save bytes on memory instead of string

1 files changed, 4 insertions, 0 deletions

diff --git a/templates.go b/templates.go
index b5f4f8c..d3f82ee 100644
--- a/templates.go
+++ b/templates.go
@@ -6,6 +6,10 @@ package excelize
 // XMLHeader define an XML declaration can also contain a standalone declaration.
 const XMLHeader = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n"
 
+var (
+	XMLHeaderByte = []byte(XMLHeader)
+)
+
 const templateDocpropsApp = `<Properties xmlns="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties" xmlns:vt="http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"><TotalTime>0</TotalTime><Application>Golang Excelize</Application></Properties>`
 
 const templateContentTypes = `<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types"><Override PartName="/xl/theme/theme1.xml" ContentType="application/vnd.openxmlformats-officedocument.theme+xml"/><Override PartName="/xl/styles.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml"/><Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/><Default Extension="xml" ContentType="application/xml"/><Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/><Override PartName="/docProps/app.xml" ContentType="application/vnd.openxmlformats-officedocument.extended-properties+xml"/><Override PartName="/xl/worksheets/sheet1.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/><Override PartName="/docProps/core.xml" ContentType="application/vnd.openxmlformats-package.core-properties+xml"/></Types>`