal sides according to preferred embodiment 4 of the present invention, as shown in Fig. 7 , including the following steps:

Step S702: Enter the application and request the IPTV/OTT system side to obtain the collection attribute of the live channel;

Step S704: return the collection attribute data of all IPTV/OTT live channels to the client;

Step S706: Display the collection attribute data of the IPTV/OTT live channel.

The above technical solution can be understood as: in the application of other home terminals, mainly interact with the IPTV/OTT system side through the IP network to realize functions such as playing and ordering of IPTV/OTT channels. When entering the application, it is necessary to display the favorite attributes of the channel, and the business logic processing module of the application will interact with the system side to obtain the favorite attribute data of the relevant IPTV/OTT channels operated on all terminals.

Preferred Embodiment Five

Fig. 8 is a flow chart of processing logic for performing an IPTV/OTT channel collection operation on the other terminal side according to the fifth preferred embodiment of the present invention, as shown in Fig. 8, including the following steps:

Step S802: triggering the action of adding/deleting favorite attribute data of IPTV/OTT channels on the uplink of the terminal and directly sending a logic processing request to the system side;

Step S804: process the add/delete channel favorite attribute logic according to the terminal request, and return the processing result to the terminal;

Step S806: According to the processing result on the system side, display the collection attribute data of all live channels of the current IPTV/OTT.

The above technical solution can be understood as: in other home terminal applications, when the user triggers the channel’s favorite addition or deletion operation, the business logic processing module of the application will interact with the system side to save the favorite attribute data of the IPTV/OTT channel to the IPTV/OTT channel. In the OTT system side database, so that when the user uses the set-top box again, the channel collection operation performed on these terminals can be shared.

In summary, the embodiment of the present invention achieves the following technical effects: solves the problem in the related art that there is no technical solution to realize the business function of collecting channels on the dual-mode set-top box fusion page, and further improves the set-top box’s ability to use the network without the network. The adaptability reduces the operator's overhead for the dual-mode set-top box system layout, and also improves the user experience of using the dual-mode set-top box.

In another embodiment, software is also provided, and the software is used to implement the technical solutions described in the above embodiments and preferred implementation manners.

In another embodiment, there is also provided a storage medium, in which the software is stored, the storage medium includes but not limited to: optical discs, floppy disks, hard disks, rewritable memories, and the like.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a channel collecting method, is characterized in that, comprising:

Set Top Box obtains first channel information of digital video broadcasting DVB and second channel information of OTT and/or IPTV IPTV;

On the page that described first channel information and described second channel information merge, Set Top Box, under the triggering of specified command, collects the channel corresponding with described specified command.

2. method according to claim 1, is characterized in that, after collecting the channel corresponding with described specified command, also comprises:

Channel attribute corresponding for the described channel of collection is sent to EPG server by described Set Top Box, and wherein, described channel attribute is shared to the Set Top Box or terminal that are connected with this EPG server by described EPG server.

3. method according to claim 2, is characterized in that, described Set Top Box also comprises before channel attribute corresponding for the described channel of collection is sent to EPG server:

Channel attribute corresponding for the described channel of collection is saved to the local data base of this Set Top Box by described Set Top Box.

4. method according to claim 1, is characterized in that, after collecting the channel corresponding with described specified command, also comprises:

Described Set Top Box deletes the channel corresponding with described specified command of described collection.

5. the method according to any one of Claims 1-4, is characterized in that, forms the page of described first channel information and described second channel information fusion in the following manner:

Obtain first page attribute corresponding to described first channel information and the second page properties corresponding to described second channel information;

The page of described fusion is formed according to the total attribute in described first page attribute and described second page properties.

6. a Set Top Box, is characterized in that, described Set Top Box is used for the method described in any one of enforcement of rights requirement 1-5.

7. a channel collecting device, is applied to Set Top Box, it is characterized in that, comprising:

Acquisition module, for the second channel information of the first channel information and OTT and/or IPTV IPTV that obtain digital video broadcasting DVB;

Collection module, for the page merged at described first channel information and described second channel information, under the triggering of specified command, collects the channel corresponding with described specified command.

8. device according to claim 7, is characterized in that, described device also comprises, and also comprises:

Sending module, for channel attribute corresponding for the described channel of collection is sent to EPG server, wherein, described channel attribute is shared to the Set Top Box or terminal that are connected with this EPG server by described EPG server.

9. device according to claim 8, is characterized in that, described device, also comprises:

Preserve module, for channel attribute corresponding for the described channel of collection being saved to the local data base of this Set Top Box.

10. device according to claim 7, is characterized in that, described device, also comprises:

Removing module, for deleting the channel corresponding with described specified command of described collection.