（）是指工程项目或贸易项下招标时，银行应投标人的申请向招标人出具的一种担保，担保投标人在开标前不中途撤标，中标以后不拒绝签约和不拒绝交付履约金，否则担保银行将按保函金额对招标人进行赔偿。

A．履约保函

B．投标保函

C．付款保函

D．预付款保函

SOX is an alternative（1）for XML.It is useful for reading and creating XML content in a（2）.editor.It is then easily transformed into proper XML.SOX was created because developers can spend a great deal oftime with raw XML.For many ofus,thepopular XML（3）have not reached a point where their tree views,tables and forms can completely substitute for the underlying（4）languagE.This is not surprising when one considers that developers still use a text view,albeit enhanced,for editing other languages such as Java）SOX uses（5）to represent the structure of an XML document,which eliminates the need for closing tags and a number of quoting devices.The result is surprisingly clear.

空白（1）处应选择（）

A.semantic

B.pragmatics

C.syntax

D.grammar