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It facilitates search of information, data analysis and data sharing.

On the other hand, the semantic web is the evolution of the Internet from a web of pages to a web of data. Governments and organizations boost initiatives and legislations to assure universal access. Software accessibility is a current field of interest. Experimental results demonstrate that the method can effectively extract interactive semantic information and simulate the interactive process, and the generated picture previews are of great help to the users to understand the content of IERs. We apply this method to a dynamic geometry platform, NetPad, and conduct experiments.

Secondly, we execute the operation sequence using an automated software tool to mimic the interaction process between the user and the resource and save the screenshots in the process to generate a picture preview of an IER. Firstly, we analyze the file that stores interactive resource information, obtain the interactive elements’ information, extract the dependencies, and generate an operation sequence. Therefore, in this paper, we propose a method for generating picture previews of IERs. Only when the users perform interactive operations correctly can they acquire the knowledge conveyed by the resources, which makes it a challenge to help the users understand the general content of resources and find the resources that they are interested in. Compared with the traditional resources, the interactive educational resources (IERs) have hidden interactive information and dynamic content. With the development of network technology, many online educational resource platforms have emerged, and the number of resources on these platforms is increasing dramatically. is proves that the picture previews generated by our proposed method can represent most of the content of mathematical educational resources.

position(top) from low to high (19) end if (20) end for (21) return operateList ALGORITHM 4: GetOperateList (E, DR, elementToPri).

position(left)from low to high (18) array operateList by e i.

type �� visible & interactive do (2) operate List.append(e i ) (3) end for (4) array operateList by elementToPri from high to low (5) for 〈e i, e j 〉 ∈ DR do (6) if e i, e j in operate List and element ToPri(e j ) �� element Topri(e i ) (7) if e j is behind e i in operateList (8) for e k in front of e j and e k behind e i do (9) put e k in operate List position index(e k ) + 1 (10) end for (11) put e j in operate List position index(e i ) (12) end if (13) end if (14) end for (15) for e i in operate List do (16) if e i is a button (17) array operateList by e i elements set E dependencies set DR elements to priorities mapping elementToPri Output: operateList (1) for e i ∈ E and e i.