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源代码存取限制与产品开发周期滞后是商业OPAC的两个固有局限。它们与个性化、动态的OPAC功能需求形成了一对鲜明的矛盾。功能扩展是图书馆解决这对矛盾的有效途径,常见的扩展模式包括丰富检索手段、提供检索辅助工具、优化信息揭示、提供索书帮助、集成电子资源、嵌入资源推介。以富客户端编程突破服务器端开发限制是处于矛盾下OPAC功能拓展的技术特征。在新的发现系统还未完全代替OPAC之前,功能扩展仍然是图书馆改善读者资源查找体验的一种有效方式。
The limitations of source code access and product development lag are two inherent limitations of commercial OPAC. They form a sharp contradiction with the personalized and dynamic OPAC functional requirements. Function expansion is an effective way for libraries to solve these contradictions. Common extension modes include enriching search means, providing search aids, optimizing information disclosure, providing call help, integrating electronic resources, and embedding resource promotion. Using rich client programming to break server-side development constraints is a technical feature of OPAC’s feature expansion. Before the new discovery system completely replaced OPAC, the expansion of functionality remained an effective way for libraries to improve the reader’s resource search experience.